ip igmp snooping drop-unknown

Description

Configures drop-unknown mode. While IGMP snooping is enabled, the traffic will be forwarded only to ports that made an IGMP request for the multicast. Drop unknown filters ensure that packets are not forwarded to ports that did not make a request for the traffic stream. This could either be a filter across all VLANs (vlan-shared) or per VLAN (vlan-exclusive). The default is vlan-shared.

The no form of this command disables drop unknown on the switch.

Command context

config

Parameters

vlan-shared

Enables shared VLAN filter on the switch. Default: vlan-shared.

vlan-exclusive

Enables exclusive drop unknown filter per VLAN.

Authority

Administrators

Examples

Configuring shared VLAN filter on the switch:

switch# configure terminal
switch(config)# ip igmp snooping drop-unknown vlan-shared

Configuring exclusive drop unknown filter per VLAN:

switch# configure terminal
switch(config)# ip igmp snooping drop-unknown vlan-exclusive

Disabling drop unknown on the switch:

switch# configure terminal
switch(config)# no ip igmp snooping drop-unknown