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Displaying IGMP Snooping Configuration Information
Summit 200 Series Switch Installation and User Guide 235
Displaying IGMP Snooping Configuration Information
To display IGMP snooping registration information and a summary of all IGMP timers and states, use
the following command:
show igmp snooping {vlan <name>} {detail}
When you enter this command on a stack of switches, it shows all entries on all switches in the stack.
Clearing, Disabling, and Resetting IGMP Functions
To clear IGMP snooping entries, disable IGMP or IGMP snooping, or return IGMP settings to their
defaults, use the commands listed in Table 71.
enable igmp {vlan <name>} Enables IGMP on a router interface. If no VLAN
is specified, IGMP is enabled on all router
interfaces. The default setting is enabled.
enable igmp snooping
{forward-mcrouter-only} {with-proxy}
Enables IGMP snooping on the switch.
Specify the forward-mcrouter-only option to
have the switch forward all multicast traffic to the
multicast router only; otherwise, the switch
forwards all multicast traffic to any IP router.
Specify the with-proxy option to enable the
IGMP snooping proxy. This command is useful
for troubleshooting purposes. Enabling the proxy
allows the switch to suppress duplicate “join”
requests on a group to prevent forwarding to the
connected layer 3 switch. The proxy also
suppresses superfluous IGMP “leave” messages
so that they are forwarded only when the last
member leaves the group.
If snooping is not enabled, enabling the proxy
also enables snooping. The default setting is
enabled.
Table 71: IGMP Disable and Reset Commands
Command Description
clear igmp snooping {vlan <name>} Removes one or all IGMP snooping entries.
disable igmp {vlan <name>} Disables the router-side IGMP processing on a
router interface. No IGMP query is generated, but
the switch continues to respond to IGMP queries
received from other devices. If no VLAN is
specified, IGMP is disabled on all router
interfaces.
disable igmp snooping Disables IGMP snooping. Disabling IGMP
snooping allows all IGMP and IP multicast traffic
to flood within a given VLAN.
Table 70: IGMP and IGMP Snooping Commands (continued)
Command Description