Implementing Multicast Routing on Cisco IOS XR Software Cisco ASR 9000 Series Routers
How to Implement Multicast Routing
MCC-25
Multicast Configuration Guide
OL-
PIM-SSM Operations
PIM in Source-Specific Multicast operation uses information found on source addresses for a multicast
group provided by receivers and performs source filtering on traffic.
• By default, PIM-SSM operates in the 232.0.0.0/8 multicast group range for IPv4 and ff3x::/32
(where x is any valid scope) in IPv6. To configure these values, use the ssm range command.
• If SSM is deployed in a network already configured for PIM-SM, only the last-hop routers must be
upgraded with Cisco
IOS XR software that supports the SSM feature.
• No MSDP SA messages within the SSM range are accepted, generated, or forwarded.
For more information about PIM-SSM, see the “PIM-Source Specific Multicast” section on
page MCC-7.
Restrictions for PIM-SM and SSM
Interoperability with SSM
PIM-SM operations within the SSM range of addresses change to PIM-SSM. In this mode, only PIM
(S,G) join and prune messages are generated by the router, and no (S,G) RP shared tree or (*,G) shared
tree messages are generated.
IGMP Version
To report multicast memberships to neighboring multicast routers, hosts use IGMP and all routers on the
subnet must be configured with the same version of IGMP.
A router running Cisco IOS XR software does not automatically detect Version 1 systems. You must use
the version command in router IGMP configuration submode to configure the IGMP version.
MLD Version
To report multicast memberships to neighboring multicast routers, routers use MLD, and all routers on
the subnet must be configured with the same version of MLD.
SUMMARY STEPS
1. configure
2. multicast-routing [address-family {ipv4 | ipv6}]
3. interface all enable
4. exit
5. router {igmp | mld}
6. version {1 | 2 | 3}
7. end
or
commit
8. show pim [ipv4 | ipv6] group-map [ip-address-name] [info-source]
9. show pim [vrf vrf-name] [ipv4 | ipv6] topology [source-ip-address [group-ip-address] | entry-flag
flag | interface-flag | summary] [route-count]
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