Igmp And Mld Versions - Cisco XR12000 Series Configuration Manual

Implementing Multicast Routing on Cisco IOS XR Software

IGMP and MLD Versions

The following points describe IGMP versions 1, 2, and 3:
• IGMP Version 1 provides for the basic query-response mechanism that allows the multicast router to
determine which multicast groups are active and for other processes that enable hosts to join and leave
a multicast group.
• IGMP Version 2 extends IGMP allowing such features as the IGMP query timeout and the maximum
query-response time. See RFC 2236.
MLDv1 provides the same functionality (under IPv6) as IGMP Version 2.
Note
• IGMP Version 3 permits joins and leaves for certain source and group pairs instead of requesting traffic
from all sources in the multicast group.
MLDv2 provides the same functionality (under IPv6) as IGMP Version 3.
Note
IGMP Routing Example
Figure 2: IGMPv3 Signaling, on page 10
to group 239.1.1.1. The 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
OL-30405-02
Internet Group Management Protocol and Multicast Listener Discovery
illustrates two sources, 10.0.0.1 and 10.0.1.1, that are multicasting
Cisco IOS XR Multicast Configuration Guide for the Cisco XR12000 Series Router, Release 5.1.x
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