Configuring Mld Snooping Queries - Cisco WS-C2960-24LC-S Software Configuration Manual

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
Step 1
configure terminal
Step 2 ipv6 mld snooping robustness-variable
value
Step 3 ipv6 mld snooping vlan vlan-id
robustness-variable value
Step 4
ipv6 mld snooping
last-listener-query-count count
Step 5
ipv6 mld snooping vlan vlan-id
last-listener-query-count count
Step 6
ipv6 mld snooping
last-listener-query-interval interval
Step 7 ipv6 mld snooping vlan vlan-id
last-listener-query-interval interval
Step 8 ipv6 mld snooping tcn query solicit
Step 9 ipv6 mld snooping tcn flood query count
count
Step 10 end
Step 11 show ipv6 mld snooping querier [vlan
vlan-id]
Step 12
copy running-config startup-config
Catalyst 2960 Switch Software Configuration Guide
30-10
Purpose
Enter global configuration mode.
(Optional) Set the number of queries that are sent before switch will
deletes a listener (port) that does not respond to a general query. The
range is 1 to 3; the default is 2.
(Optional) Set 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) Set 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) Set 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) Set 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) Set 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) 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.
(Optional) When TCN is enabled, specify the number of TCN queries
to be sent. The range is from 1 to 10; the default is 2.
Return to privileged EXEC mode.
(Optional) Verify that the MLD snooping querier information for the
switch or for the VLAN.
(Optional) Save your entries in the configuration file.
Chapter 30 Configuring IPv6 MLD Snooping
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