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Catalyst 3560 Switch Command Reference
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Chapter 2 Catalyst 3560 Switch Cisco IOS Commands
ipv6 mld snooping
ipv6 mld snooping
Use the ipv6 mld snooping global configuration command without keywords to enable IP version 6
(IPv6) Multicast Listener Discovery (MLD) snooping globally or on the specified VLAN. Use the no
form of this command to disable MLD snooping on the switch or the VLAN.
ipv6 mld snooping [vlan vlan-id]
no ipv6 mld snooping [vlan vlan-id]
Note This command is available only if the switch is running the advanced IP services image and you have
configured a dual IPv4 and IPv6 Switch Database Management (SDM) template on the switch.
Syntax Description
Defaults MLD snooping is globally disabled on the switch.
MLD snooping is enabled on all VLANs. However, MLD snooping must be globally enabled before
VLAN snooping will take place.
Command Modes Global configuration
Command History
Usage Guidelines To configure the dual IPv4 and IPv6 template, enter the sdm prefer dual-ipv4-and-ipv6 {default | vlan)
global configuration command and reload the switch.
When MLD snooping is globally disabled, it is disabled on all the existing VLAN interfaces. When you
globally enable MLD snooping, it is enabled on all VLAN interfaces that are in the default state
(enabled). VLAN configuration will override global configuration on interfaces on which MLD
snooping has been disabled.
If MLD snooping is globally disabled, you cannot enable it on a VLAN. If MLD snooping is globally
enabled, you can disable it on individual VLANs.
When the IPv6 multicast router is a Catalyst 6500 switch and you are using extended VLANs (in the
range 1006 to 4094), IPv6 MLD snooping must be enabled on the extended VLAN on the Catalyst 6500
switch in order for the Catalyst 3750 or Catalyst 3560 switch to receive queries on the VLAN. For
normal-range VLANs (1 to 1005), it is not necessary to enable IPv6 MLD snooping on the VLAN on the
Catalyst 6500 switch.
VLAN numbers 1002 through 1005 are reserved for Token Ring and FDDI VLANs and cannot be used
in MLD snooping.
vlan vlan-id (Optional) Enable or disable IPv6 MLD snooping on the specified VLAN.
The VLAN ID range is 1 to 1001 and 1006 to 4094.
Release Modification
12.2(25)SED This command was introduced.
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