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Enable MLD Snooping
MLD is automatically enabled when you enable IPv6 PIM, but MLD Snooping must be explicitly enabled.
Disable MLD Snooping on a VLAN
When MLD is enabled globally, it is by default enabled on all VLANs. Disable snooping on a VLAN,
using the command
no ipv6 mld snooping from INTERFACE VLAN mode. Note that under the default
configuration there is no need to configure
ipv6 mld snooping for any VLAN.
Configure the Switch as a Querier
Hosts that do not support unsolicited reporting wait for a general query before sending a membership
report. When the multicast source and receivers are in the same VLAN, multicast traffic is not routed, and
so there is no querier. You must configure the switch to be the querier for a VLAN so that hosts send
membership reports, and the switch can generate a forwarding table by snooping.
Configure the switch to be the querier for a Layer 2 VLAN using the command
ipv6 mld snooping querier
from INTERFACE VLAN mode. You must configure an IP address for the VLAN.
The source address of the queries is 0 to distinguish these queries from router queries. If the system
receives a query with a non-zero address any VLAN interface, it stops sending queries. When a VLAN
configured with snooping querier comes up, the VLAN interface waits for querier timeout to expire before
becoming querier.
Disable Multicast Flooding
If the switch receives a multicast packet that has an IP address of a group it has not learned (unregistered
frame), the switch floods that packet out of all ports on the VLAN.
You can configure the switch to only forward unregistered packets to ports on a VLAN that are connected
to a multicast routers using the command
no ipv6 mld snooping flood from CONFIGURATION mode.
When flooding is disabled, if there are no such ports in the VLAN connected to a multicast router, the
switch drops the packets.
Specify a Port as Connected to a Multicast Router
All MLD control packets and IP multicast data traffic originating from hosts are forwarded out all
interfaces connected to multicast routers. These interfaces are called multicast router interfaces, or mrouter
interfaces. You can statically specify a port in a VLAN as connected to a multicast router using the
command
ipv6 mld snooping mrouter interface from INTERFACE VLAN mode.
Task Command Syntax Command Mode
Enable MLD Snooping
ipv6 mld snooping enable
CONFIGURATION