Specifying Multicast Groups
You can use a standard-format or extended-format IP access list to specify the multicast
groups that a host can join.
ip igmp access-group
• Use to restrict hosts on this subnetwork to join only multicast groups that appear on
the specified IP access list.
• When this feature is configured, the access list is queried whenever the router receives
an IGMPv2 report requesting membership of a group, and IGMPv3 ChangeToInclude
or IsExclude reports. The request is rejected if the access list query fails.
• The ip igmp access-group command accepts standard or extended-format access
lists. Because the extended format enables you to specify both the source address
and the destination group address, the source address must be set to any. For example,
access-list test permit ip host 224.128.64.32 any.
• Note that in the access list specified when you issue this command, the group is
specified before the source.
• Example
host1:boston(config-if)#ip igmp access-group boston-list
• Use the no version to dissociate the interface from an access list and to enable hosts
on the interface to join any multicast group.
• See ip igmp access-group.
ip igmp access-source-group
• Use to restrict hosts on this subnetwork to membership in those (S,G) pairs (also
known as channels) included on the specified IP access list.
• When this feature is configured, both source and group addresses query the associated
access list whenever the router receives an IGMPv3 report requesting membership of
the (S,G) pairs (that is, the router receives an IGMPv3 ChangeToInclude, IsInclude, or
AllowNewSource group report). The request is rejected if the access list query fails.
• The ip igmp access-source-group command accepts standard or extended-format
access lists. The extended format enables you to specify both the source address and
the destination group address; for example, access-list test permit ip host 10.1.1.1
host 224.128.64.32. Typically, you use the extended-format access list. If you instead
use the standard-format access list, you explicitly specify the source address to create
the access list, but the group address is implicitly assumed to be any,
• Note that in the access list specified when you issue this command, the source is
specified before the group.
• Example
host1:boston(config-if)#ip igmp access-source-group dallas-list
Copyright © 2010, Juniper Networks, Inc.50
JunosE 11.2.x Multicast Routing Configuration Guide
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