Access List Commands

This module describes the Cisco IOS XR software commands used to configure IP Version 4 (IPv4) and IP Version 6 (IPv6) access lists.

For detailed information about ACL concepts, configuration tasks, and examples, refer to the IP Addresses and Services Configuration Guide for Cisco 8000 Series Routers.

clear access-list ipv4

To clear IPv4 access list counters, use the clear access-list ipv4 command in XR EXEC mode.

clear access-list ipv4 access-list-name hardware {clear access-list ipv4 access-list-name hardware { ingress | egress } [ interface interface-path-id ] [ sequence sequence-number ] [ location node-id] }

Syntax Description

access-list-name

Name of a particular IPv4 access list. The name cannot contain a spaces or quotation marks, but can include numbers.

sequence-number

(Optional) Specific sequence number with which counters are cleared for an access list. Range is 1 to 2147483644.

ingress

Specifies an inbound direction.

egress

Specifies an outbound direction.

interface-path-id

Physical interface or virtual interface.

Note

 

Use the show interfaces command to see a list of all interfaces currently configured on the router.

For more information about the syntax for the router, use the question mark (?) online help function.

location node-id

(Optional) Clears hardware resource counters from the designated node. The node-id argument is entered in the rack/slot/module notation.

Command Default

The default clears the specified IPv4 access list.

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 7.0.12

This command was introduced.

Usage Guidelines

Use the clear access-list ipv4 command to clear counters for a specified configured access list. Use a sequence number to clear counters for an access list with a specific sequence number.

Use an asterisk ( *) in place of the access-list-name argument to clear all access lists.

Task ID

Task ID

Operations

basic-services

read, write

acl

read, write

bgp

read, write, execute

Examples

In the following example, counters for an access list named marketing are cleared: 



Router# show access-lists ipv4 marketing hardware ingress location 0/RP0/CPU0
ipv4 access-list marketing
10 permit ipv4 192.168.34.0 0.0.0.255 any
20 permit ipv4 172.16.0.0 0.0.255.255 any
30 deny tcp host 172.16.0.0 eq 2330 host 192.168.202.203 (23345 matches)

Router# clear access-list ipv4 marketing hardware ingress location 0/RP0/CPU0

clear access-list ipv6

To clear IPv6 access list counters, use the clear access-list ipv6 command in .

clear access-list ipv4 access-list-name hardware { ingress | egress } [ interface interface-path-id ] [ sequence sequence-number ] [ location node-id]

Syntax Description

access-list-name

Name of a particular IPv6 access list. The name cannot contain a spaces or quotation marks, but can include numbers.

sequence-number

(Optional) Specific sequence number for a particular access control entry (ACE) with which counters are cleared for an access list. Range is 1 to 2147483644.

ingress

(Optional) Specifies an inbound direction.

egress

(Optional) Specifies an outbound direction.

interface-path-id

Physical interface or virtual interface.

Note

 

Use the show interfaces command to see a list of all interfaces currently configured on the router.

For more information about the syntax for the router, use the question mark (?) online help function.

location node-id

(Optional) Clears counters for an access list enabled on a card interface. The node-id argument is entered in the rack/slot/module notation.

Command Default

The default clears the specified IPv6 access list.

Command Modes

Command History

Release

Modification

Release 7.0.12

This command was introduced.

Usage Guidelines

The clear access-list ipv6 command is similar to the clear access-list ipv4 command, except that it is IPv6-specific.

Use the clear access-list ipv6 command to clear counters for a specified configured access list. Use a sequence number to clear counters for an access list with a specific sequence number

Use an asterisk (*) in place of the access-list-name argument to clear all access lists.

Task ID

Task ID

Operations

basic-services

read, write

acl

read, write

network

read, write

Examples

In the following example, counters for an access list named marketing are cleared: 



Router# show access-lists ipv6 marketing hardware ingress location 0/RP0/CPU0
ipv6 access-list marketing
  10 permit ipv6 3333:1:2:3::/64 any 
  20 permit ipv6 4444:1:2:3::/64 any 
  30 permit ipv6 5555:1:2:3::/64 any 
Router# clear access-list ipv6 marketing hardware ingress location 0/RP0/CPU0

copy access-list ipv4

To create a copy of an existing IPv4 access list, use the copy access-list ipv4 command in XR EXEC mode.

copy access-list ipv4 source-acl destination-acl

Syntax Description

source-acl

Name of the access list to be copied.

destination-acl

Name of the destination access list where the contents of the source-acl argument is copied.

Command Default

None

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 7.0.12

This command was introduced.

Usage Guidelines

Use the copy access-list ipv4 command to copy a configured access list. Use the source-acl argument to specify the access list to be copied and the destination-acl argument to specify where to copy the contents of the source access list. The destination-acl argument must be a unique name; if the destination-acl argument name exists for an access list or prefix list, the access list is not copied. The copy access-list ipv4 command checks that the source access list exists then checks the existing list names to prevent overwriting existing access lists or prefix lists.

Task ID

Task ID

Operations

acl

read, write

filesystem

execute

Examples

In the following example, a copy of access list list-1 is created: 



Router# show access-lists ipv4 list-1

ipv4 access-list list-1
  10 permit tcp any any log
  20 permit ip any any
Router# copy access-list ipv4 list-1 list-2
Router# show access-lists ipv4 list-2
ipv4 access-list list-2
  10 permit tcp any any log
  20 permit ip any any

In the following example, copying the access list list-1 to list-3 is denied because a list-3 access list already exists: 



Router# copy access-list ipv4 list-1 list-3

list-3 exists in access-list

Router# show access-lists ipv4 list-3

ipv4 access-list list-3
  10 permit ip any any 
  20 deny tcp any any log

copy access-list ipv6

To create a copy of an existing IPv6 access list, use the copy access-list ipv6 command in .

copy access-list ipv6 source-acl destination-acl

Syntax Description

source-acl

Name of the access list to be copied.

destination-acl

Destination access list where the contents of the source-acl argument is copied.

Command Default

No default behavior or value

Command Modes

Command History

Release

Modification

Release 7.0.12

This command was introduced.

Usage Guidelines

Use the copy access-list ipv6 command to copy a configured access list. Use the source-acl argument to specify the access list to be copied and the destination-acl argument to specify where to copy the contents of the source access list. The destination-acl argument must be a unique name; if the destination-acl argument name exists for an access list or prefix list, the access list is not copied. The copy access-list ipv6 command checks that the source access list exists then checks the existing list names to prevent overwriting existing access lists or prefix lists.

Task ID

Task ID

Operations

acl

read, write

filesystem

execute

Examples

In this example, a copy of access list list-1 is created: 



Router# show access-lists ipv6 list-1

ipv6 access-list list-1
  10 permit tcp any any log
  20 permit ipv6 any any

Router# copy access-list ipv6 list-1 list-2

Router# show access-lists ipv6 list-2

ipv6 access-list list-2
  10 permit tcp any any log
  20 permit ipv6 any any

In this example, copying access list list-1 to list-3 is denied because a list-3 access list already exists: 



Router# copy access-list ipv6 list-1 list-3

list-3 exists in access-list

Router# show access-lists ipv6 list-3
ipv6 access-list list-3
  10 permit ipv6 any any 
  20 deny tcp any any log

deny (IPv4)

To set conditions for an IPv4 access list, use the deny command in access list configuration mode. There are two versions of the deny command: deny (source), deny (destination), and deny (protocol). To remove a condition from an access list, use the no form of this command.

[ sequence-number ] deny source [ source-wildcard ] [ log | | | log-input ]

[ sequence-number ] deny protocol source source-wildcard destination destination-wildcard [ precedence precedence ] [ dscp dscp [ bitmask value ] ] [ fragments ] [ packet-length operator packet-length value ] [ log | log-input ]

no sequence-number

Internet Control Message Protocol (ICMP)

[ sequence-number] deny icmp source source-wildcard destination destination-wildcard [icmp-type] [icmp-code] [precedence precedence] [dscp dscp] [fragments] [log] [icmp-off]

Transmission Control Protocol (TCP)

[sequence-number] permit tcp { source-ipv4-prefix/ prefix-length | any | host source-ipv4-address ipv4-wildcard-mask/prefix-length } [ operator { port | protocol-port } ] { destination-ipv4-prefix/ prefix-length | any | host destination-ipv4-address ipv4-wildcard-mask/prefix-length } [ operator { port | protocol | port } ] [ dscp value ] [ routing ] [ hop-by-hop ] [ authen ] [ destopts ] [ fragments ] [ established ] { match-any | match-all | + | - } [ flag-name ] [ log ]

Internet Group Management Protocol (IGMP)

[ sequence-number] deny igmp source source-wildcard destination destination-wildcard [igmp-type] [precedence precedence] [dscp value] [fragments] [log]

User Datagram Protocol (UDP)

[ sequence-number] deny udp source source-wildcard [operator {port | protocol-port}] destination destination-wildcard [operator {port | protocol-port}] [precedence precedence] [dscp dscp] [fragments] [log]

Syntax Description

sequence-number

(Optional) Number of the deny statement in the access list. This number determines the order of the statements in the access list. The number can be from 1 to 2147483644. (By default, the first statement is number 10, and the subsequent statements are incremented by 10.)

source

Number of the network or host from which the packet is being sent. There are three alternative ways to specify the source:

  • Use a 32-bit quantity in four-part dotted-decimal format.

  • Use the any keyword as an abbreviation for a source and source-wildcard of 0.0.0.0 255.255.255.255.

  • Use the host source combination as an abbreviation for a source and source-wildcard of source 0.0.0.0.

source-wildcard

Wildcard bits to be applied to the source. There are three alternative ways to specify the source wildcard:

  • Use a 32-bit quantity in four-part dotted-decimal format. Place ones in the bit positions you want to ignore.

  • Use the any keyword as an abbreviation for a source and source-wildcard of 0.0.0.0 255.255.255.255.

  • Use the host source combination as an abbreviation for a source and source-wildcard of source 0.0.0.0.

protocol

Name or number of an IP protocol. It can be one of the keywords ahp , esp , gre , icmp , igmp , igrp , ip , ipinip , nos , ospf , pim , pcp , tcp , or udp , or an integer from 0 to 255 representing an IP protocol number. To match any Internet protocol (including ICMP, TCP, and UDP), use the ip keyword. ICMP, and TCP allow further qualifiers, which are described later in this table.

Note

 

Filtering on AHP protocol is not supported.

destination

Number of the network or host to which the packet is being sent. There are three alternative ways to specify the destination:

  • Use a 32-bit quantity in four-part dotted-decimal format.

  • Use the any keyword as an abbreviation for the destination and destination-wildcard of 0.0.0.0 255.255.255.255.

  • Use the host destination combination as an abbreviation for a destination and destination-wildcard of destination 0.0.0.0.

destination-wildcard

Wildcard bits to be applied to the destination. There are three alternative ways to specify the destination wildcard:

  • Use a 32-bit quantity in four-part dotted-decimal format. Place ones in the bit positions you want to ignore.
  • Use the any keyword as an abbreviation for a destination and destination-wildcard of 0.0.0.0 255.255.255.255.
  • Use the host destination combination as an abbreviation for a destination and destination-wildcard of destination 0.0.0.0.

precedence precedence

(Optional) Packets can be filtered by precedence level (as specified by a number from 0 to 7) or by the following names:

  • routine —Match packets with routine precedence (0)
  • priority —Match packets with priority precedence (1)
  • immediate —Match packets with immediate precedence (2)
  • flash —Match packets with flash precedence (3)
  • flash-override —Match packets with flash override precedence (4)
  • critical —Match packets with critical precedence (5)
  • internet —Match packets with internetwork control precedence (6)
  • network —Match packets with network control precedence (7)

dscp dscp

(Optional) Differentiated services code point (DSCP) provides quality of service control. The values for dscp are as follows:

  • 0–63–Differentiated services codepoint value
  • af11—Match packets with AF11 dscp (001010)
  • af12—Match packets with AF12 dscp (001100)
  • af13—Match packets with AF13 dscp (001110)
  • af21—Match packets with AF21 dscp (010010)
  • af22—Match packets with AF22 dscp (010100)
  • af23—Match packets with AF23 dscp (010110)
  • af31—Match packets with AF31 dscp (011010)
  • af32—Match packets with AF32 dscp (011100)
  • af33—Match packets with AF33 dscp (011110)
  • af41—Match packets with AF41 dscp (100010)
  • af42—Match packets with AF42 dscp (100100)
  • af43—Match packets with AF43 dscp (100110)
  • cs1—Match packets with CS1 (precedence 1) dscp (001000)
  • cs2—Match packets with CS2 (precedence 2) dscp (010000)
  • cs3—Match packets with CS3 (precedence 3) dscp (011000)
  • cs4—Match packets with CS4 (precedence 4) dscp (100000)
  • cs5—Match packets with CS5 (precedence 5) dscp (101000)
  • cs6—Match packets with CS6 (precedence 6) dscp (110000)
  • cs7—Match packets with CS7 (precedence 7) dscp (111000)
  • default—Default DSCP (000000)
  • ef—Match packets with EF dscp (101110)

fragments

(Optional) Causes the software to examine fragments of IPv4 packets when applying this access list entry. When this keyword is specified, fragments are subject to the access list entry.

log

(Optional) Causes an informational logging message about the packet that matches the entry to be sent to the console. (The level of messages logged to the console is controlled by the logging console command.)

Note

 

ACL logging is supported only in ingress direction for both IPv4 and IPv6.

The message includes the access list number, whether the packet was permitted or denied; the protocol, whether it was TCP, UDP, ICMP, or a number; and, if appropriate, the source and destination addresses and source and destination port numbers. The message is generated for the first packet that matches a flow, and then at 5-minute intervals, including the number of packets permitted or denied in the prior 5-minute interval.

log-input

(Optional) Provides the same function as the log keyword, except that the log-message also includes the input interface.

icmp-off

(Optional) Turns off ICMP generation for denied packets.

icmp-type

(Optional) ICMP message type for filtering ICMP packets. Range is from 0 to 255.

icmp-code

(Optional) ICMP message code for filtering ICMP packets. Range is from 0 to 255.

igmp-type

(Optional) IGMP message type (0 to 15) or message name for filtering IGMP packets, as follows:

  • dvmrp
  • host-query
  • host-report
  • mtrace
  • mtrace-response
  • pim
  • precedence
  • trace
  • v2-leave
  • v2-report
  • v3-report

operator

(Optional) Operator is used to compare source or destination ports. Possible operands are lt (less than), gt (greater than), eq (equal), neq (not equal), and range (inclusive range).

If the operator is positioned after the source and source-wildcard values, it must match the source port.

If the operator is positioned after the destination and destination-wildcard values, it must match the destination port.

The range operator requires two port numbers. All other operators require one port number.

port

Decimal number of a TCP or UDP port. A port number is a number from 0 to 65535.

TCP ports can be used only when filtering TCP. UDP ports can be used only when filtering UDP.

protocol-port

Name of a TCP or UDP port. TCP and UDP port names are listed in the “Usage Guidelines” section.

TCP port names can be used only when filtering TCP. UDP port names can be used only when filtering UDP.

established

(Optional) For the TCP protocol only: Indicates an established connection.

match-any

(Optional) For the TCP protocol only: Filters on any combination of TCP flags.

match-all

(Optional) For the TCP protocol only: Filters on all TCP flags.

+ | -

(Required) For the TCP protocol match-any , match-all : Prefix flag-name with + or - . Use the + flag-name argument to match packets with the TCP flag set. Use the - flag-name argument to match packets when the TCP flag is not set.

flag-name

(Optional) For the TCP protocol match-any , match-all . Flag names are: ack , fin , psh , rst , syn , urg .

Command Default

ICMP message generation is enabled by default.

Command Modes

IPv4 access list configuration

Command History

Release

Modification

Release 7.0.12

This command was introduced.

Release 7.8.1

log-input keyword was introduced.

Release 7.5.4

bitmask keyword was introduced.

Usage Guidelines

Use the deny command following the ipv4 access-list command to specify conditions under which a packet cannot pass the access list.

By default, the first statement in an access list is number 10, and the subsequent statements are incremented by 10.

You can add permit , deny , or remark statements to an existing access list without retyping the entire list. To add a new statement anywhere other than at the end of the list, create a new statement with an appropriate entry number that falls between two existing entry numbers to indicate where it belongs.

The following is a list of precedence names:

  • critical
  • flash
  • flash-override
  • immediate
  • internet
  • network
  • priority
  • routine

The following is a list of ICMP message type names:

  • administratively-prohibited
  • alternate-address
  • conversion-error
  • dod-host-prohibited
  • dod-net-prohibited
  • echo
  • echo-reply
  • general-parameter-problem
  • host-isolated
  • host-precedence-unreachable
  • host-redirect
  • host-tos-redirect
  • host-tos-unreachable
  • host-unknown
  • host-unreachable
  • information-reply
  • information-request
  • mask-reply
  • mask-request
  • mobile-redirect
  • net-redirect
  • net-tos-redirect
  • net-tos-unreachable
  • net-unreachable
  • network-unknown
  • no-room-for-option
  • option-missing
  • packet-too-big
  • parameter-problem
  • port-unreachable
  • precedence-unreachable
  • protocol-unreachable
  • reassembly-timeout
  • redirect
  • router-advertisement
  • router-solicitation
  • source-quench
  • source-route-failed
  • time-exceeded
  • timestamp-reply
  • timestamp-request
  • traceroute
  • unreachable

The following is a list of TCP port names that can be used instead of port numbers. Refer to the current Assigned Numbers RFC to find a reference to these protocols. You can find port numbers corresponding to these protocols by typing a ? in the place of a port number.

  • bgp
  • chargen
  • cmd
  • daytime
  • discard
  • domain
  • echo
  • exec
  • finger
  • ftp
  • ftp-data
  • gopher
  • hostname
  • ident
  • irc
  • klogin
  • kshell
  • login
  • lpd
  • nntp
  • pim-auto-rp
  • pop2
  • pop3
  • smtp
  • sunrpc
  • tacacs
  • talk
  • telnet
  • time
  • uucp
  • whois
  • www

The following UDP port names can be used instead of port numbers. Refer to the current Assigned Numbers RFC to find a reference to these protocols. You can find port numbers corresponding to these protocols by typing a ? in the place of a port number.

  • biff
  • bootpc
  • bootps
  • discard
  • dnsix
  • domain
  • echo
  • isakmp
  • mobile-ip
  • nameserver
  • netbios-dgm
  • netbios-ns
  • netbios-ss
  • ntp
  • pim-auto-rp
  • rip
  • snmp
  • snmptrap
  • sunrpc
  • syslog
  • tacacs
  • talk
  • tftp
  • time
  • who
  • xdmcp

Use the following flags in conjunction with the match-any and match-all keywords and the + and - signs to select the flags to display:

  • ack
  • fin
  • psh
  • rst
  • syn

For example, match-all + ack + syn displays TCP packets with both the ack and syn flags set, or match-any + ack - syn displays the TCP packets with the ack set or the syn not set.


Note

If any ACE in an ACL contains ABF clause, this ACL cannot be applied at any non-zero compression level.

Task ID

Task ID

Operations

ipv4

read, write

acl

read, write

Examples

This example shows how to set a deny condition for an access list named Internet filter: 



Router(config)# ipv4 access-list Internetfilter
Router(config-ipv4-acl)# 10 deny 192.168.34.0 0.0.0.255
Router(config-ipv4-acl)# 20 deny 172.16.0.0 0.0.255.255
Router(config-ipv4-acl)# 25 deny tcp host 172.16.0.0 gt bgp host 192.168.202.203 range 1300 1400
Router(config-ipv4-acl)# permit 10.0.0.0 0.255.255.255

Examples

This example shows how you can configure DSCP bitmask on ingress ERSPAN.

Router# config
Router(config)# ipv4 access-list acl1
Router(config-ipv4-acl)# 10 permit ipv4 host 192.0.2.1 any dscp af22 bitmask 0x3f
Router(config-ipv4-acl)# commit
Router(config-ipv4-acl)# exit
Router(config)# interface HundredGigE0/0/0/6
Router(config-if)# ipv4 address 192.0.2.51 255.255.255.0
Router(config-if)# monitor-session TEST ethernet direction rx-only port-level acl ipv4 acl1
Router(config-if)# commit

deny (IPv6)

To set deny conditions for an IPv6 access list, use the deny command in IPv6 access list configuration mode. To remove the deny conditions, use the no form of this command.

[sequence-number] deny protocol { source-ipv6-prefix/ prefix-length | any | host source-ipv6-address ipv6-wildcard-mask/ prefix-length } [ operator { port | protocol-port } ] [ dscp value [ bitmask value ] ] [ routing ] [ hop-by-hop ] [ authen ] [ destopts ] [ fragments ] [ packet-length operator packet-length value ] [ log | log-input ] [ ttl ttl value [ value1 . . . value2 ] ] icmp-off ]

no sequence-number

Internet Control Message Protocol (ICMP)

[ sequence-number] deny icmp { source-ipv6-prefix/ prefix-length | any | host source-ipv6-address ipv6-wildcard-mask/ prefix-length } { destination-ipv6-prefix/ prefix-length | any | host destination-ipv6-address ipv6-wildcard-mask/ prefix-length } [ icmp-type ] [ icmp-code ][ dscp value ] [ routing] [ hop-by-hop ] [ authen ] [ destopts ] [ fragments ] [ log ] [ icmp-off ]

Transmission Control Protocol (TCP)

[sequence-number]deny tcp {source-ipv6-prefix/ prefix-length | any | host source-ipv6-address ipv6-wildcard-mask/ prefix-length}[ operator {port | protocol-port}] {destination-ipv6-prefix/ prefix-length | any | host destination-ipv6-address ipv6-wildcard-mask/ prefix-length}[ operator {port | protocol | port}] [ dscpvalue] [ routing] [ hop-by-hop] [ authen] [ destopts] [ fragments] [ established] {match-any | match-all | + | -}[ flag-name] [ log] [ icmp-off]

User Datagram Protocol (UDP)

[sequence-number]deny tcp {source-ipv6-prefix/ prefix-length | any | host source-ipv6-address ipv6-wildcard-mask/ prefix-length}[ operator {port | protocol-port}] {destination-ipv6-prefix/ prefix-length | any | host destination-ipv6-address ipv6-wildcard-mask/ prefix-length}[ operator {port | protocol | port}] [ dscpvalue] [ routing] [ hop-by-hop] [ authen] [ destopts] [ fragments] [ established] [ flag-name] [ log] [ icmp-off]

Syntax Description

sequence-number

(Optional) Number of the deny statement in the access list. This number determines the order of the statements in the access list. Range is 1 to 2147483644. (By default, the first statement is number 10, and the subsequent statements are incremented by 10.)

protocol

Name or number of an Internet protocol. It can be one of the keywords ahp , esp , gre, icmp , igmp, igrp, ipinip, ipv6 , nos, ospf, pcp , tcp , or udp , or an integer in the range from 0 to 255 representing an IPv6 protocol number.

source-ipv6-prefix / prefix-length

The source IPv6 network or class of networks about which to set deny conditions.

This argument must be in the form documented in RFC 2373 where the address is specified in hexadecimal using 16-bit values between colons.

any

An abbreviation for the IPv6 prefix ::/0.

host source-ipv6-address

Source IPv6 host address about which to set deny conditions.

This source-ipv6-address argument must be in the form documented in RFC 2373 where the address is specified in hexadecimal using 16-bit values between colons.

ipv6-wildcard-mask

IPv6 wildcard mask. The IPv6 wildcard mask can take any IPv6 address value which is used instead of prefix length.

operator {port | protocol-port}

(Optional) Operand that compares the source or destination ports of the specified protocol. Operands are lt (less than), gt (greater than), eq (equal), neq (not equal), and range (inclusive range).

If the operator is positioned after the source-ipv6-prefix / prefix-length argument, it must match the source port.

If the operator is positioned after the destination-ipv6-prefix / prefix-length argument, it must match the destination port.

The range operator requires two port numbers. All other operators require one port number.

The port argument is the decimal number of a TCP or UDP port. Range is 0 to 65535. The protocol-port argument is the name of a TCP or UDP port. TCP port names can be used only when filtering TCP. UDP port names can be used only when filtering UDP.

destination-ipv6-prefix / prefix-length

Destination IPv6 network or class of networks about which to set deny conditions.

This argument must be in the form documented in RFC 2373 where the address is specified in hexadecimal using 16-bit values between colons.

host destination-ipv6-address

Destination IPv6 host address about which to set deny conditions.

This destination-ipv6-address argument must be in the form documented in RFC 2373 where the address is specified in hexadecimal using 16-bit values between colons.

dscp value

(Optional) Matches a differentiated services code point DSCP value against the traffic class value in the Traffic Class field of each IPv6 packet header. Range is 0 to 63.

routing

(Optional) Matches source-routed packets against the routing extension header within each IPv6 packet header.

hop-by-hop

(Optional) Supports Jumbo-grams. With the Router Alert option, it is an integral part in the operation of Multicast Listener Discovery (MLD). Router Alert [3] is an integral part in the operations of IPv6 Multicast through MLD and RSVP for IPv6.

authen

(Optional) Matches if the IPv6 egress authentication header is present.

destopts

(Optional) Matches if the IPv6 egress destination options header is present.

fragments

(Optional) Matches noninitial fragmented packets where the fragment extension header contains a nonzero fragment offset. The fragments keyword is an option only if the operator [ port-number ] arguments are not specified.

log

(Optional) Causes an informational logging message about the packet that matches the entry to be sent to the console. (The level of messages logged to the console is controlled by the logging console command.)

Note

 

ACL logging is supported only in ingress direction for both IPv4 and IPv6.

The message includes the access list name and sequence number, whether the packet was denied; the protocol, whether it was TCP, UDP, ICMP, or a number; and, if appropriate, the source and destination addresses and source and destination port numbers. The message is generated for the first packet that matches, and then at 5-minute intervals, including the number of packets denied in the prior 5-minute interval.

log-input

(Optional) Provides the same function as the log keyword, except that the log-message also includes the input interface.

ttl

(Optional) Turns on matching against time-to-life (TTL) value. For IPv6 packets, ttl is also referred to as hop limit.

ttl value [value1 ... value2]

(Optional) TTL value used for filtering. Range is 1 to 255.

If only value is specified, the match is against this value.

If both value1 and value2 are specified, the packet TTL is matched against the range of TTLs between value1 and value2 .

operator

(Optional) Operand that compares the source or destination ports of the specified protocol. Operands are lt (less than), gt (greater than), eq (equal), neq (not equal), and range (inclusive range).

icmp-off

(Optional) Turns off ICMP generation for denied packets.

icmp-type

(Optional) ICMP message type for filtering ICMP packets. ICMP packets can be filtered by ICMP message type. Range is 0 to 255.

icmp-code

(Optional) ICMP message code for filtering ICMP packets. ICMP packets that are filtered by ICMP message type can also be filtered by the ICMP message code. Range is 0 to 255.

established

(Optional) For the TCP protocol only: Indicates an established connection.

match-any

(Optional) For the TCP protocol only: Filters on any combination of TCP flags.

match-all

(Optional) For the TCP protocol only: Filters on all TCP flags.

+ | -

(Required) For the TCP protocol match-any , match-all : Prefix flag-name with + or - . Use the + flag-name argument to match packets with the TCP flag set. Use the - flag-name argument to match packets when the TCP flag is not set.

flag-name

(Optional) For the TCP protocol match-any , match-all . Flag names are: ack, fin, psh, rst, syn, urg.

Command Default

ICMP message generation is enabled by default.

Command Modes

IPv6 access list configuration

Command History

Release

Modification

Release 7.0.12

This command was introduced.

Release 7.2.1

Ingress IPv6 TCP flags are supported.

Release 7.3.15

Egress IPv6 TCP flags are supported.

Release 7.8.1

log-input keyword was introduced.

Release 7.8.1

ttl keyword was introduced.

Release 7.5.4

bitmask keyword was introduced.

Release 7.10.1

IPv6 AHP and ESP headers are supported.

Usage Guidelines

The deny (IPv6) command is similar to the deny (IPv4) command, except that it is IPv6-specific.

Use the deny (IPv6) command following the ipv6 access-list command to define the conditions under which a packet passes the access list.


Note

If any ACE in an ACL contains ABF clause, this ACL cannot be applied at any non-zero compression level.

Specifying ipv6 for the protocol argument matches against the IPv6 header of the packet.

By default, the first statement in an access list is number 10, and the subsequent statements are numbered in increments of 10.

You can add permit, deny, or remark statements to an existing access list without retyping the entire list. To add a new statement anywhere other than at the end of the list, create a new statement with an appropriate entry number that falls between two existing entry numbers to indicate where it belongs.

Both the source-ipv6-prefix/prefix-length and destination-ipv6-prefix/prefix-length arguments are used for traffic filtering (the source prefix filters traffic based upon the traffic source; the destination prefix filters traffic based upon the traffic destination).


Note

IPv6 prefix lists, not access lists, should be used for filtering routing protocol prefixes.

The fragments keyword is an option only if the operator [port | protocol-port ] arguments are not specified.

Task ID

Task ID

Operations

acl

read, write

Examples

The following example shows how to configure the IPv6 access list named toCISCO and apply the access list to the traffic entering the HundredGigE interface 0/2/0/2. Specifically, the deny entry in the list keeps all packets that have a destination TCP port number greater than 5000 from entering the HundredGigE interface 0/2/0/2. The permit entry in the list permits all ICMP packets to enter the HundredGigE interface 0/2/0/2. 



Router(config)# ipv6 access-list toCISCO
Router(config-ipv6-acl)# deny tcp any any gt 5000
Router(config-ipv6-acl)# permit icmp any any
Router(config)#  interface HundredGigE 0/2/0/2
Router(config-if)# ipv6 access-group tOCISCO ingress

Examples

The following example shows how to configure the IPv6 access list named toCISCO and apply the access list to the traffic entering theHundredGigE interface 0/2/0/2. Specifically, the deny entry in the list keeps all packets that have a hop-by-hop optional field from entering the HundredGigE interface 0/2/0/2. 



Router(config)# ipv6 access-list toCISCO
Router(config-ipv6-acl)# deny ipv6 any any hop-by-hop
Router(config)#  interface HundredGigE 0/2/0/2
Router(config-if)# ipv6 access-group tOCISCO ingress

Examples

The following example shows how you can configure DSCP bitmask on ingress ERSPAN.

Router# config
Router(config)# ipv6 access-list acl1 
Router(config-ipv6-acl)# 10 permit ipv6 host 2001:DB8::2/32 any dscp 33 bitmask 0x3f
Router(config-ipv6-acl)# commit
Router(config-ipv6-acl)# exit
Router(config)# interface HundredGigE 0/0/10/3
Router(config-if)# ipv6 address 2001:DB8::1/32
Router(config-if)# monitor-session TEST ethernet direction rx-only port-level acl ipv6 acl1
Router(config-if)# commit

Examples

The following example shows how you can configure AHP and ESP headers on an ACLs.
Router(config)# #ipv6 access-list ipv6_umpp_access_list
Router(config-ipv6-acl)# 12 deny ahp any any
Router(config-ipv6-acl)# ipv6 access-list ipv6_umpp_access_list
Router(config-ipv6-acl)# 14 deny esp any any
Router(config-ipv6-acl)# commit 
Router(config-ipv6-acl)# exit

dont-fragment

To configure an access list to match on the dont-fragment flag.

fragment-type dont-fragment {capture | counter | first-fragment | is-fragment | last-fragment | log | log-input | set | udf | nexthop1 }

Syntax Description

capture

ACL matches on the dont-fragment flag, and captures the matched packet.

counter

ACL matches on the dont-fragment flag, and displays the counter for the matches.

first-fragment

ACL matches on the dont-fragment flag, and then matches on the first-fragment flag.

is-fragment

ACL matches on the dont-fragment flag, and then matches on the is-fragment flag.

last-fragment

ACL matches on the dont-fragment flag, and then matches on the last-fragment flag.

log

ACL matches on the dont-fragment flag and logs the matches.

log-input

ACL matches on the dont-fragment flag and logs the matches, incuding on the input interface.

set

ACL matches on the dont-fragment flag and sets a particular action on the matches.

udf

ACL matches on the dont-fragment flag, and sets the user-defined fields for the matches.

nexthop1

ACL matches on the dont-fragment flag, and then matches on the nexthop1 flag.

Command Default

None

Command Modes

ACL configuration mode

Command History

Release Modification

Release 7.3.1

This command was introduced.

Usage Guidelines

This command is supported only for IPv4 ACLs.

Examples

Use the following sample configuration to match on the dont-fragment flag. 


/* Enter the global configuraton mode and configure an IPv4 access list */
Router# config
Router(config)# ipv4 access-list TEST
Router(config-ipv4-acl)# 10 permit tcp any any

/* Configure an ACE to match on the dont-fragment flag (indicates a non-fragmented packet)
 and forward the packet to the default (pre-configured) next hop  */
Router(config-ipv4-acl)# 20 permit tcp any any fragment-type dont-fragment nexthop1 ipv4 192.0.2.1 
Router(config-ipv4-acl)# commit

first-fragment

To configure an ACL to match on the first-fragment flag.

fragment-type first-fragment {capture | counter | log | log-input | set | udf | <none> }

Syntax Description

capture

ACL matches on the first-fragment flag, and captures the matched packet.

counter

ACL matches on the first-fragment flag, and displays the counter for the matches.

log

ACL matches on the first-fragment flag and logs the matches.

log-input

ACL matches on the first-fragment flag and logs the matches, incuding on the input interface.

set

ACL matches on the first-fragment flag and sets a particular action on the matches.

udf

ACL matches on the first-fragment flag, and sets the user-defined fields for the matches.

nexthop1

ACL matches on the first-fragment flag, and then matches on the nexthop1 flag.

Command Default

None

Command Modes

ACL configuration mode.

Command History

Release Modification

Release 7.3.1

This command was introduced.

Usage Guidelines

This command is supported only for IPv4 ACLs.

Examples

Use the following sample configuration to match on the first-fragment flag. 


/* Enter the global configuraton mode and configure an IPv4 access list */
Router# config
Router(config)# ipv4 access-list TEST
Router(config-ipv4-acl)# 10 permit tcp any any

/* Configure an ACE to match on the first-fragment flag (indicates the first fragment of a fragmented packet)
 and forward the packet to a next hop of 20.20.20.1  */
Router(config-ipv4-acl)# 40 permit ospf any any fragment-type first-fragment nexthop1 ipv4 192.0.2.1
Router(config-ipv4-acl)# commit

fragment-offset

To enable packet filtering at an ingress or egress interface by specifying fragment-offset as a match condition in an IPv4 or IPv6 ACL, use the fragment-offset option in permit or deny command in IPv4 or IPv6 access-list configuration mode. To disable this feature, use the no form of this command.

fragment-offset {eq value | gt value | lt value | neq value | range lower-limit upper-limit}

Syntax Description

fragment-offset eq value

Filters packets that have a fragment offset equal to the specified limit.

fragment-offset gt value

Filters packets that have a fragment offset greater than the specified limit.

fragment-offset lt value

Filters packets that have a fragment offset less than the specified limit.

fragment-offset neq value

Filters packets that have a fragment offset that does not match the specified limit.

fragment-offset range lower-limit upper-limit

Filters packets that have a fragment offset within the specified range.

Command Default

None

Command Modes

IPv4 or IPv6 Access List Configuration mode

Release Modification

Release 7.3.1

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Examples

This example shows how to configure an IPv4 access list to filter packets by the fragment-offset condition: 

Router# config
Router(config)# ipv4 access-list fragment-offset-acl
Router(config-ipv4-acl)# 10 permit ipv4 any any fragment-offset range 300 400

fragment-type

To configure an access list to match on the type of fragment.

fragment-type {dont-fragment | first-fragment | is-fragment | last-fragment }

Syntax Description

dont-fragment

ACL matches on the dont-fragment flag

first-fragment

ACL matches on the first-fragment flag

is-fragment

ACL matches on the is-fragment flag

last-fragment

ACL matches on the last-fragment flag

Command Default

None

Command Modes

ACL configuration mode

Command History

Release Modification
Release 7.3.1

This command was introduced.

Usage Guidelines

This command is supported only for IPv4 access lists.

Examples

Use the following sample configuration to configure an ACL to match on the type of fragment.. 


/* Enter the global configuraton mode and configure an IPv4 access list */
Router# config
Router(config)# ipv4 access-list TEST
Router(config-ipv4-acl)# 10 permit tcp any any

/* Configure an ACE to match on the dont-fragment flag (indicates a non-fragmented packet)
 and forward the packet to the default (pre-configured) next hop  */
Router(config-ipv4-acl)# 20 permit tcp any any fragment-type dont-fragment default 

/* Configure an ACE to match on the is-fragment flag (indicates a fragmented packet)
 and forward the packet to a next hop of 10.10.10.1  */
Router(config-ipv4-acl)# 30 permit udp any any fragment-type is-fragment nexthop1 ipv4 10.10.10.1

/* Configure an ACE to match on the first-fragment flag (indicates the first fragment of a fragmented packet)
 and forward the packet to a next hop of 20.20.20.1  */
Router(config-ipv4-acl)# 40 permit ospf any any fragment-type first-fragment nexthop1 ipv4 20.20.20.1


/* Configure an ACE to match on the last-fragment flag (indicates the last fragment of a fragmented packet)
 and forward the packet to a next hop of 30.30.30.1  */
Router(config-ipv4-acl)# 50 permit icmp any any fragment-type last-fragment nexthop1 ipv4 30.30.30.1
Router(config-ipv4-acl)# commit

hw-module profile stats acl-permit

To obtain statistics of the packet count of the routing traffic that an ACL permits, use the hw-module profile stats acl-permit command in XR Config mode. To disable the tracking of permitted packet count, use the no form of this command.

hw-module profile stats acl-permit

no hw-module profile stats acl-permit

Syntax Description

This command has no keywords or arguments.

Command Default

If you do not configure the hw-module profile stats acl-permit command, you cannot enable the statistics for the routing traffic that an ACL permits.

Command Mode

XR Config

Command History

Release

Modification

Release 7.3.2

Supports logging of permit statistics for ACL-based forwarding (ABF).

Release 7.2.12

This command was introduced.

Usage Guidelines

  • The permit statistics of the routing traffic that an ACL allows are available only after you execute the hw-module profile stats acl-permit command and based on the requirement, reboot the line cards or the router.

Task ID

Operations

config-services

read, write

root-lr

read, write

Examples

The following example shows you how to configure the acl-permit command: 



Router# configure
Router(config)# hw-module profile stats acl-permit
Fri Aug  7 05:52:58.052 UTC
In order to activate/deactivate this stats profile, you must manually reload the chassis/all line cards
Router(config)# commit
Fri Aug 7 05:55:50.103 UTC
LC/0/4/CPU0:Aug 7 05:55:50.218 UTC: fia_driver[245]: %FABRIC-FIA_DRVR-4-STATS_HW_PROFILE_MISMATCH : Mismatch found, reload LC to activate the new stats profile
Router(config)#

ipv4 access-group

To control access to an interface, use the ipv4 access-group command in interface configuration mode. To remove the specified access group, use the no form of this command.

ipv4 access-group access-list-name { ingress | egress } [ compress level compression-level ]

Syntax Description

access-list-name

Name of an IPv4 access list as specified by an ipv6 access-list command.

ingress

Filters on inbound packets.

egress

Filters on outbound packets.

compress level compression-level

Configures compression level for interface ACLs. Compression level values range from zero and five.

Command Default

The interface does not have an IPv4 access list applied to it.

Command Modes

Interface configuration

Command History

Release

Modification

Release 7.0.12

This command was introduced.

Release 7.3.1

Compression level can be configured

Usage Guidelines

Use the ipv4 access-group command to control access to an interface. To remove the specified access group, use the no form of the command. Use the access-list-name argument to specify a particular IPv4 access list.

Filtering of MPLS packets through interface ACL is not supported.

If the access list permits the addresses, the software continues to process the packet. If the access list denies the address, the software discards the packet and returns an Internet Control Message Protocol (ICMP) host unreachable message.

If the specified access list does not exist, all packets are passed.

By default, the unique or per-interface ACL statistics are disabled.

Task ID

Task ID

Operations

acl

read, write

network

read, write

Examples

The following example shows how to apply filters on packets from HundredGigE interface 0/2/0/2: 


Router(config)# interface HundredGigE 0/2/0/2
Router(config-if)# ipv4 access-group p-ingress-filter ingress
The following example shows how to apply compress level 2 on ingress traffic: 


Router(config)# interface HundredGigE 0/2/0/0
Router(config-if)# ipv4 access-group p-ingress-filter ingress compress level 2

Examples

This example shows how to apply compression level 2 on egress traffic for an IPv4 Hybrid ACL, where you've already created a network object group and attached an ACL(network-object-acl) to it:
Router# configure
Router(config)# interface HundredGigE 0/0/10/3
Router(config-if)# ipv4 address 1.1.1.1/24
Router(config-if)# no shut
Router(config-if)# ipv4 access-group network-object-acl egress compress level 2
Router(config-if)# commit
Router(config-if)# exit

ipv4 access-list

To define an IPv4 access list by name, use the ipv4 access-list command in XR Config mode. To remove all entries in an IPv4 access list, use the no form of this command.

ipv4 access-list name

no ipv4 access-list name

Syntax Description

name

Name of the access list. Names cannot contain a space or quotation marks.

Command Default

No IPv4 access list is defined.

Command Modes

XR Config mode

Command History

Release

Modification

Release 7.0.12

This command was introduced.

Usage Guidelines

Use the ipv4 access-list command to configure an IPv4 access list. This command places the router in access list configuration mode, in which the denied or permitted access conditions must be defined with the deny or permit command.

Use the ipv4 access-group command to apply the access list to an interface.

Task ID

Task ID

Operations

acl

read, write

Examples

This example shows how to define a standard access list named Internetfilter: 


Router(config)# ipv4 access-list Internetfilter
Router(config-ipv4-acl)# 10 permit 192.168.34.0 0.0.0.255
Router(config-ipv4-acl)# 20 permit 172.16.0.0 0.0.255.255
Router(config-ipv4-acl)# 30 permit 10.0.0.0 0.255.255.255
Router(config-ipv4-acl)# 39 remark Block BGP traffic from 172.16 net.
Router(config-ipv4-acl)# 40 deny tcp host 172.16.0.0 eq bgp host 192.168.202.203 range 1300 1400

ipv4 access-list log-update rate

To specify the rate at which IPv4 access lists are logged, use the ipv4 access-list log-update rate command in XR Config mode. To return the update rate to the default setting, use the no form of this command.

ipv4 access-list log-update rate rate-number

no ipv4 access-list log-update rate rate-number

Syntax Description

rate-number

Rate at which IPv4 access hit logs are generated per second on the router. Range is 1 to 1000.

Command Default

Default is 1.

Command Modes

XR Config mode

Command History

Release

Modification

Release 7.0.12

This command was introduced.

Usage Guidelines

The rate-number argument applies to all the IPv4 access-lists configured on the interfaces. That is, at any given time there can be between 1 and 1000 log entries for the system.

Task ID

Task ID

Operations

ipv4

read, write

acl

read, write

Examples

The following example shows how to configure a IPv4 access hit logging rate for the system: 



Router(config)# ipv4 access-list log-update rate 10

ipv4 access-list log-update threshold

To specify the number of updates that are logged for IPv4 access lists, use the ipv4 access-list log-update threshold command in XR Config mode. To return the number of logged updates to the default setting, use the no form of this command.

ipv4 access-list log-update threshold update-number

no ipv4 access-list log-update threshold update-number

Syntax Description

update-number

Number of updates that are logged for every IPv4 access list configured on the router. Range is 0 to 2147483647.

Command Default

For IPv4 access lists, 2147483647 updates are logged.

Command Modes

XR Config mode

Command History

Release

Modification

Release 7.0.12

This command was introduced.

Usage Guidelines

IPv4 access list updates are logged at 5-minute intervals, following the first logged update. Configuring a lower number of updates (a number lower than the default) is useful when more frequent update logging is desired.

Task ID

Task ID

Operations

basic-services

read, write

acl

read, write

Examples

This example shows how to configure a log threshold of ten updates for every IPv4 access list configured on the router: 



Router(config)# ipv4 access-list log-update threshold 10

ipv6 access-group

To control access to an interface, use the ipv6 access-group command in interface configuration mode. To remove the specified access group, use the no form of this command.

ipv6 access-group access-list-name { ingress | egress } [ compress level compression-level ]

Syntax Description

access-list-name

Name of an IPv6 access list as specified by an ipv6 access-list command.

ingress

Filters on inbound packets.

compress level compression-level

Configures compression level for interface ACLs. Compression level values range from zero and five.

Command Default

The interface does not have an IPv6 access list applied to it.

Command Modes

Interface configuration

Command History

Release

Modification

Release 7.0.12

This command was introduced.

Release 7.3.1

Compression level can be configured

Usage Guidelines

Use compression level two to create Hybrid ACLs with an ACE that uses IPv6 extension headers to filter ingress and egress IPv6 packets.

Task ID

Task ID

Operations

acl

read, write

ipv6

read, write

Examples

This example shows how to apply filters on packets from HundredGigE interface 0/2/0/2: 

Router(config)# interface HundredGigE 0/2/0/2
Router(config-if)# ipv6 access-group p-in-filter ingress
This example shows how to create an ingress IPv6 Hybrid ACL with compression level 2 based on extensions headers:
Router# configure
Router(config)# ipv6 access-list ACL-EXT-HEADER
Router(config-ipv6-acl)# 10 deny ipv6 any any routing
Router(config-ipv6-acl)# commit
Router(config-ipv6-acl)# exit
Router(config)# interface hundredGigE 0/4/0/36
Router(config-if)# ipv6 access-group ACL-EXT-HEADER ingress compress level 2
Router(config-if)# commit

Examples

This example shows how to create an egress IPv6 Hybrid ACL with compression level 2 based on extensions headers:
Router# configure
Router(config)# ipv6 access-list ACL-EGRESS
Router(config-ipv6-acl)# 10 deny ipv6 any any routing
Router(config-ipv6-acl)# commit
Router(config-ipv6-acl)# exit
Router(config)# interface hundredGigE 0/4/0/13
Router(config-if)# ipv6 access-group ACL-EGRESS egress compress level 2
Router(config-if)# commit

ipv6 access-list

To define an IPv6 access list and to place the router in IPv6 access list configuration mode, use the ipv6 access-list command in interface configuration mode. To remove the access list, use the no form of this command.

ipv6 access-list name

no ipv6 access-list name

Syntax Description

name

Name of the IPv6 access list. Names cannot contain a space or quotation mark, or begin with a numeric.

Command Default

No IPv6 access list is defined.

Command Modes

Interface configuration

Command History

Release

Modification

Release 7.0.12

This command was introduced.

Usage Guidelines

The ipv6 access-list command is similar to the ipv4 access-list command, except that it is IPv6-specific.

The IPv6 access lists are used for traffic filtering based on source and destination addresses, IPv6 option headers, and optional, upper-layer protocol type information for finer granularity of control. IPv6 access lists are defined by using the ipv6 access-list command in XR Config mode mode and their permit and deny conditions are set by using the deny and permit commands in IPv6 access list configuration mode. Configuring the ipv6 access-list command places the router in IPv6 access list configuration mode—the router prompt changes to router (config-ipv6-acl)#. From IPv6 access list configuration mode, permit and deny conditions can be set for the defined IPv6 access list.

See the “Examples” section for an example of a translated IPv6 access control list (ACL) configuration.


Note

No more than one IPv6 access list can be applied to an interface per direction.


Note

Every IPv6 access list has an implicit deny ipv6 any any statement as its last match condition. An IPv6 access list must contain at least one entry for the implicit deny ipv6 any any statement to take effect.


Note

IPv6 prefix lists, not access lists, should be used for filtering routing protocol prefixes.

Use the ipv6 access-group interface configuration command with the access-list-name argument to apply an IPv6 access list to an IPv6 interface.


Note

An IPv6 access list applied to an interface with the ipv6 access-group command filters traffic that is forwarded, not originated, by the router.


Note

Every IPv6 ACL has implicit permit icmp any any nd-na , permit icmp any any nd-ns , and deny ipv6 any any statements as its last match conditions. (The former two match conditions allow for ICMPv6 neighbor discovery.) An IPv6 ACL must contain at least one entry for the implicit deny ipv6 any any statement to take effect.permit icmp any any nd-na permit icmp any any nd-ns deny ipv6 any any deny ipv6 any any .

The IPv6 neighbor discovery process makes use of the IPv6 network layer service; therefore, by default, IPv6 ACLs implicitly allow IPv6 neighbor discovery packets to be sent and received on an interface. In IPv4, the Address Resolution Protocol (ARP), which is equivalent to the IPv6 neighbor discovery process, makes use of a separate data link layer protocol; therefore, by default, IPv4 ACLs implicitly allow ARP packets to be sent and received on an interface.

Task ID

Task ID

Operations

acl

read, write

ipv6

read, write

Examples

This example shows how to configure the IPv6 access list named list2 and applies the ACL to traffic on interface HundredGigE 0/2/0/2. Specifically, the first ACL entry keeps all packets from the network fec0:0:0:2::/64 (packets that have the site-local prefix fec0:0:0:2 as the first 64 bits of their source IPv6 address) from exiting out of interface HundredGigE 0/2/0/2. The second entry in the ACL permits all other traffic to exit out of interface HundredGigE 0/2/0/2. The second entry is necessary because an implicit deny all condition is at the end of each IPv6 ACL. 

Router(config)# ipv6 access-list list2
Router(config-ipv6-acl)# 10 deny fec0:0:0:2::/64 any
Router(config-ipv6-acl)# 20 permit any any

Router# show ipv6 access-lists list2

ipv6 access-list list2
  10 deny ipv6 fec0:0:0:2::/64 any
  20 permit ipv6 any any

Router(config)# interface HundredGigE 0/2/0/2

Note

IPv6 is automatically configured as the protocol type in permit any any and deny any any statements that are translated from XR Config mode mode to IPv6 access list configuration mode.


Note

An IPv6 router does not forward to another network an IPv6 packet that has a link-local address as either its source or destination address (and the source interface for the packet is different from the destination interface for the packet).

ipv6 access-list log-update rate

To specify the rate at which IPv6 access lists are logged, use the ipv6 access-list log-update rate command in XR Config mode. To return the update rate to the default setting, use the no form of this command.

ipv6 access-list log-update rate rate-number

no ipv6 access-list log-update rate rate-number

Syntax Description

rate-number

Rate at which IPv6 access hit logs are generated per second on the router. Range is 1 to 1000.

Command Default

Default is 1.

Command Modes

XR Config mode

Command History

Release

Modification

Release 7.0.12

This command was introduced.

Usage Guidelines

The rate-number argument applies to all the IPv6 access-lists configured on the interfaces. That is, at any given time there can be between 1 and 1000 log entries for the system.

Task ID

Task ID

Operations

ipv6

read, write

acl

read, write

Examples

This example shows how to configure a IPv6 access hit logging rate for the system: 


Router(config)# ipv6 access-list log-update rate 10

ipv6 access-list log-update threshold

To specify the number of updates that are logged for IPv6 access lists (ACLs), use the ipv6 access-list log-update threshold command in XR Config mode. To return the number of logged updates to the default setting, use the no form of this command.

ipv6 access-list log-update threshold update-number

no ipv6 access-list log-update threshold update-number

Syntax Description

update-number

Number of updates that are logged for every IPv6 access list configured on the router. Range is 0 to 2147483647.

Command Default

For IPv6 access lists, 350000 updates are logged.

Command Modes

XR Config mode

Command History

Release

Modification

Release 7.0.12

This command was introduced.

Usage Guidelines

The ipv6 access-list log-update threshold command is similar to the ipv4 access-list log-update threshold command, except that it is IPv6-specific.

IPv6 access list updates are logged at 5-minute intervals, following the first logged update. Configuring a lower number of updates (a number lower than the default) is useful when more frequent update logging is desired.

Task ID

Task ID

Operations

acl

read, write

ipv6

read, write

Examples

This example shows how to configure a log threshold of ten updates for every IPv6 access list configured on the router: 


Router(config)# ipv6 access-list log-update threshold 10

is-fragment

To configure an ACL to match on the is-fragment flag.

fragment-type is-fragment {capture | counter | log | log-input | set | udf | nexthop1 }

Syntax Description

capture

ACL matches on the is-fragment flag, and captures the matched packet.

counter

ACL matches on the is-fragment flag, and displays the counter for the matches.

log

ACL matches on the is-fragment flag and logs the matches.

log-input

ACL matches on the is-fragment flag and logs the matches, incuding on the input interface.

set

ACL matches on the is-fragment flag and sets a particular action on the matches.

udf

ACL matches on the is-fragment flag, and sets the user-defined fields for the matches.

nexthop1

ACL matches on the is-fragment flag, and then matches on the nexthop1 flag.

Command Default

None

Command Modes

ACL configuration mode.

Command History

Release Modification
Release 7.3.1

This command was introduced.

Usage Guidelines

This command is supported only for IPv4 ACLs.

Examples

Use the following sample configuration to match on the is-fragment flag. 


/* Enter the global configuraton mode and configure an IPv4 access list */
Router# config
Router(config)# ipv4 access-list TEST
Router(config-ipv4-acl)# 10 permit tcp any any 

/* Configure an ACE to match on the is-fragment flag (indicates a fragmented packet)
 and forward the packet to a next hop of 10.10.10.1  */
Router(config-ipv4-acl)# 30 permit udp any any fragment-type is-fragment nexthop1 ipv4 192.0.2.1
Router(config-ipv4-acl)# commit

last-fragment

To configure an access list to match on the last-fragment flag.

fragment-type last-fragment {capture | counter | log | log-input | set | udf | nexthop1 }

Syntax Description

capture

ACL matches on the last-fragment flag, and captures the matched packet.

counter

ACL matches on the last-fragment flag, and displays the counter for the matches.

log

ACL matches on the last-fragment flag and logs the matches.

log-input

ACL matches on the last-fragment flag and logs the matches, incuding on the input interface.

set

ACL matches on the dont-fragment flag and sets a particular action on the matches.

udf

ACL matches on the last-fragment flag, and sets the user-defined fields for the matches.

nexthop1

ACL matches on the last-fragment flag, and then matches on the nexthop1 flag.

Command Default

None

Command Modes

ACL configuration mode.

Command History

Release Modification
Release 7.3.1

This command was introduced.

Usage Guidelines

This command is supported only for IPv4 ACLs.

Examples

Use the following sample configuration to match on the last-fragment flag. 


/* Enter the global configuraton mode and configure an IPv4 access list */
Router# config
Router(config)# ipv4 access-list TEST
Router(config-ipv4-acl)# 10 permit tcp any any

/* Configure an ACE to match on the last-fragment flag (indicates the last fragment of a fragmented packet)
 and forward the packet to a next hop of 30.30.30.1  */
Router(config-ipv4-acl)# 50 permit icmp any any fragment-type last-fragment nexthop1 ipv4 192.0.2.1
Router(config-ipv4-acl)# commit

object-group network

To configure a network object group, and to enter the network object group configuration mode, use the object-group network command in the global configuration mode. To de-configure the network object group, use the no form of this command.

object-group network { ipv4 | ipv6 } object-group-name

no object-group network { ipv4 | ipv6 } object-group-name

Syntax Description

ipv4

Configures the operation state of an IPV4 network object group.

ipv6

Configures the operation state of an IPV6 network object group.

object-group-name

Name of the object-group.

Command Default

None

Command Modes

Global configuration

Command History

Release Modification

Release 7.3.1

This command was introduced.

Usage Guidelines

Inherited object-groups up to four levels are supported in this release.

If an ACL is applied on an interface with non-zero compression level (implying it contains no ABF ACEs), a user cannot add an ACE with object-group.

Task ID

Task ID Operation
system

read, write

Examples

This example shows how to configure a network object-group, and to enter the network object-group configuration mode: 


Router# configure
Router(config)# object-group network ipv4 ipv4_type5_obj1
Router(config-object-group-ipv4)#

object-group port

To configure a port object group, and to enter the port object group configuration mode, use the object-group port command in the global configuration mode. To de-configure the port object group, use the no form of this command.

object-group port object-group-name

no object-group port object-group-name

Syntax Description

object-group-name

Name of the object-group.

Command Default

None

Command Modes

Global configuration

Command History

Release Modification

Release 7.3.1

This command was introduced.

Usage Guidelines

Inherited object-groups upto four levels are supported.


Note

If any ACE in an ACL contains ABF clause, this ACL cannot be applied at any non-zero compression level.

Task ID

Task ID Operation
system

read, write

Examples

This example show how to configure a port object-group, and to enter the port object-group configuration mode: 



Router# configure
Router(config)# object-group port ipv4_type5_obj1
Router(config-object-group-port)#

packet-length

Enables filtering of packets at an ingress/egress interface by specifying the packet length as a match condition in a IPv4/IPv6 ACL.

By using the packet-length condition in an ACL, IPv4 and IPv6 packets are either processed (permit statement) or dropped (deny statement).

To remove this configuration, use the no prefix for the command.

packet-length { eq value | gt value | lt value | neq value | range lower-limit upper-limit }

Syntax Description

packet-length eq value

Filters packets that have a packet length equal to the specified limit.

packet-length gt value

Filters packets that have a packet length greater than the specified limit.

packet-length lt value

Filters packets that have a packet length less than the specified limit.

packet-length neq value

Filters packets that have a packet length that does not match the specified limit.
packet-length range lower-limit upper-limit

Filters packets that have a packet length within the specified range. The IPv4/IPv6 packet length ranges from 0 to 65535.

Command Default

None

Command Modes

Access List Configuration mode

Release Modification

Release 7.3.1

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Examples

The following example shows how you can configure an IPv4 access list with the packet-length condition. 

Router# config
Router(config)# ipv4 access-list pktlen-v4
Router(config-ipv4-acl)# 10 permit tcp any any packet-length eq 1482
Router(config-ipv4-acl)# 20 permit udp any any packet-length range 1400 1500
Router(config-ipv4-acl)# 30 deny ipv4 any any

The following example shows how you can configure an IPv6 access list with the packet-length condition. 

Router# config
Router(config)# ipv6 access-list pktlen-v6
Router(config-ipv6-acl)# 10 permit tcp any any packet-length eq 1500
Router(config-ipv6-acl)# 20 permit udp any any packet-length range 1500 1600
Router(config-ipv6-acl)# 30 deny ipv6 any any

permit (IPv4)

To set conditions for an IPv4 access list, use the permit command in access list configuration mode. There are two versions of the permit command: permit (source), permit (destination), and permit (protocol). To remove a condition from an access list, use the no form of this command.

[ sequence-number ] permit source [ source-wildcard ] [ log | log-input ]

[ sequence-number ] permit protocol source source-wildcard destination destination-wildcard [ precedence precedence ] [ nexthop [ ipv4-address1 ] [ ipv4-address2 ] [ ipv4-address3 ] ] [ dscp dscp [ bitmask value ] ] [fragments] [ log | log-input ] [ nexthop [ track track-name ] [ ipv4-address1 ] [ ipv4-address2 ] [ ipv4-address3 ] [ ttl ttl value [ value1 . . . value2 ] ]

no sequence-number

Internet Control Message Protocol (ICMP)

[sequence-number] permit icmp source source-wildcard destination destination-wildcard [icmp-type] [icmp-code] [precedence precedence] [dscp dscp] [fragments]

Transmission Control Protocol (TCP)

[sequence-number] permit tcp { source-ipv4-prefix/ prefix-length | any | host source-ipv4-address ipv4-wildcard-mask/prefix-length } [ operator { port | protocol-port } ] { destination-ipv4-prefix/ prefix-length | any | host destination-ipv4-address ipv4-wildcard-mask/prefix-length } [ operator { port | protocol | port } ] [ dscp value ] [ routing ] [ hop-by-hop ] [ authen ] [ destopts ] [ fragments ] [ established ] { match-any | match-all | + | - } [ flag-name ] [ log ]

Internet Group Management Protocol (IGMP)

[sequence-number] permit igmp source source-wildcard destination destination-wildcard [igmp-type] [precedence precedence] [dscp value] [fragments]

User Datagram Protocol (UDP)

[sequence-number] permit udp source source-wildcard [operator {port | protocol-port}] destination destination-wildcard [operator {port | protocol-port}] [precedence precedence] [dscp dscp] [fragments]

Syntax Description

sequence-number

(Optional) Number of the permit statement in the access list. This number determines the order of the statements in the access list. Range is 1 to 2147483644. (By default, the first statement is number 10, and the subsequent statements are incremented by 10.)

source

Number of the network or host from which the packet is being sent. There are three alternative ways to specify the source:

  • Use a 32-bit quantity in four-part dotted-decimal format.
  • Use the any keyword as an abbreviation for a source and source-wildcard of 0.0.0.0 255.255.255.255.
  • Use the host source combination as an abbreviation for a source and source-wildcard of source 0.0.0.0.

source-wildcard

Wildcard bits to be applied to the source. There are three alternative ways to specify the source wildcard:

  • Use a 32-bit quantity in four-part dotted-decimal format. Place ones in the bit positions you want to ignore.
  • Use the any keyword as an abbreviation for a source and source-wildcard of 0.0.0.0 255.255.255.255.
  • Use the host source combination as an abbreviation for a source and source-wildcard of source 0.0.0.0.

protocol

Name or number of an IP protocol. It can be one of the keywords ahp , esp , gre , icmp , igmp , igrp , ip , ipinip , nos , ospf , pim , pcp , tcp , or udp , or an integer from 0 to 255 representing an IP protocol number. To match any Internet protocol (including ICMP, TCP, and UDP), use the ip keyword. ICMP, and TCP allow further qualifiers, which are described later in this table.

Note

 

Filtering on AHP protocol is not supported.

destination

Number of the network or host to which the packet is being sent. There are three alternative ways to specify the destination:

  • Use a 32-bit quantity in four-part dotted-decimal format.
  • Use the any keyword as an abbreviation for the destination and destination-wildcard of 0.0.0.0 255.255.255.255.
  • Use the host destination combination as an abbreviation for a destination and destination-wildcard of destination 0.0.0.0.

destination-wildcard

Wildcard bits to be applied to the destination. There are three alternative ways to specify the destination wildcard:

  • Use a 32-bit quantity in four-part dotted-decimal format. Place ones in the bit positions you want to ignore.
  • Use the any keyword as an abbreviation for a destination and destination-wildcard of 0.0.0.0 255.255.255.255.
  • Use the host destination combination as an abbreviation for a destination and destination-wildcard of destination 0.0.0.0.

nexthop1, nexthop2, nexthop3

Specifies the next hop for this entry.

Note

 

You must specify the VRF for all nexthops unless the nexthop is in the default VRF.

precedence precedence

(Optional) Packets can be filtered by precedence level (as specified by a number from 0 to 7) or by the following names:

  • Routine —Match packets with routine precedence (0)
  • priority —Match packets with priority precedence (1)
  • immediate —Match packets with immediate precedence (2)
  • flash —Match packets with flash precedence (3)
  • flash-override —Match packets with flash override precedence (4)
  • critical —Match packets with critical precedence (5)
  • internet —Match packets with internetwork control precedence (6)
  • network —Match packets with network control precedence (7)

dscp dscp

(Optional) Differentiated services code point (DSCP) provides quality of service control. The values for dscp are as follows:

  • 0–63—Differentiated services codepoint value
  • af11—Match packets with AF11 dscp (001010)
  • af12—Match packets with AF12 dscp (001100)
  • af13—Match packets with AF13 dscp (001110)
  • af21—Match packets with AF21 dscp (010010)
  • af22—Match packets with AF22 dscp (010100)
  • af23—Match packets with AF23 dscp (010110)
  • af31—Match packets with AF31 dscp (011010)
  • af32—Match packets with AF32 dscp (011100)
  • af33—Match packets with AF33 dscp (011110)
  • af41—Match packets with AF41 dscp (100010)
  • af42—Match packets with AF42 dscp (100100)
  • af43–Match packets with AF43 dscp (100110)
  • cs1—Match packets with CS1 (precedence 1) dscp (001000)
  • cs2—Match packets with CS2 (precedence 2) dscp (010000)
  • cs3—Match packets with CS3 (precedence 3) dscp (011000)
  • cs4—Match packets with CS4 (precedence 4) dscp (100000)
  • cs5—Match packets with CS5 (precedence 5) dscp (101000)
  • cs6—Match packets with CS6 (precedence 6) dscp (110000)
  • cs7—Match packets with CS7 (precedence 7) dscp (111000)
  • default—Default DSCP (000000)
  • ef—Match packets with EF dscp (101110)

dscp range dscp dscp

(Optional) Differentiated services code point (DSCP) provides quality of service control. The values for dscp are as follows:

  • 0–63—Differentiated services codepoint value
  • af11—Match packets with AF11 dscp (001010)
  • af12—Match packets with AF12 dscp (001100)
  • af13—Match packets with AF13 dscp (001110)
  • af21—Match packets with AF21 dscp (010010)
  • af22—Match packets with AF22 dscp (010100)
  • af23—Match packets with AF23 dscp (010110)
  • af31—Match packets with AF31 dscp (011010)
  • af32—Match packets with AF32 dscp (011100)
  • af33—Match packets with AF33 dscp (011110)
  • af41—Match packets with AF41 dscp (100010)
  • af42—Match packets with AF42 dscp (100100)
  • af43–Match packets with AF43 dscp (100110)
  • cs1—Match packets with CS1 (precedence 1) dscp (001000)
  • cs2—Match packets with CS2 (precedence 2) dscp (010000)
  • cs3—Match packets with CS3 (precedence 3) dscp (011000)
  • cs4—Match packets with CS4 (precedence 4) dscp (100000)
  • cs5—Match packets with CS5 (precedence 5) dscp (101000)
  • cs6—Match packets with CS6 (precedence 6) dscp (110000)
  • cs7—Match packets with CS7 (precedence 7) dscp (111000)
  • default—Default DSCP (000000)
  • ef—Match packets with EF dscp (101110)

fragments

(Optional) Causes the software to examine noninitial fragments of IPv4 packets when applying this access list entry. When this keyword is specified, fragments are subject to the access list entry.

log

(Optional) Causes an informational logging message about the packet that matches the entry to be sent to the console. (The level of messages logged to the console is controlled by the logging console command.)

Note

 

ACL logging is supported only in ingress direction for both IPv4 and IPv6.

The message includes the access list number, whether the packet was permitted or denied; the protocol, whether it was TCP, UDP, ICMP, or a number; and, if appropriate, the source and destination addresses and source and destination port numbers. The message is generated for the first packet that matches a flow, and then at 5-minute intervals, including the number of packets permitted or denied in the prior 5-minute interval.

log-input

(Optional) Provides the same function as the log keyword, except that the log-message also includes the input interface.

ttl

(Optional) Turns on matching against time-to-life (TTL) value.

ttl value [value1 ... value2]

(Optional) TTL value used for filtering. Range is 1 to 255.

If only value is specified, the match is against this value.

If both value1 and value2 are specified, the packet TTL is matched against the range of TTLs between value1 and value2 .

icmp-type

(Optional) ICMP message type for filtering ICMP packets. Range is from 0 to 255.

icmp-code

(Optional) ICMP message code for filtering ICMP packets. Range is from 0 to 255.

igmp-type

(Optional) IGMP message type (0 to 15) or message name for filtering IGMP packets, as follows:

  • dvmrp
  • host-query
  • host-report
  • mtrace
  • mtrace-response
  • pim
  • precedence
  • trace
  • v2-leave
  • v2-report
  • v3-report

operator

(Optional) Operator is used to compare source or destination ports. Possible operands are lt (less than), gt (greater than), eq (equal), neq (not equal), and range (inclusive range).

If the operator is positioned after the source and source-wildcard values, it must match the source port.

If the operator is positioned after the destination and destination-wildcard values, it must match the destination port.

If the operator is positioned after the ttl keyword, it matches the TTL value.

The range operator requires two port numbers. All other operators require one port number.

port

Decimal number a TCP or UDP port. Range is 0 to 65535.

TCP ports can be used only when filtering TCP. UDP ports can be used only when filtering UDP.

protocol-port

Name of a TCP or UDP port. TCP and UDP port names are listed in the “Usage Guidelines” section.

TCP port names can be used only when filtering TCP. UDP port names can be used only when filtering UDP.

established

(Optional) For the TCP protocol only: Indicates an established connection.

match-any

(Optional) For the TCP protocol only: Filters on any combination of TCP flags.

match-all

(Optional) For the TCP protocol only: Filters on all TCP flags.

+ | -

(Required) For the TCP protocol match-any , match-all : Prefix flag-name with + or - . Use the + flag-name argument to match packets with the TCP flag set. Use the - flag-name argument to match packets when the TCP flag is not set.

flag-name

(Optional) For the TCP protocol match-any , match-all . Flag names are: ack , fin , psh , rst , syn , urg .

Command Default

ICMP message generation is enabled by default.

Command Modes

IPv4 access list configuration

Command History

Release

Modification

Release 7.0.12

This command was introduced.

Release 7.8.1

log-input keyword was introduced.

Release 7.5.4

bitmask keyword was introduced.

Usage Guidelines

Use the permit command following the ipv4 access-list command to specify conditions under which a packet can pass the access list.

By default, the first statement in an access list is number 10, and the subsequent statements are incremented by 10.

You can add permit , deny , or remark statements to an existing access list without retyping the entire list. To add a new statement anywhere other than at the end of the list, create a new statement with an appropriate entry number that falls between two existing entry numbers to indicate where it belongs.


Note

If any ACE in an ACL contains ABF clause, this ACL cannot be applied at any non-zero compression level.

The following is a list of precedence names:

  • critical
  • flash
  • flash-override
  • immediate
  • internet
  • network
  • priority
  • routine

The following is a list of ICMP message type names:

  • administratively-prohibited
  • alternate-address
  • conversion-error
  • dod-host-prohibited
  • dod-net-prohibited
  • echo
  • echo-reply
  • general-parameter-problem
  • host-isolated
  • host-precedence-unreachable
  • host-redirect
  • host-tos-redirect
  • host-tos-unreachable
  • host-unknown
  • host-unreachable
  • information-reply
  • information-request
  • mask-reply
  • mask-request
  • mobile-redirect
  • net-redirect
  • net-tos-redirect
  • net-tos-unreachable
  • net-unreachable
  • network-unknown
  • no-room-for-option
  • option-missing
  • packet-too-big
  • parameter-problem
  • port-unreachable
  • precedence-unreachable
  • protocol-unreachable
  • reassembly-timeout
  • redirect
  • router-advertisement
  • router-solicitation
  • source-quench
  • source-route-failed
  • time-exceeded
  • timestamp-reply
  • timestamp-request
  • traceroute
  • ttl-exceeded
  • unreachable

The following is a list of TCP port names that can be used instead of port numbers. Refer to the current Assigned Numbers RFC to find a reference to these protocols. You can find port numbers corresponding to these protocols by typing a ? in the place of a port number.

  • bgp
  • chargen
  • cmd
  • daytime
  • discard
  • domain
  • echo
  • exec
  • finger
  • ftp
  • ftp-data
  • gopher
  • hostname
  • ident
  • irc
  • klogin
  • kshell
  • login
  • lpd
  • nntp
  • pim-auto-rp
  • pop2
  • pop3
  • smtp
  • sunrpc
  • tacacs
  • talk
  • telnet
  • time
  • uucp
  • whois
  • www

The following UDP port names can be used instead of port numbers. Refer to the current Assigned Numbers RFC to find a reference to these protocols. You can find port numbers corresponding to these protocols by typing a ? in the place of a port number.

  • biff
  • bootpc
  • bootps
  • discard
  • dnsix
  • domain
  • echo
  • isakmp
  • mobile-ip
  • nameserver
  • netbios-dgm
  • netbios-ns
  • netbios-ss
  • ntp
  • pim-auto-rp
  • rip
  • snmp
  • snmptrap
  • sunrpc
  • syslog
  • tacacs
  • talk
  • tftp
  • time
  • who
  • xdmcp

Use the following flags in conjunction with the match-any and match-all keywords and the + and - signs to select the flags to display:

  • ack
  • fin
  • psh
  • rst
  • syn

For example, match-all +ack +syn displays TCP packets with both the ack and syn flags set, or match-any +ack – - syn displays the TCP packets with the ack set or the syn not set.

Task ID

Task ID

Operations

ipv4

read, write

acl

read, write

Examples

The following example shows how to set a permit condition for an access list named Internetfilter: 


Router(config)# ipv4 access-list Internetfilter
Router(config-ipv4-acl)# 10 permit 192.168.34.0 0.0.0.255
Router(config-ipv4-acl)# 20 permit 172.16.0.0 0.0.255.255
Router(config-ipv4-acl)# 25 permit tcp host 172.16.0.0 eq bgp host 192.168.202.203 range 1300 1400
Router(config-ipv4-acl)# deny 10.0.0.0 0.255.255.255

Examples

This example shows how you can configure DSCP bitmask on ingress ERSPAN.

Router# config
Router(config)# ipv4 access-list acl1
Router(config-ipv4-acl)# 10 permit ipv4 host 192.0.2.1 any dscp af22 bitmask 0x3f
Router(config-ipv4-acl)# commit
Router(config-ipv4-acl)# exit
Router(config)# interface HundredGigE0/0/0/6
Router(config-if)# ipv4 address 192.0.2.51 255.255.255.0
Router(config-if)# monitor-session TEST ethernet direction rx-only port-level acl ipv4 acl1
Router(config-if)# commit

permit (IPv6)

To set permit conditions for an IPv6 access list, use the permit command in IPv6 access list configuration mode. To remove the permit conditions, use the no form of this command.

[sequence-number] permit source { source-ipv6-prefix/ prefix-length | any | host source-ipv6-address ipv6-wildcard-mask/prefix-length } [ operator { port | protocol-port } ] [ dscp value [ bitmask value ] ] [ routing ] [ hop-by-hop ] [ authen ] [ destopts ] [ fragments ] [ packet-length operator packet-length value ] [ log | log-input ]

[sequence-number] permit protocol { source-ipv6-prefix/ prefix-length | any | host source-ipv6-address ipv6-wildcard-mask/prefix-length } { source-ipv6-prefix/ prefix-length | any | host source-ipv6-address } [ operator { port | protocol-port } ] [ dscp value [ bitmask value ] ] [ routing ] [ hop-by-hop ] [ authen ] [ destopts ] [ fragments ] [ packet-length operator packet-length value ] [ log | log-input ]

[ ttl ttl value [ value1 . . . value2 ] ]

no sequence-number

Internet Control Message Protocol (ICMP)

[ sequence-number] permit icmp {source-ipv6-prefix/ prefix-length | any | host source-ipv6-address ipv6-wildcard-mask/prefix-length} {source-ipv6-prefix/ prefix-length | any | host source-ipv6-address } {destination-ipv6-prefix/ prefix-length | any | host destination-ipv6-address ipv6-wildcard-mask/prefix-length}[ icmp-type] [ icmp-code][ dscp value] [ routing] [ hop-by-hop] [ authen] [ destopts] [ fragments] [ log]

Transmission Control Protocol (TCP)

[sequence-number] permit tcp {source-ipv6-prefix/ prefix-length | any | host source-ipv6-address ipv6-wildcard-mask/prefix-length}[ operator {port | protocol-port}] {destination-ipv6-prefix/ prefix-length | any | host destination-ipv6-address ipv6-wildcard-mask/prefix-length}[ operator {port | protocol | port}] [ dscp value] [ routing] [ hop-by-hop] [ authen] [ destopts] [ fragments] [ established] {match-any | match-all | + | -}[ flag-name] [ log]

User Datagram Protocol (UDP)

[sequence-number] permit tcp {source-ipv6-prefix/ prefix-length | any | host source-ipv6-address ipv6-wildcard-mask/prefix-length}[ operator {port | protocol-port}] {destination-ipv6-prefix/ prefix-length | any | host destination-ipv6-address ipv6-wildcard-mask/prefix-length}[ operator {port | protocol | port}] [ dscp value] [ routing] [ hop-by-hop] [ authen] [ destopts] [ fragments] [ established] [ flag-name] [ log]

Syntax Description

sequence-number

(Optional) Number of the permit statement in the access list. This number determines the order of the statements in the access list. Range is from 1 to 2147483644. (By default, the first statement is number 10, and the subsequent statements are incremented by 10.)

protocol

Name or number of an Internet protocol. It can be one of the keywords ahp , esp , gre , icmp , igmp , igrp , isinip , ipv6 , nos , ospf , pcp , sctp , tcp , or udp , or an integer that ranges from 0 to 255, representing an IPv6 protocol number.

source-ipv6-prefix / prefix-length

Source IPv6 network or class of networks about which permit conditions are to be set.

This argument must be in the form documented in RFC 2373, where the address is specified in hexadecimal using 16-bit values between colons.

any

An abbreviation for the IPv6 prefix ::/0.

host source-ipv6-address

Source IPv6 host address about which to set permit conditions.

This source-ipv6-address argument must be in the form documented in RFC 2373 where the address is specified in hexadecimal using 16-bit values between colons.

ipv6-wildcard-mask

IPv6 wildcard mask. The IPv6 wildcard mask can take any IPv6 address value which is used instead of prefix length.

operator {port | protocol-port}

(Optional) Operand that compares the source or destination ports of the specified protocol. Operands are lt (less than), gt (greater than), eq (equal), neq (not equal), and range (inclusive range).

If the operator is positioned after the source-ipv6-prefix / prefix-length argument, it must match the source port.

If the operator is positioned after the destination-ipv6-prefix / prefix-length argument, it must match the destination port.

The range operator requires two port numbers. All other operators require one port number.

The port argument is the decimal number of a TCP or UDP port. A port number is a number whose range is from 0 to 65535. The protocol-port argument is the name of a TCP or UDP port. TCP port names can be used only when filtering TCP. UDP port names can be used only when filtering UDP.

destination-ipv6-prefix / prefix-length

Destination IPv6 network or class of networks about which permit conditions are to be set.

This argument must be in the form documented in RFC 2373, where the address is specified in hexadecimal using 16-bit values between colons.

host destination-ipv6-address

Specifies the destination IPv6 host address about which permit conditions are to be set.

This destination-ipv6-address argument must be in the form documented in RFC 2373, where the address is specified in hexadecimal using 16-bit values between colons.

dscp value

(Optional) Matches a differentiated services code point (DSCP) value against the traffic class value in the Traffic Class field of each IPv6 packet header. Range is from 0 to 63.

routing

(Optional) Matches source-routed packets against the routing extension header within each IPv6 packet header.

hop-by-hop

(Optional) Supports Jumbo-grams. With the Router Alert option, it is an integral part in the operation of Multicast Listener Discovery (MLD). Router Alert [3] is an integral part in the operations of IPv6 Multicast through MLD and RSVP for IPv6.

authen

(Optional) Matches if the IPv6 authentication header is present.

destopts

(Optional) Matches if the IPv6 destination options header is present.

fragments

(Optional) Matches noninitial fragmented packets where the fragment extension header contains a nonzero fragment offset. The fragments keyword is an option available only if the operator [ port-number ] arguments are not specified.

log

(Optional) Causes an informational logging message about the packet that matches the entry to be sent to the console. (The level of messages logged to the console is controlled by the logging console command.)

Note

 

ACL logging is supported only in ingress direction for both IPv4 and IPv6.

The message includes the access list name and sequence number, and whether the packet is permitted; the protocol, and whether it is TCP, UDP, ICMP, or a number; and, if appropriate, the source and destination addresses and source and destination port numbers. The message is generated for the first matching packet, and then at 5-minute intervals, including the number of packets permitted in the prior 5-minute interval.

log-input

(Optional) Provides the same function as the log keyword, except that the log-message also includes the input interface.

ttl

(Optional) Turns on matching against time-to-life (TTL) value. For IPv6 packets, ttl is also referred to as hop limit.

ttl value [value1 ... value2]

(Optional) TTL value used for filtering. Range is 1 to 255.

If only value is specified, the match is against this value.

If both value1 and value2 are specified, the packet TTL is matched against the range of TTLs between value1 and value2 .

operator

(Optional) Operand that compares the source or destination ports of the specified protocol. Operands are lt (less than), gt (greater than), eq (equal), neq (not equal), and range (inclusive range).

icmp-type

(Optional) ICMP message type for filtering ICMP packets. Range is from 0 to 255.

icmp-code

(Optional) ICMP message code for filtering ICMP packets. Range is from 0 to 255.

established

(Optional) For the TCP protocol only: Indicates an established connection.

match-any

(Optional) For the TCP protocol only: Filters on any combination of TCP flags.

match-all

(Optional) For the TCP protocol only: Filters on all TCP flags.

+ | -

(Required) For the TCP protocol match-any , match-all : Prefix flag-name with + or - . Use the + flag-name argument to match packets with the TCP flag set. Use the - flag-name argument to match packets when the TCP flag is not set.

flag-name

(Required) For the TCP protocol match-any , match-all . Flag names are: ack , fin , psh , rst , syn , urg .

Command Default

ICMP message generation is enabled by default.

Command Modes

IPv6 access list configuration

Command History

Release

Modification

Release 7.0.12

This command was introduced.

Release 7.2.1

Ingress IPv6 TCP flags are supported.

Release 7.3.15

Egress IPv6 TCP flags are supported.

Release 7.8.1

log-input keyword was introduced.

Release 7.8.1

ttl keyword was introduced.

Release 7.5.4

bitmask keyword was introduced.

Release 7.10.1

IPv6 AHP and ESP headers are supported.

Usage Guidelines

The permit (IPv6) command is similar to the permit (IPv4) command, except that it is IPv6-specific.

Use the permit (IPv6) command following the ipv6 access-list command to define the conditions under which a packet passes the access list.

Specifying ipv6 for the protocol argument matches against the IPv6 header of the packet.

By default, the first statement in an access list is number 10, and the subsequent statements are numbered in increments of 10.

You can add permit , deny, or remark statements to an existing access list without retyping the entire list. To add a new statement anywhere other than the end of the list, create a new statement with an appropriate entry number that falls between two existing entry numbers to indicate where it belongs.

Both the source-ipv6-prefix/prefix-length and destination-ipv6-prefix/prefix-length arguments are used for traffic filtering (the source prefix filters traffic based upon the traffic source; the destination prefix filters traffic based upon the traffic destination).


Note

IPv6 prefix lists, and not access lists, should be used for filtering routing protocol prefixes.

The fragments keyword is an option available only if the operator [port | protocol-port ] arguments are not specified.

Task ID

Task ID

Operations

acl

read, write

Examples

This example shows how to configure the IPv6 access list named v6-abf-acl and apply the access list to inbound traffic on HundredGigE interface 0/0/2/0. 



Router(config)# ipv6 access-list v6-abf-acl
Router(config-ipv6-acl)# 10 permit ipv6 any any
Router(config-ipv6-acl)# 20 permit ipv4 any any
Router(config)# interface HundredGigE 0/0/2/0 
Router(config-if)# ipv6 access-group v6-abf-acl ingress

Examples

The following example shows how to configure the IPv6 access list named toCISCO and apply the access list to the traffic entering theHundredGigE interface 0/2/0/2. Specifically, the permit entry in the list allows all packets that have a hop-by-hop optional field from entering the HundredGigE interface 0/2/0/2. 



Router(config)# ipv6 access-list toCISCO
Router(config-ipv6-acl)# permit ipv6 any any hop-by-hop
Router(config)#  interface HundredGigE 0/2/0/2
Router(config-if)# ipv6 access-group tOCISCO ingress

Examples

The following example shows how you can configure DSCP bitmask on ingress ERSPAN.

Router# config
Router(config)# ipv6 access-list acl1 
Router(config-ipv6-acl)# 10 permit ipv6 host 2001:DB8::2/32 any dscp 33 bitmask 0x3f
Router(config-ipv6-acl)# commit
Router(config-ipv6-acl)# exit
Router(config)# interface HundredGigE 0/0/10/3
Router(config-if)# ipv6 address 2001:DB8::1/32
Router(config-if)# monitor-session TEST ethernet direction rx-only port-level acl ipv6 acl1
Router(config-if)# commit

Examples

The following example shows how you can configure AHP and ESP headers on an ACLs.
Router(config)# #ipv6 access-list ipv6_umpp_access_list
Router(config-ipv6-acl)# 12 permit ahp any any
Router(config-ipv6-acl)# ipv6 access-list ipv6_umpp_access_list
Router(config-ipv6-acl)# 14 permit esp any any
Router(config-ipv6-acl)# commit 
Router(config-ipv6-acl)# exit

show access-lists ipv4

To display the contents of current IPv4 access lists, use the show access-lists ipv4 command in XR EXEC mode.

show access-lists ipv4 [access-list-name hardware {ingress | egress} [interface type interface-path-id] {sequence number | location node-id | [usage pfilter { location node-id }]}]

Syntax Description

access-list-name

(Optional) Name of a particular IPv4 access list. The name cannot contain spaces or quotation marks, but can include numbers.

hardware

(Optional) Identifies the access list as an access list for an interface.

ingress

(Optional) Specifies an inbound interface.

interface

(Optional) Displays interface statistics.

type

(Optional) Interface type. For more information, use the question mark (?) online help function.

interface-path-id

Physical interface or virtual interface.

Note

 

Use the show interfaces command to see a list of all interfaces currently configured on the router.

For more information about the syntax for the router, use the question mark (?) online help function.

sequence number

(Optional) Sequence number of a particular IPv4 access list. Range is 1 to 2147483644.

location node-id

(Optional) Location of a particular IPv4 access list. The node-id argument is entered in the rack/slot/module notation.

summary

(Optional) Displays a summary of all current IPv4 access lists.

sequence-number

(Optional) Sequence number of a particular IPv4 access list. Range is 1 to 2147483644.

usage

(Optional) Displays the usage of the access list on a given line card.

pfilter

(Optional) Displays the packet filtering usage for the specified line card.

Command Default

The default displays all IPv4 access lists.

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 7.0.12

This command was introduced.

Usage Guidelines

Use the show access-lists ipv4 command to display the contents of all IPv4 access lists. To display the contents of a specific IPv4 access list, use the name argument. Use the sequence-number argument to specify the sequence number of the access list.

Use the hardware , ingress and location keywords to display the access list hardware contents and counters for all interfaces that use the specified access list in a given direction. To display the contents of a specific access list entry, use the sequence number keyword and argument. The access group for an interface must be configured using the ipv4 access-group command for access list hardware counters to be enabled.

Use the show access-lists ipv4 summary command to display a summary of all current IPv4 access lists. To display a summary of a specific IPv4 access list, use the name argument.

Use the show access-list ipv4 usage command to display a summary of all interfaces and access lists programmed on the specified line card.

Task ID

Task ID

Operations

acl

read

Examples

In the following example, the contents of all IPv4 access lists are displayed: 


Router# show access-lists ipv4

ipv4 access-list test_ipv4
 10 permit ipv4 any any
 20 deny tcp any eq 2000 any eq 2000
 30 permit tcp any eq 3000 any eq 3000

This table describes the significant fields shown in the display.

Table 1. show access-lists ipv4 hardware Field Descriptions

Field

Description

hw matches

Number of hardware matches.

ACL name

Name of the ACL programmed in hardware.

Sequence Number

Each ACE sequence number is programmed into hardware with all the fields that are corresponding to the values set in ACE.

Grant

Depending on the ACE rule, the grant is set to deny, permit, or both.

Logging

Logging is set to on if ACE uses a log option to enable logs.

Per ace icmp

If Per ace icmp is set to on in the hardware, ICMP is unreachable, is rate-limited, and is generated. The default is set to on.

Hits

Hardware counter for that ACE.

In the following example, a summary of all IPv4 access lists are displayed: 


Router# show access-lists ipv4 summary

ACL Summary:
  Total ACLs configured: 3
  Total ACEs configured: 11

This table describes the significant fields shown in the display.

Table 2. show access-lists ipv4 summary Field Descriptions

Field

Description

Total ACLs configured

Number of configured IPv4 ACLs.

Total ACEs configured

Number of configured IPV4 ACEs.

This example displays the packet filtering usage for the specified line card: 


Router# show access-lists ipv4 usage pfilter location 0/RP0/CPU0
    
 Interface : HundredGigE0/0/0/10/0
Input ACL : Common-ACL : N/A ACL : test_ipv4
Output ACL : N/A

Note

To display the packet filtering usage for bundle interfaces, use the show access-lists ipv4 usage pfilter location all command.

show access-lists ipv6

To display the contents of current IPv6 access lists, use the show access-lists ipv6 command in XR Config mode.

show access-lists ipv6 [access-list-name hardware {ingress | egress} [interface type interface-path-id] {sequence number | location node-id | [usage pfilter { location node-id }]}]

Syntax Description

access-list-name

(Optional) Name of a particular IPv6 access list. The name cannot contain a spaces or quotation marks, but can include numbers.

hardware

(Optional) Identifies the access list as an access list for an interface.

ingress

(Optional) Specifies an inbound interface.

interface

(Optional) Displays interface statistics.

type

(Optional) Interface type. For more information, use the question mark (?) online help function.

interface-path-id

(Optional) Either a physical interface instance or a virtual interface instance as follows:

  • Physical interface instance. Naming notation is rack/slot/module/port and a slash between values is required as part of the notation.

    • rack: Chassis number of the rack.

    • slot: Physical slot number of the modular services card or line card.

    • module: Module number. A physical layer interface module (PLIM) is always 0.

    • port: Physical port number of the interface.

    Note

     

    In references to a Management Ethernet interface located on a route processor card, the physical slot number is alphanumeric (RSP0) and the module is CPU0. Example: interface MgmtEth0/RSP0/CPU0/0.

  • Virtual interface instance. Number range varies depending on interface type.

For more information about the syntax for the router, use the question mark (?) online help function.

sequence number

(Optional) Sequence number of a particular IPv6 access list. Range is 1 to 2147483644.

location node-id

(Optional) Location of a particular IPv6 access list. The node-id argument is entered in the rack/slot/module notation.

summary

(Optional) Displays a summary of all current IPv6 access lists.

sequence-number

(Optional) Sequence number of a particular IPv6 access list. Range is 1 to 2147483644.

usage

(Optional) Displays the usage of the access list on a given line card.

pfilter

(Optional) Displays the packet filtering usage for the specified line card.

all

(Optional) Displays the location of all the line cards.

Command Default

Displays all IPv6 access lists.

Command Modes

XR Config mode

Command History

Release

Modification

Release 7.0.12

This command was introduced.

Usage Guidelines

The show access-lists ipv6 command is similar to the show access-lists ipv4 command, except that it is IPv6 specific.

Use the show access-lists ipv6 command to display the contents of all IPv6 access lists. To display the contents of a specific IPv6 access list, use the name argument. Use the sequence-number argument to specify the sequence number of the access list.

Use the hardware , ingress and location keywords to display the access list hardware contents and counters for all interfaces that use the specified access list in a given direction. To display the contents of a specific access list entry, use the sequence number keyword and argument. The access group for an interface must be configured using the ipv6 access-group command for access list hardware counters to be enabled.

Use the show access-lists ipv6 summary command to display a summary of all current IPv6 access lists. To display a summary of a specific IPv6 access list, use the name argument.

Use the show access-list ipv6 usage command to display a summary of all interfaces and access lists programmed on the specified line card.

Task ID

Task ID

Operations

acl

read

Examples

In the following example, the IPv6 ACL is configured with the source IPv6 wildcard mask FF:0:FFFF:AA:20 and the destination wildcard mask 0:FFFF:2233::FFFF, the show command displays these wildcard mask: 

Router# config
Router(config)# ipv6  access-list acl1
Router(config-ipv6-acl)# permit 1:2::3 FF:0:FFFF:AA:20:: 4:5::6 0:FFFF:2233::FFFF 
Router(config-ipv6-acl)# commit 
Router# show run ipv6 access-list
ipv6 access-list ACL1
 10 permit ipv6 1:2::3 ff:0:ffff:aa:20:: 4:5::6 0:ffff:2233::ffff

In the following example, the contents of all IPv6 access lists are displayed: 


Router# show access-lists ipv6

ipv6 access-list test_ipv6
 10 permit ipv6 any any
 20 permit tcp any eq 3000 any eq 3000

In the following example, the contents of an access list named Internetfilter is displayed: 


Router# show access-lists ipv6 Internetfilter

ipv6 access-list Internetfilter
  3 remark Block BGP traffic from a given host
  4 deny tcp host 6666:1:2:3::10 eq bgp host 7777:1:2:3::20 range 1300 1404 deny tcp host 171.69.2.88 255.255.0.0 any eq telnet
  20 permit ipv6 3333:1:2:3::/64 any
  25 permit ipv6 4444:1:2:3::/64 any
  30 permit ipv6 5555:1:2:3::/64 any

This table describes the significant fields shown in the display.

Table 3. show access-lists ipv6 hardware Command Field Descriptions

Field

Description

hw matches

Number of hardware matches.

In the following example, a summary of all IPv6 access lists is displayed: 


Router# show access-lists ipv6 summary

ACL Summary:
  Total ACLs configured: 3
  Total ACEs configured: 11

This table describes the significant fields shown in the display.

Table 4. show access-lists ipv6 summary Command Field Descriptions

Field

Description

Total ACLs configured

Number of configured IPv6 ACLs.

Total ACEs configured

Number of configured IPV6 ACEs.

In the following example, the OOR details of the IPv6 access lists are displayed: 


Router# show access-lists ipv6 maximum detail

Default max configurable acls :1000
Default max configurable aces :50000
Current configured acls       :1
Current configured aces       :2
Current max configurable acls :1000
Current max configurable aces :50000
Max configurable acls         :2000
Max configurable aces         :100000
This example displays the packet filtering usage for the specified line card: 


Router# show access-lists ipv6 usage pfilter location 0/0/CPU0

Interface : HundredGigE0/0/0/10/0 
    Input  ACL : Common-ACL : N/A  ACL : test_ipv6  
    Output ACL : N/A

This example displays the ABF ACL match counter statistics when the show access-lists ipv6 command is used with the hardware option. 

Router# show access-lists ipv6 abf_1_v6 hardware ingress location 0/RP0/CPU0

Fri Sep 27 17:18:19.288 PDT
ipv6 access-list abf_1_v6
 5 permit ipv6 any 2001:150:25:207::/64 (1883512876 matches) (next-hop: addr=2620:149:bb:3210::90, vrf name=default)
 10 permit ipv6 any any (153796235 matches)

show tech-support access-lists

To automatically collect information about Ethernet Services, IPV4, IPV6, and Platform dependent ACL related information, use the show tech-support access-lists command in configuration mode.

show tech-support access-lists { ethernet-services | ipv4 | ipv6 | platform }

Syntax Description

ethernet-services

Collects information regarding the ethernet-services access lists in the router.

ipv4

Collects information regarding the ipv4 access lists in the router.

ipv6

Collects information regarding the ipv6 access lists in the router.

platform

Collects information regarding the platform specific access lists in the router.

Command Default

None

Command Modes

Configuration mode

Command History

Release

Modification

Release 7.0.12

This command was introduced.

Usage Guidelines

  • To use commands, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using any command, contact your AAA administrator for assistance.

  • This command generates tech-support information that is useful for Cisco Technical Support representatives when troubleshooting a router. By default, the output of this command is saved on the router's hard disk in a file with .tgz extension. You can share this file with Cisco Technical Support. To share, use the copy command to copy the .tgz file to a server or local machine. For example, copy harddisk:/showtech/ name.tgz tftp:// server_path .

  • This command is not required during normal use of the router.

Task ID

Task ID

Operations

acl

read

Examples

The following example shows the output of the show tech-support access-lists command: 


Router# show tech-support access-lists ipv4 
Thu Oct 20 10:38:18.041 PDT
++ Show tech start time: 2022-Oct-20.103818.PDT ++
Thu Oct 20 10:38:18 PDT 2022 Waiting for gathering to complete
.....
Thu Oct 20 10:38:33 PDT 2022 Compressing show tech output
Show tech output available at 0/RP0/CPU0 : /harddisk:/showtech/showtech-M8102TOR1-ipv4-acl-2022-Oct-20.103818.PDT.tgz
++ Show tech end time: 2022-Oct-20.103833.PDT ++

tcam format access-list (ipv4 and ipv6)

To configure the object group ACLs for IPv4 and IPv6 using the user-defined TCAM keys (UDK), use the hw-module profile tcam format access-list ipv4 command and hw-module profile tcam format access-list ipv6 in XR Config mode.

Syntax for IPv4:

hw-module profile tcam format access-list ipv4

Syntax Description

dst-addr

Specifies destination address. This is a 32-bit qualifier for IPv4 ACLs.

dst-object-group

Specifies the destination object group.

dst-port

Destination port for TCP/UDP. This is a 16-bit qualifier.

frag-bit

Fragmentation bit for IPv4 ACLs. This is a 1-bit qualifier.

fragment-offset

Specifies the fragment offset for IPv4 ACLs.

packet-len

Specifies packet length for IPv4 ACLs. This is a 10-bit qualifier.

precedence

Specifies DSCP precedence in IPv4 header. This is a 10-bit qualifier.

proto

Specifies protocol type in IPv4 header. This is an 8-bit qualifier.

src-addr

Specifies source address. This is a 32-bit qualifier for IPv4 ACLs.

src-object-group

Specifies the source object group.

src-port

Specifies source port for TCP/UDP. This is a 16-bit qualifier.

tcp-flags

Specifies TCP Flags. This is a 6-bit qualifier for IPv4 ACLs.

Syntax for IPv6:

hw-module profile tcam format access-list ipv6

Syntax Description

dst-addr

Specifies destination address. This is a 128-bit qualifier for IPv6 ACLs.

dst-object-group

Specifies the destination object group.

dst-port

Destination port for TCP/UDP. This is a 16-bit qualifier.

frag-bit

Fragmentation bit for IPv6 ACLs. This is a 1-bit qualifier.

next-hdr

(Mandatory) Specifies the next header field in IPv6 header. This is an 8-bit qualifier.

packet-len

Specifies packet length for IPv6 ACLs. This is a 10-bit qualifier.

src-addr

Specifies source address. This is a 128-bit qualifier for IPv6 ACLs.

src-object-group

Specifies the source object group.

src-port

(Mandatory) Specifies source port for TCP/UDP. This is a 16-bit qualifier.

tcp-flags

Specifies TCP Flags. This is an 8-bit qualifier for IPv6 ACLs.

traffic-class

Specifies traffic class in IPv6 header. This is an 8-bit qualifier for IPv6 ACLs.

Command Default

None

Command Modes

XR Config mode

Command History

Release

Modification

Release 24.2.1

These commands were introduced.

Usage Guidelines

  • Remove all ACL attachments to interfaces before the IPv4/IPv6 UDK configuration.

  • Make sure that you reload the line card for this configuration to take effect.

Task ID

Task ID

Operations

acl

read, write

ipv4

read, write

ipv6

read, write

Examples

Example 1: In UDK, if only the dst-object-group is specified and the src-object-group is not specified, you compress only the destination address (compress level 4) as shown in this example. 

Router(config)# hw-module profile tcam format access-list ipv4 src-addr src-port dst-port proto tcp-flags frag-bit dst-object-group
Router(config)# hw-module profile tcam format access-list ipv6 src-addr src-port dst-port next-hdr frag-bit tcp-flags dst-object-group  
interface FH0/0/0/1
 RP/0/RP0/CPU0:ios(config-if)#ipv6 access-group v6-test ingress compress level 4
Example 2: In UDK, if only the src-object-group is specified and the dst-object-group is not specified, you compress only the source address (compress level 1) as shown in this example. 

Router(config)# hw-module profile tcam format access-list ipv4 src-object-group src-port dst-port proto tcp-flags frag-bit dst-addr
Router(config)# hw-module profile tcam format access-list ipv6 src-object-group src-port dst-port next-hdr frag-bit tcp-flags dst-addr 
interface FH0/0/0/1
 RP/0/RP0/CPU0:ios(config-if)#ipv4 access-group v4-test ingress compress level 1

Note

By default, compression level 2 is supported for both the src-object-group and dst-object-group without the UDK configuration.