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switches.
Corresponding to the two leaving methods for hosts, there are also two methods for switches to
remove ports from multicast entries: aging or getting LEAVE packets.
Leave through aging: When a switch doesn't get REPORT packets for a group from a port for
some period of time, the port will be deleted from the corresponding multicast entry; if no port is
left in the entry, the entry will also be removed.
Leave through LEAVE packets: When a switch has enabled the option "immediate leave", if a
port gets a LEAVE packet for a group, the port will be deleted from the corresponding multicast
entry; if no port is left in the entry, the entry will also be removed. The "immediate leave"
functionality is usually used when one port has only one connected host.
7.2 IGMP SNOOPING configuration
This section describes how to configure IGMP SNOOPING. Section index:
Default configuration for IGMP SNOOPING;
To enable and disable IGMP SNOOPING;
To enable and disable "immediate leave";
To configure the aging time for multicast;
To show multicast information.
1. Default configuration for IGMP SNOOPING
By default IGMP SNOOPING is disabled, and Layer 2 hardware multicast transmission table is
in unregistered mode (as mentioned before).
The option "immediate leave" is also disabled by default.
The multicast aging time is 300 seconds by default.
2. To enable and disable IGMP SNOOPING
To enable IGMP SNOOPING under overall mode, which will add an entry to FFP
(Fast Filter Process) of all ports:
igmp snooping
To disable IGMP SNOOPING under overall mode:
no igmp snooping
3. To enable and disable "immediate leave"
To enable "immediate leave" under overall mode:
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