Mld Snooping Configuration Guidelines; Enabling Or Disabling Mld Snooping - Cisco WS-C3020 Software Configuration Manual

Configuring IPv6 MLD Snooping
Table 36-1
Feature
Last listener query interval
TCN query solicit
TCN query count
MLD listener suppression

MLD Snooping Configuration Guidelines

When configuring MLD snooping, consider these guidelines:
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Note
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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. That is, 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 or for a range of VLANs, 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.
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
36-6
Default MLD Snooping Configuration (continued)
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.
When the IPv6 multicast router is a Catalyst 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 switch
in order for the 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 multicast router.
MLD snooping and IGMP snooping act independently of each other. You can enable both features
at the same time on the switch.
To use IPv6, you must first configure a dual IPv4 and IPv6 SDM template on the switch. You select
the template by entering the sdm prefer dual-ipv4-and-ipv6 {default | routing | vlan} global
configuration command.
When you select and configure SDM templates, you must reload the switch for the configuration
to take effect.
The maximum number of address entries allowed for the switch is 1000.
The maximum number of multicast entries allowed on the switch is determined by the configured
SDM template.
Default Setting
Global: 1000 (1 second); VLAN: 0.
The VLAN value overrides the global setting. When the
Note
VLAN value is 0, the VLAN uses the global interval.
Disabled.
2.
Enabled.
Chapter 36 Configuring IPv6 MLD Snooping
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