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Chapter 36
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 36-1
Table 36-1
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-8915-03
Default MLD Snooping Configuration, page 36-5
MLD Snooping Configuration Guidelines, page 36-6
Enabling or Disabling MLD Snooping, page 36-6
Configuring a Static Multicast Group, page 36-8
Configuring a Multicast Router Port, page 36-8
Enabling MLD Immediate Leave, page 36-9
Configuring MLD Snooping Queries, page 36-10
Disabling MLD Listener Message Suppression, page 36-11
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.
The VLAN value overrides the global setting. When the
Note
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.
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
Configuring IPv6 MLD Snooping
36-5
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