SSM Channel Based Filtering for Multicast Boundaries

Last Updated: December 21, 2011

The SSM Channel Based Filtering for Multicast Boundaries feature enables the user to apply filtering policies based on Source Specific Multicast (SSM) channels for Source and Group (S,G) addresses, which is a combination of source and destination IP addresses.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.

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Prerequisites for SSM Channel Based Filtering for Multicast Boundaries

  • IP multicast needs to be configured on the router.

Restrictions for SSM Channel Based Filtering for Multicast Boundaries

  • The filter-autorp keyword does not support extended access lists.

Information About the SSM Channel Based Filtering for Multicast Boundaries Feature

Rules for Multicast Boundaries

The SSM Channel Based Filtering for Multicast Boundaries feature expands the ip multicast boundary command for control plane filtering support. More than one ip multicast boundary command can be applied to an interface.

The following rules govern the ip multicast boundary command:

  • One instance of the in and out keywords can be configured on an interface.
  • The in and out keywords can be used for standard or extended access lists.
  • Only standard access lists are permitted with the use of the filter-autorp keyword or no keyword.
  • A maximum of three instances of a command will be allowed on an interface: one instance of in, one instance of out, and one instance of filter-autorp or no keyword.
  • When multiple instances of the command are used, the filtering will be cumulative. If a boundary statement with no keyword exists with a boundary statement with the inkeyword, both access lists will be applied on the in direction and a match on either one will be sufficient.
  • All instances of the command apply to both control and data plane traffic.
  • Protocol information on the extended access list is parsed to allow reuse and filtering for Cisco IOS XE consistency. An (S,G) operation will be filtered by an extended access list under all conditions stated above for keywords if the access list filters (S,G) traffic for all protocols.

Benefits of SSM Channel Based Filtering for Multicast Boundaries

  • This feature allows input on the source interface.
  • The access control capabilities are the same for SSM and Any Source Multicast (ASM).

How to Configure SSM Channel Based Filtering for Multicast Boundaries

Configuring the Multicast Boundaries

Perform this task to configure the multicast boundary.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    ip access-list {standard| extended} access-list-name

4.    permit protocol host address host address

5.    deny protocol host address host address

6.    Repeat Step 4 or Step 5 as needed.

7.    interface type interface-number port -number

8.    ip multicast boundary access-list-name [in| out | filter-autorp]


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
ip access-list {standard| extended} access-list-name


Example:

Router(config)# ip access-list 101

 

Configures the standard or extended access list.

 
Step 4
permit protocol host address host address


Example:

Router(config-ext-nacl)# permit ip host 181.1.2.201 host 232.1.1.11

 

Permits specified ip host traffic.

 
Step 5
deny protocol host address host address


Example:

Router(config-acl-nacl)# deny ip host 181.1.2.203 host 232.1.1.1

 

Denies specified multicast ip group and source traffic.

 
Step 6
Repeat Step 4 or Step 5 as needed. 

Permits and denies specified host and source traffic.

 
Step 7
interface type interface-number port -number


Example:

Router(config)# interface gigabitethernet 2/3/0

 

Enables interface configuration mode.

 
Step 8
ip multicast boundary access-list-name [in| out | filter-autorp]


Example:

Router(config-if)# ip multicast boundary acc_grp1 out

 

Configures the multicast boundary.

 

Configuration Examples for SSM Channel Based Filtering for Multicast Boundaries

Configuring the Multicast Boundaries Permitting and Denying Traffic Example

The following example permits outgoing traffic for (181.1.2.201, 232.1.1.1) and (181.1.2.202, 232.1.1.1) and denies all other (S,G)s.

configure terminal
 ip access-list extended acc_grp1
 permit ip host 0.0.0.0 232.1.1.1 0.0.0.255
 permit ip host 181.1.2.201 host 232.1.1.1
 permit udp host 181.1.2.202 host 232.1.1.1
 permit ip host 181.1.2.202 host 232.1.1.1
 deny igmp host 181.2.3.303 host 232.1.1.1
 interface gigabitethernet 2/3/0
 ip multicast boundary acc_grp1 out

Configuring the Multicast Boundaries Permitting Traffic Example

The following example permits outgoing traffic for (192.168.2.201, 232.1.1.5) and 192.168.2.202, 232.1.1.5).

configure terminal
ip access-list extended acc_grp6
 permit ip host 0.0.0.0 232.1.1.1 5.0.0.255
 deny udp host 192.168.2.201 host 232.1.1.5
 permit ip host 192.168.2.201 host 232.1.1.5
 deny pim host 192.168.2.201 host 232.1.1.5
 permit ip host 192.168.2.202 host 232.1.1.5
 deny igmp host 192.2.3.303 host 232.1.1.1
interface gigabitethernet 2/3/0
 ip multicast boundary acc_grp6 out

Configuring the Multicast Boundaries Denying Traffic Example

The following example denies a group-range that is being announced by the candidate RP. Since the group range is denied, there will be no pim auto-rp mappings created.

configure terminal
ip access-list standard acc_grp10
 deny 225.0.0.0 0.255.255.255
 permit any
 access-list extended acc_grp12
 permit pim host 181.1.2.201 host 232.1.1.8
 deny udp host 181.1.2.201 host 232.1.1.8
 permit pim host 181.1.2.203 0.0.0.255 host 227.7.7.7
 permit ip host 0.0.0.0 host 227.7.7.7
 permit ip 181.1.2.203 0.0.0.255 host 227.7.7.7
 permit ip host 181.1.2.201 host 232.1.1.7
ip access-list extended acc_grp13
 deny ip host 181.1.2.201 host 232.1.1.8
 permit ip any any
interface gigabitethernet 2/3/0
 ip multicast boundary acc_grp10 filter-autorp
 ip multicast boundary acc_grp12 out
 ip multicast boundary acc_grp13 in

Additional References

Related Documents

Related Topic

Document Title

IP multicast commands: complete syntax, command mode, defaults, usage guidelines, and examples

Cisco IOS IP Multicast Command Reference

Standards

Standards

Title

No new or modified standards are supported by this feature.

--

MIBs

MIBs

MIBs Link

To locate and download MIBs for selected platforms, Cisco IOS XE releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs

RFCs

RFCs

Title

No new or modified RFCs are supported by this feature.

--

Technical Assistance

Description

Link

The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies.

To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds.

Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.

http://www.cisco.com/techsupport

Feature Information for SSM Channel Based Filtering for Multicast Boundaries

The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.

Table 1 Feature Information for SSM Channel Based Filtering for Multicast Boundaries

Feature Name

Releases

Feature Information

SSM Channel Based Filtering for Multicast Boundaries

Cisco IOS XE Release 2.1

The SSM Channel Based Filtering for Multicast Boundaries feature enables the user to apply filtering policies based on Source Specific Multicast (SSM) channels for Source and Group (S,G) addresses, which is a combination of source and destination IP addresses.

The following command was introduced or modified:

  • ip multicast boundary

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Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.

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