Mld Snooping Configuration Guidelines - Cisco Catalyst 4500 Series Configuration Manual

Configuring IPv6 MLD Snooping

MLD Snooping Configuration Guidelines

When configuring MLD snooping, consider these guidelines:
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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:
Command
Step 1
Switch# configure terminal
Step 2
Switch(config)# ipv6 mld snooping
Step 3
Switch(config)# end
Step 4
Switch# copy running-config
startup-config
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
Step 1
Switch# configure terminal
Step 2
Switch(config)# ipv6 mld snooping
Step 3
Switch(config)# ipv6 mld snooping vlan
vlan-id
Step 4
Switch(config)# end
Step 5
Switch# copy running-config
startup-config
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
26-6
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 with 512 MB of memory supports about 11000 MLD Snooping multicast
groups. A supervisor engine with 1 GB memory supports 16384 MLD Snooping multicast groups.
Purpose
Enters global configuration mode.
Globally enables MLD snooping on the switch.
Returns to privileged EXEC mode.
(Optional) Saves your entries in the configuration file.
Purpose
Enters global configuration mode.
Globally enables MLD snooping on the switch.
Enables MLD snooping on the VLAN. The VLAN ID range is 1 to
1001 and 1006 to 4094.
MLD snooping must be globally enabled for VLAN snooping
Note
to be enabled.
Returns to privileged EXEC mode.
(Optional) Saves your entries in the configuration file.
Chapter 26 Configuring IPv6 MLD Snooping
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