Users Guide

MLD snooping
MLD snooping enables switches to use the information in MLD packets and generate a forwarding table that associates ports with
multicast groups. When switches receive multicast frames, they forward them to their intended receivers.
OS10 supports MLD snooping on VLAN interfaces. Eective with OS10 release 10.4.3.0, MLD snooping is enabled by default.
Congure MLD snooping
• Enable MLD snooping globally with the ipv6 mld snooping enable command in the CONFIGURATION mode. This command
enables both MLDv2 and MLDv1 snooping on all VLAN interfaces.
• (Optional) You can disable MLD snooping on specic VLAN interfaces using the no ipv6 mld snooping command in the VLAN
INTERFACE mode.
• (Optional) Multicast ood control is enabled by default. To disable the multicast ood restrict feature, use the no multicast
snooping flood-restrict command in CONFIGURATION mode. To reenable the feature globally, use the ip igmp
snooping enable command in CONFIGURATION mode.
• In a network, the snooping switch is connected to a multicast Router that sends MLD queries. On a Layer 2 network that does not
have a multicast router, you can congure the snooping switch to act as querier. Use the ipv6 mld snooping querier command
in the VLAN INTERFACE mode to send the queries.
• OS10 learns the multicast router interface dynamically based on the interface on which MLD membership query is received. To assign a
multicast router interface statically, use the
ipv6 mld snooping mrouter interface interface—type command in VLAN
INTERFACE mode.
• (Optional) Congure the MLD version using the ipv6 mld version version-number command in the VLAN INTERFACE
mode.
• (Optional) The fast leave option allows the MLD snooping switch to remove an interface from the multicast group immediately on
receiving the leave message. Enable fast leave with the ipv6 mld snooping fast-leave command in VLAN INTERFACE mode.
• (Optional) Congure the time interval for sending MLD general queries with the ipv6 mld snooping query-interval
query-interval-time command in VLAN INTERFACE mode.
• (Optional) Congure the maximum time for responding to a query advertised in MLD queries using the ipv6 mld snooping
query-max-resp-time query-response-time command in VLAN INTERFACE mode.
• (Optional) Congures the time interval between group-specic MLD query messages with the ipv6 mld snooping last-
member-query-interval query-interval-time command in VLAN INTERFACE mode.
MLD snooping conguration
OS10(config)# ipv6 mld snooping enable
OS10(config)# interface vlan 11
OS10(conf-if-vl-11)# ipv6 mld snooping mrouter interface ethernet 1/1/32
OS10(conf-if-vl-11)# ipv6 mld snooping querier
OS10(conf-if-vl-11)# ipv6 mld version 1
OS10(conf-if-vl-11)# ipv6 mld snooping fast-leave
OS10(conf-if-vl-11)# ipv6 mld snooping query-interval 60
OS10(conf-if-vl-11)# ipv6 mld snooping query-max-resp-time 10
OS10(conf-if-vl-11)# ipv6 mld snooping last-member-query-interval 1000
View MLD snooping information
OS10# show ipv6 mld snooping groups
Total Number of Groups: 280
MLD Connected Group Membership
Group Address Interface Mode
Expires
ff02::2 vlan3531 Exclude
00:01:38
ff0e:225:1:: vlan3531 MLDv1-Compat
00:01:52
Member-ports :port-channel41,ethernet1/1/51,ethernet1/1/52
ff0e:225:1::1 vlan3531 MLDv1-Compat
00:01:52
Multicast
709