SSM Channel Based Filtering for Multicast Boundaries

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 caveats and feature information, see Bug Search Tool and 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 module.

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Prerequisites for SSM Channel Based Filtering for Multicast Boundaries

IP multicast is enabled on the device using the tasks described in the "Configuring Basic IP Multicast" module of the IP Multicast: PIM Configuration Guide.

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 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 Multicast Boundaries

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: 
    Device> enable
     

    Enables privileged EXEC mode.

     
    Step 2 configure terminal


    Example: 
    Device# configure terminal
     

    Enters global configuration mode.

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


    Example: 
    Device(config)# ip access-list 101
     

    Configures the standard or extended access list.

     
    Step 4 permit protocol host address host address


    Example: 
    Device(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: 
    Device(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: 
    Device(config)# interface gigabitethernet 2/3/0
     

    Enables interface configuration mode.

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


    Example: 
    Device(config-if)# ip multicast boundary acc_grp1 out
     
    Configures the multicast boundary.
    Note   

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

     

    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 announced by the candidate RP. Because the group range is denied, no pim auto-rp mappings are 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

    Cisco IOS commands

    Cisco IOS Master Commands List, All Releases

    Cisco IOS IP Multicast commands

    Cisco IOS IP Multicast Command Reference

    MIBs

    MIB

    MIBs Link

    No new or modified MIBs are supported by this feature, and support for existing standards has not been modified by this feature.

    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

    Technical Assistance

    Description

    Link

    The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

    http:/​/​www.cisco.com/​cisco/​web/​support/​index.html

    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