Usage guidelines
This feature enables an IGMP querier to send leave notifications to the upstream routers without sending
group-specific or group-and-source-specific queries after receiving leave messages.
In an IPv4 basic ACL, the source keyword matches the multicast group address in IGMP leave messages.
If you specify the vpn-instance keyword in an ACL rule, the rule does not take effect. The other optional
parameters except the time-range keyword and the fragment keyword in the ACL rules are ignored.
Examples
# Enable fast-leave processing on VLAN-interface 100.
<Sysname> system-view
[Sysname] interface vlan-interface 100
[Sysname-Vlan-interface100] igmp fast-leave
igmp group-policy
Use igmp group-policy to configure a multicast group policy on an interface to control the multicast
groups that receiver hosts attached to the interface can join.
Use undo igmp group-policy to remove the configured multicast group policy.
Syntax
igmp group-policy acl-number [ version-number ]
undo igmp group-policy
Default
Multicast group policies are not configured on an interface, and receiver hosts attached to the interface
can join multicast groups.
Views
Interface view
Predefined user roles
network-admin
Parameters
acl-number: Specifies an IPv4 basic or advanced ACL by its number in the range of 2000 to 3999.
Receiver hosts can join only the multicast groups that the ACL permits. If the specified ACL does not exist
or the specified ACL does not contain valid rules, receiver hosts cannot join multicast groups.
version-number: Specifies an IGMP version in the range of 1 to 3. By default, the configured group filter
applies to IGMP reports of all versions.
Usage guidelines
In an IPv4 basic ACL, the source keyword matches the multicast group address in IGMP reports. In an
IPv4 advanced ACL, the source and destination keywords match the multicast source address and
multicast group address in IGMP reports, respectively. The multicast source address is considered to be
0.0.0.0 for the following IGMP reports:
• IGMPv1 and IGMPv2 reports.
• IGMPv3 IS_EX and IGMPv3 TO_EX reports that do not carry multicast source addresses.
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