Cisco Systems 3750E manual Configuring MLD Snooping Queries, 25-10

Chapter 25 Configuring IPv6 MLD Snooping

Configuring IPv6 MLD Snooping

Configuring MLD Snooping Queries

When Immediate Leave is not enabled and a port receives an MLD Done message, the switch generates MASQs on the port and sends them to the IPv6 multicast address for which the Done message was sent. You can optionally configure the number of MASQs that are sent and the length of time the switch waits for a response before deleting the port from the multicast group.

Beginning in privileged EXEC mode, follow these steps to configure MLD snooping query characteristics for the switch or for a VLAN:

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2
	ipv6 mld snooping robustness-variable	(Optional) Set the number of queries that are sent before switch will
	value	deletes a listener (port) that does not respond to a general query. The
		range is 1 to 3; the default is 2.
Step 3
	ipv6 mld snooping vlan vlan-id	(Optional) Set the robustness variable on a VLAN basis, which
	robustness-variable value	determines the number of general queries that MLD snooping sends
		before aging out a multicast address when there is no MLD report
		response. The range is 1 to 3; the default is 0. When set to 0, the number
		used is the global robustness variable value.
Step 4
	ipv6 mld snooping	(Optional) Set the number of MASQs that the switch sends before
	last-listener-query-count count	aging out an MLD client. The range is 1 to 7; the default is 2. The
		queries are sent 1 second apart.
Step 5
	ipv6 mld snooping vlan vlan-id	(Optional) Set the last-listener query count on a VLAN basis. This
	last-listener-query-count count	value overrides the value configured globally. The range is 1 to 7; the
		default is 0. When set to 0, the global count value is used. Queries are
		sent 1 second apart.
Step 6
	ipv6 mld snooping	(Optional) Set the maximum response time that the switch waits after
	last-listener-query-interval interval	sending out a MASQ before deleting a port from the multicast group.
		The range is 100 to 32,768 thousands of a second. The default is 1000
		(1 second).
Step 7
	ipv6 mld snooping vlan vlan-id	(Optional) Set the last-listener query interval on a VLAN basis. This
	last-listener-query-interval interval	value overrides the value configured globally. The range is 0 to 32,768
		thousands of a second. The default is 0. When set to 0, the global
		last-listener query interval is used.
Step 8
	ipv6 mld snooping tcn query solicit	(Optional) Enable topology change notification (TCN) solicitation,
		which means that VLANs flood all IPv6 multicast traffic for the
		configured number of queries before sending multicast data to only
		those ports requesting to receive it. The default is for TCN to be
		disabled.
Step 9
	ipv6 mld snooping tcn flood query count	(Optional) When TCN is enabled, specify the number of TCN queries
	count	to be sent. The range is from 1 to 10; the default is 2.
Step 10
	end	Return to privileged EXEC mode.
Step 11
	show ipv6 mld snooping querier [vlan	(Optional) Verify that the MLD snooping querier information for the
	vlan-id]	switch or for the VLAN.
Step 12
	copy running-config startup-config	(Optional) Save your entries in the configuration file.

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
25-10	OL-9775-02