Administrator Guide
!
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
Member Ports: Te 1/1
239.0.0.1 Vlan 400 INCLUDE 00:00:10 Never 10.11.4.2
R1(conf)#do show ip igmp ssm-map
IGMP Connected Group Membership
Group Address Interface Mode Uptime Expires Last Reporter
239.0.0.2 Vlan 300 IGMPv2-Compat 00:00:36 Never 10.11.3.2
Member Ports: Te 1/1
R1(conf)#do show ip igmp ssm-map 239.0.0.2
SSM Map Information
Group : 239.0.0.2
Source(s) : 10.11.5.2
R1(conf)#do show ip igmp groups detail
Interface Vlan 300
Group 239.0.0.2
Uptime 00:00:01
Expires Never
Router mode IGMPv2-Compat
Last reporter 10.11.3.2
Last reporter mode IGMPv2
Last report received Join
Group source list
Source address Uptime Expires
10.11.5.2 00:00:01 Never
Interface Vlan 400
Group 239.0.0.1
Uptime 00:00:05
Expires Never
Router mode INCLUDE
Last reporter 10.11.4.2
Last reporter mode INCLUDE
Last report received ALLOW
Group source list
Source address Uptime Expires
10.11.5.2 00:00:05 00:02:04
Member Ports: Te 1/2
Electing an RP using the BSR Mechanism
Every PIM router within a domain must map a particular multicast group address to the same RP. The group-to-RP mapping may be
statically or dynamically congured. RFC 5059 species a dynamic, self-conguring method called the Bootstrap Router (BSR) mechanism,
by which an RP is elected from a pool of RP candidates (C-RPs).
Some routers within the domain are congured to be C-RPs. Other routers are congured to be Bootstrap Router candidates (C-BSRs);
one router is elected the BSR for the domain and the BSR is responsible for forwarding BSM containing RP-set information to other
routers.
The RP election process is as follows:
1 C-BSRs ood their candidacy throughout the domain in a BSM. Each message contains a BSR priority value, and the C-BSR with the
highest priority value becomes the BSR.
2 Each C-RP unicasts periodic Candidate-RP-Advertisements to the BSR. Each message contains an RP priority value and the group
ranges for which it is a C-RP.
3 The BSR determines the most ecient and stable group-to-RP mappings, which is called the RP-Set.
PIM
Source-Specic Mode (PIM-SSM) 691