Cisco XR 12000 Series Configuration Manual page 14

Information About Implementing Multicast Routing
MLDv1 provides the same functionality (under IPv6) as IGMP Version 2.
Note
•
MLDv2 provides the same functionality (under IPv6) as IGMP Version 3.
Note
IGMP Routing Example
Figure 2
receiver wants to receive traffic addressed to group 239.1.1.1 from source 10.0.0.1 but not from source
10.0.1.1. The host must send an IGMPv3 message containing a list of sources and groups (S, G) that it
wants to join and a list of sources and groups (S, G) that it wants to leave. Router C can now use this
information to prune traffic from Source 10.0.1.1 so that only Source 10.0.0.1 traffic is being delivered to
Router C.
Figure 2
Router A
When configuring IGMP, ensure that all systems on the subnet support the same IGMP version. The
Note
router does not automatically detect Version 1 systems. Configure the router for Version 2 if your hosts
do not support Version 3.
Multicast Configuration Guide
MCC-6
IGMP Version 3 permits joins and leaves for certain source and group pairs instead of requesting
traffic from all sources in the multicast group.
illustrates two sources, 10.0.0.1 and 10.0.1.1, that are multicasting to group 239.1.1.1. The
IGMPv3 Signaling
Source = 10.0.0.1
Group = 239.1.1.1
Router C
Host receiver
Member of
239.1.1.1
Implementing Multicast Routing on Cisco IOS XR Software Cisco ASR 9000 Series Routers
Source = 10.0.1.1
Group = 239.1.1.1
Router B
IGMPv3 message:
Join 10.0.0.1, 239.1.1.1
OL-