Configure PIM-SMM
Configuring PIM-SSM is a two-step process.
1. Configure PIM-SMM.
2. Enable PIM-SSM for a range of addresses.
Related Configuration Tasks
•Use PIM-SSM with IGMP Version 2 Hosts
Enabling PIM-SSM
To enable PIM-SSM, follow these steps.
1. Create an ACL that uses permit rules to specify what range of addresses should use SSM.
CONFIGURATION mode
ip access-list standard name
2. Enter the ip pim ssm-range command and specify the ACL you created.
CONFIGURATION mode
ip pim ssm-range acl-name
Enabling PIM-SSM
To display address ranges in the PIM-SSM range, use the show ip pim ssm-range command from
EXEC Privilege mode.
R1(conf)#do show run pim
!
ip pim rp-address 10.11.12.2 group-address 224.0.0.0/4
ip pim ssm-range ssm
R1(conf)#do show run acl
!
ip access-list standard ssm
seq 5 permit host 239.0.0.2
R1(conf)#do show ip pim ssm-range
Group Address / MaskLen
239.0.0.2 / 32
Use PIM-SSM with IGMP Version 2 Hosts
PIM-SSM requires receivers that support IGMP version 3. You can employ PIM-SSM even when receivers
support only IGMP version 1 or version 2 by translating (*,G) entries to (S,G) entries.
Translate (*,G) entries to (S,G) entries using the ip igmp ssm-map acl command source from
CONFIGURATION mode. In a standard access list, specify the groups or the group ranges that you want
to map to a source. Then, specify the multicast source.
• When an SSM map is in place and the system cannot find any matching access lists for a group, it
continues to create (*,G) entries because there is an implicit deny for unspecified groups in the ACL.
• When you remove the mapping configuration, the system removes the corresponding (S,G) states that
it created and re-establishes the original (*,G) states.
672 PIM Source-Specific Mode (PIM-SSM)