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24-6
Software Configuration Guide—Release 15.0(2)SG
OL-23818-01
Chapter 24 Configuring IPv6 MLD Snooping
Configuring IPv6 MLD Snooping
MLD Snooping Configuration Guidelines
When configuring MLD snooping, consider these guidelines:
• You can configure MLD snooping characteristics at any time, but you must globally enable MLD
snooping by using the ipv6 mld snooping global configuration command for the configuration to
take effect.
• MLD snooping and IGMP snooping act independently of each other. You can enable both features
at the same time on the switch. The total number of IPv4 and IPv6 multicast groups entries that can
coexist on the Catalyst 4500 series switch is limited to 16384.
• The Supervisor Engine 6-E with 512 MB of memory supports about 11000 MLD Snooping multicast
groups. A Supervisor Engine 6-E with 1 GB memory supports 16384 MLD Snooping multicast
groups.
Enabling or Disabling MLD Snooping
By default, IPv6 MLD snooping is globally disabled on the switch and enabled on all VLANs. When
MLD snooping is globally disabled, it is also disabled on all VLANs. When you globally enable MLD
snooping, the VLAN configuration overrides the global configuration. MLD snooping is enabled only
on VLAN interfaces in the default state (enabled).
You can enable and disable MLD snooping on a per-VLAN basis, but if you globally disable MLD
snooping, it is disabled in all VLANs. If global snooping is enabled, you can enable or disable VLAN
snooping.
To globally enable MLD snooping on the switch, perform this task:
To globally disable MLD snooping on the switch, use the no ipv6 mld snooping global configuration
command.
To enable MLD snooping on a VLAN, perform this task:
Command Purpose
Step 1
Switch# configure terminal
Enters global configuration mode.
Step 2
Switch(config)# ipv6 mld snooping
Globally enables MLD snooping on the switch.
Step 3
Switch(config)# end
Returns to privileged EXEC mode.
Step 4
Switch# copy running-config
startup-config
(Optional) Saves your entries in the configuration file.
Command Purpose
Step 1
Switch# configure terminal
Enters global configuration mode.
Step 2
Switch(config)# ipv6 mld snooping
Globally enables MLD snooping on the switch.
Step 3
Switch(config)# ipv6 mld snooping vlan
vlan-id
Enables MLD snooping on the VLAN. The VLAN ID range is 1 to
1001 and 1006 to 4094.
Note MLD snooping must be globally enabled for VLAN snooping
to be enabled.