User Manual
UMN:CLI
V8102
495
Command
Mode
Description
no ip igmp snooping immediate-
leave
Global
Disables the IGMP snooping immediate leave.
no ip igmp snooping port
PORTS
immediate-leave
no ip igmp snooping vlan
VLANS
immediate-leave
Use this command with the explicit host tracking feature. If you don
’t, when there is more
than one IGMP host belonging to a VLAN, and a certain host sends a leave group mes-
sage, the switch will remove all host entries on the forwarding table from the VLAN. The
switch will lose contact with the hosts that should remain in the forwarding table until they
send join requests in response to the switch's next general query message.
10.2.3.4
IGMP Snooping Report Suppression
If an IGMP querier sends general query messages, and hosts are still interested in the
multicast traffic, the hosts should return membership report messages. For a multicast
router, however, it is sufficient to know that there is at least one interested member for a
group on the network segment. Responding a membership report per each of group
members may unnecessarily increase the traffic on the network; only one report per
group is enough.
When the IGMP snooping report suppression is enabled, a switch suppresses member-
ship reports from hosts other than the first one, allowing the switch to forward only one
membership report in response to a general query from a multicast router.
To enable the IGMP snooping report suppression, use the following command.
Command
Mode
Description
ip
igmp
snooping
report-
suppression
Global
Enables the IGMP snooping report suppression global-
ly.
ip igmp snooping vlan
VLANS
report-suppression
Enables the IGMP snooping report suppression on a
VLAN.
VLANS: VLAN ID (1-4094)
To disable the IGMP snooping report suppression, use the following command.
Command
Mode
Description
no ip igmp snooping report-
suppression
Global
Disables the IGMP snooping report suppression.
no ip igmp snooping vlan
VLANS
report-suppression
The IGMP snooping report suppression is supported only IGMPv1 and IGMPv2 reports.
In case of an IGMPv3 report, a single membership report can contain the information for
all the groups which a host is interested in. Thus, there is no need for the report suppres-
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