- Foundry Router User Guide

Multicasting
June 2004 © 2004 Foundry Networks, Inc. 14 - 5
membership information enables the router to forward traffic only from those sources from which receivers
requested the traffic.
IGMPv3 supports applications that explicitly signal sources from which they want to receive traffic. With IGMPv3,
receivers signal membership to a multicast host group in the following two modes:
• INCLUDE mode: In this mode, the receiver announces membership to a host group and provides a list of IP
addresses (the INCLUDE list) from which it wants to receive traffic.
• EXCLUDE mode: In this mode, the receiver announces membership to a host group and provides a list of IP
addresses (the EXCLUDE list) from which it does not want to receive traffic. This indicates that the host wants
to receive traffic only from other sources whose IP addresses are not listed in the EXCLUDE list. To receive
traffic from all sources, like in the case of the Internet Standard Multicast (ISM) service model, a host
expresses EXCLUDE mode membership with an empty EXCLUDE list.
IGMPv3 is used by the hosts to express their desire to be a part of the source-specific multicast (SSM) which is an
emerging standard used by routers to direct multicast traffic to the host only if its is from a specific source.
IGMP Commands
The IGMP commands supported are:
T
ABLE 6 IGMP COMMANDS
Enabling igmp Foundry/configure > ip igmp
Disabling igmp Foundry/configure > no ip igmp
Enabling igmp Foundry/configure/ip/igmp# interface <interface-name#[:
dlci-no]
Disabling igmp Foundry/configure/ip/igmp# no interface <interface-name#
Configuring version Foundry/configure/ip/igmp/interface ethernet0# version
<version#
Configuring Query
Interval
Foundry/configure/ip/igmp/interface ethernet0# query-
interval <interval#
Configuring Maximum
Response Time
Foundry/configure/ip/igmp/interface ethernet0# query-
response-interval <interval#
Configuring Last
Member Query Interval
Foundry/configure/ip/igmp/interface ethernet0# last-
member-query-interval <interval#
Configuring Last
Member Query Count
Foundry/configure/ip/igmp/interface ethernet0# last-
member-query-count <value#
Configuring Startup
Query Interval
Foundry/configure/ip/igmp/interface ethernet0# startup-
query-interval <interval#
Configuring Startup
Query Count
Foundry/configure/ip/igmp/interface ethernet0# startup-
query-count <count#
Configuring Robustness Foundry/configure/ip/igmp/interface ethernet0# robustness
<value#
Configuring Ignore-v1-
message
Foundry/configure/ip/igmp/interface ethernet0# [no] ignore-
v1-messages
Configuring Ignore-v2-
message
Foundry/configure/ip/igmp/interface ethernet0# [no] ignore-
v2-messages