Topology Change Notification Processing; Configuring Ipv6 Mld Snooping; Default Mld Snooping Configuration - Cisco WS-C2960-24LC-S Software Configuration Manual

Chapter 30

Configuring IPv6 MLD Snooping

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 30-1
Table 30-1
Feature
MLD snooping (Global)
MLD snooping (per VLAN)
IPv6 Multicast addresses
IPv6 Multicast router ports
MLD snooping Immediate Leave
MLD snooping robustness variable
Last listener query count
OL-8603-04
Default MLD Snooping Configuration, page 30-5
MLD Snooping Configuration Guidelines, page 30-6
Enabling or Disabling MLD Snooping, page 30-6
Configuring a Static Multicast Group, page 30-8
Configuring a Multicast Router Port, page 30-8
Enabling MLD Immediate Leave, page 30-9
Configuring MLD Snooping Queries, page 30-10
Disabling MLD Listener Message Suppression, page 30-11
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.
None configured.
Disabled.
Global: 2; Per VLAN: 0.
Note The VLAN value overrides the global setting. When the
VLAN value is 0, the VLAN uses the global count.
Global: 2; Per VLAN: 0.
The VLAN value overrides the global setting. When the
Note
VLAN value is 0, the VLAN uses the global count.
Catalyst 2960 Switch Software Configuration Guide
Configuring IPv6 MLD Snooping
30-5