Configuring Mld Snooping Queries - Cisco Catalyst 4500 Series Software Configuration Manual

Chapter 29 Configuring IPv6 Multicast Listener Discovery 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.
To configure MLD snooping query characteristics for the switch or for a VLAN, perform this task:
Command
Step 1
Switch# configure terminal
Step 2
Switch(config)# ipv6 mld snooping
robustness-variable value
Step 3
Switch(config)# ipv6 mld snooping
vlan vlan-id robustness-variable
value
Step 4
Switch(config)# ipv6 mld snooping
last-listener-query-count count
Step 5
Switch(config)# ipv6 mld snooping
vlan vlan-id
last-listener-query-count count
Step 6
Switch(config)# ipv6 mld snooping
last-listener-query-interval interval
Step 7
Switch(config)# ipv6 mld snooping
vlan vlan-id
last-listener-query-interval interval
Step 8
Switch(config)# ipv6 mld snooping tcn
query solicit
Step 9
Switch(config)# ipv6 mld snooping tcn
flood query count count
Step 10
Switch(config)# end
Step 11
Switch# show ipv6 mld snooping
querier [vlan vlan-id]
Step 12
Switch# copy running-config
startup-config
This example shows how to set the MLD snooping global robustness variable to 3:
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Purpose
Enters global configuration mode.
(Optional) Sets the number of queries that are sent before the switch
deletes a listener (port) that does not respond to a general query. The
range is 1 to 3; the default is 2.
(Optional) Sets the robustness variable on a VLAN basis, which
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.
(Optional) Sets the number of MASQs that the switch sends before
aging out an MLD client. The range is 1 to 7; the default is 2. The
queries are sent 1 second apart.
(Optional) Sets the last-listener query count on a VLAN basis. This
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.
(Optional) Sets the maximum response time that the switch waits after
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).
(Optional) Sets the last-listener query interval on a VLAN basis. This
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.
(Optional) Enables 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.
(Optional) When TCN is enabled, specifies the number of TCN queries
to be sent. The range is from 1 to 10; the default is 2.
Returns to privileged EXEC mode.
(Optional) Verifies that the MLD snooping querier information for the
switch or for the VLAN.
(Optional) Saves your entries in the configuration file.
Configuring IPv6 MLD Snooping
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