Topology Change Notification Processing; Configuring Ipv6 Mld Snooping; Default Mld Snooping Configuration - Cisco Catalyst 2360 Software Configuration Manual

Chapter 16

Configuring IPv6 MLD Snooping

The number of MASQs generated is configured by using the ipv6 mld snooping last-listener-query
count global configuration command. The default number is 2.
The MASQ is sent to the IPv6 multicast address for which the Done message was sent. If there are no
reports sent to the IPv6 multicast address specified in the MASQ during the switch maximum response
time, the port on which the MASQ was sent is deleted from the IPv6 multicast address database. The
maximum response time is the time configured by using the ipv6 mld snooping
last-listener-query-interval global configuration command. If the deleted port is the last member of the
multicast address, the multicast address is also deleted, and the switch sends the address leave
information to all detected multicast routers.

Topology Change Notification Processing

When topology change notification (TCN) solicitation is enabled by using the ipv6 mld snooping tcn
query solicit global configuration command, MLDv1 snooping sets the VLAN to flood all IPv6
multicast traffic with a configured number of MLDv1 queries before it begins sending multicast data
only to selected ports. You set this value by using the ipv6 mld snooping tcn flood query count global
configuration command. The default is to send two queries. The switch also generates MLDv1 global
Done messages with valid link-local IPv6 source addresses when the switch becomes the STP root in the
VLAN or when it is configured by the user. This is same as done in IGMP snooping.
Configuring IPv6 MLD Snooping
These sections describe how to configure IPv6 MLD snooping:
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Default MLD Snooping Configuration

Table 16-1
Table 16-1
Feature
MLD snooping (Global)
MLD snooping (per VLAN)
IPv6 Multicast addresses
OL-19808-01
Default MLD Snooping Configuration, page 16-5
MLD Snooping Configuration Guidelines, page 16-6
Enabling or Disabling MLD Snooping, page 16-6
Configuring a Static Multicast Group, page 16-8
Configuring a Multicast Router Port, page 16-8
Enabling MLD Immediate Leave, page 16-9
Configuring MLD Snooping Queries, page 16-10
Disabling MLD Listener Message Suppression, page 16-11
shows the default MLD snooping configuration.
Default MLD Snooping Configuration
Default Setting
Disabled.
Enabled. MLD snooping must be globally enabled for VLAN
MLD snooping to take place.
None configured.
Catalyst 2360 Switch Software Configuration Guide
Configuring IPv6 MLD Snooping
16-5