[Contents]
[Prev]
[Next]
[Index]
[Report an Error]
Configuring SSM Mapping
Source-specific multicast (SSM) mapping enables
the router to determine one or more source addresses for group G.
The mapping effectively translates IGMPv1 or IGMPv2 membership reports
to an IGMPv3 report, enabling the router to continue as if it had
initially received an IGMPv3 report. After the router is joined to
these groups, it sends out PIM join messages and continues to enable
joining from these groups, as long as it continues to receive IGMPv1
and IGMPv2 membership reports and no change occurs to the SSM mapping
for the group.
When you statically configure SSM mapping, the
router can discover source addresses from a statically configured
table.
The following conditions apply when you configure
SSM mapping:
- When SSM mapping is enabled, and either you have not configured
a static SSM map or the router cannot find any matching access lists,
the router continues to accept (*,G) groups. The PIM SSM range must
deny any unacceptable SSM group addresses.
- When you issue the no ip igmp ssm-map enable command, the router removes all SSM map (S,G) states and establishes
a (*,G) state.
- You can enter multiple ssm-map static commands for different access lists. Also, you can enter multiple ssm-map static commands for the same access list, as
long as the access list uses different source addresses.
- SSM maps do not process statically configured groups.
ip
igmp ssm-map enable
- Use to enable SSM mapping on the router. SSM mapping statically
assigns sources to IGMPv1 and IGMPv2 groups. You must use SSM mapping
for IGMPv1 and IGMPv2 hosts to interoperate with PIM SSM. SSM mapping
enables the router to use a statically configured list to translate
(*,G) memberships to (S,G) memberships.
- Example
- host1:boston(config)#ip igmp ssm-map enable
- Use the no version to disable
SSM mapping on the router.
- See ip igmp ssm-map enable.
ip
igmp ssm-map static
- Use to specify an access list and source address for use
in SSM mapping. SSM mapping statically assigns sources to IGMPv1 and
IGMPv2 groups. You must use SSM mapping for IGMPv1 and IGMPv2 hosts
to interoperate with PIM SSM. SSM mapping enables the router to use
a statically configured list to translate (*,G) memberships to (S,G)
memberships.
- Example
- host1:boston(config)#ip igmp ssm-map static
boston-list 51.0.0.1
- Use the no version to remove
the SSM map association.
- See ip igmp ssm-map static.
[Contents]
[Prev]
[Next]
[Index]
[Report an Error]
