Users Guide

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.
• You may enter multiple ssm-map commands for different access lists. You may also enter multiple ssm-
map commands for the same access list, as long as they use different source addresses.
• When an extended ACL is associated with this command, an error message is displayed. If you apply an
extended ACL before you create it, the system accepts the configuration, but when the ACL is later
defined, the system ignores the ACL and the stated mapping has no effect.
To display the source to which a group is mapped, use the show ip igmp ssm-map [group] command. If
you use the
group option, the command displays the group-to-source mapping even if the group is not
currently in the IGMP group table. If you do not specify the group option, the display is a list of groups
currently in the IGMP group table that has a group-to-source mapping.
To display the list of sources mapped to a group currently in the IGMP group table, use the show ip igmp
groups group detail
command.
Configuring PIM-SSM with IGMPv2
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 map
seq 5 permit host 239.0.0.2
!
ip access-list standard ssm
seq 5 permit host 239.0.0.2
R1(conf)#ip igmp ssm-map map 10.11.5.2
R1(conf)#do show ip igmp groups
Total Number of Groups: 2
IGMP Connected Group Membership
Group Address Interface Mode Uptime Expires Last Reporter
239.0.0.2 Vlan 300 IGMPv2-Compat 00:00:07 Never 10.11.3.2
PIM Source-Specific Mode (PIM-SSM) 802