Reference Guide

Internet Group Management Protocol (IGMP) | 595
Usage
Information
Queriers normally send a certain number of queries when a leave message is received
prior to deleting a group from the membership database. There may be situations in
which fast deletion of a group is required. When IGMP fast leave processing is
enabled, the switch will remove an interface from the multicast group as soon as it
detects an IGMP version 2 leave message on the interface.
ip igmp snooping flood
c e s
This command controls the flooding behavior of unregistered multicast data packets.
On the E-Series, when flooding is enabled (the default), unregistered multicast data
traffic is flooded to all ports in a VLAN. When flooding is disabled, unregistered
multicast data traffic is forwarded to only multicast router ports, both static and
dynamic, in a VLAN. If there is no multicast router port in a VLAN, then
unregistered multicast data traffic is dropped. On the
C-Series and S-Series, unregistered multicast data traffic is dropped when flooding is
disabled; they do not forward the packets to multicast router ports. On the C-Series
and S-Series, Layer 3 multicast must be disabled (
no ip multicast-routing) in order to
disable Layer 2 multicast flooding.
Syntax ip igmp snooping flood
Defaults
Enabled
Command Modes
CONFIGURATION
Command
History
ip igmp snooping last-member-query-interval
c e s
The last member query interval is the “maximum response time” inserted into
Group-Specific queries sent in response to Group-Leave messages. This interval is
also the interval between successive Group-Specific Query messages. Use this
command to change the last member query interval.
Syntax
ip igmp snooping last-member-query-interval milliseconds
To return to the default value, enter
no ip igmp snooping last-member-query-interval.
Parameters
Version 8.3.19.0 Introduced on S4820T
Version 8.3.7.0 Introduced on S4810
Version 8.2.1.0 Introduced on the C-Series and S-Series.
Version 7.7.1.1 Introduced on E-Series.
milliseconds Enter the interval in milliseconds.
Default: 1000 milliseconds
Range: 100 to 65535