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Dell EMC SmartFabric OS10 User Guide Release 10.5.1

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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. Effective with OS10 release 10.4.3.0, MLD snooping is enabled by default.

Configure 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 specific VLAN interfaces using the no ipv6 mld snooping command in the VLAN INTERFACE mode.
  • (Optional) Multicast flood control is enabled by default. To disable the multicast flood 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 configure 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) Configure 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) Configure the time interval for sending MLD general queries with the ipv6 mld snooping query-interval query-interval-time command in VLAN INTERFACE mode.
  • (Optional) Configure 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) Configures the time interval between group-specific MLD query messages with the ipv6 mld snooping last-member-query-interval query-interval-time command in VLAN INTERFACE mode.
MLD snooping configuration
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
  Member-ports :port-channel41,ethernet1/1/51,ethernet1/1/52
ff0e:225:1::2                 vlan3531                      MLDv1-Compat                  00:01:52
  Member-ports :port-channel41,ethernet1/1/51,ethernet1/1/52
ff0e:225:1::3                 vlan3531                      MLDv1-Compat                  00:01:52
  Member-ports :port-channel41,ethernet1/1/51,ethernet1/1/52
ff0e:225:1::4                 vlan3531                      MLDv1-Compat                  00:01:52
  Member-ports :port-channel41,ethernet1/1/51,ethernet1/1/52
ff0e:225:1::5                 vlan3531                      MLDv1-Compat                  00:01:52
  Member-ports :port-channel41,ethernet1/1/51,ethernet1/1/52
ff02::2                       vlan3532                      Exclude                       00:01:47
ff0e:225:2::                  vlan3532                      MLDv1-Compat                  00:01:56
  Member-ports :port-channel41,ethernet1/1/51,ethernet1/1/52
ff0e:225:2::1                 vlan3532                      MLDv1-Compat                  00:01:56
  Member-ports :port-channel41,ethernet1/1/51,ethernet1/1/52
ff0e:225:2::2                 vlan3532                      MLDv1-Compat                  00:01:56
  Member-ports :port-channel41,ethernet1/1/51,ethernet1/1/52
--more--
<<Output Truncated>>
OS10# show ipv6 mld snooping interface vlan 3031
Vlan3031 is up, line protocol is up
MLD version is 2
MLD snooping is enabled on interface
MLD snooping query interval is 60 seconds
MLD snooping querier timeout is 130 seconds
MLD snooping last member query response interval is 1000 ms
MLD snooping max response time is 10 seconds
MLD snooping fast-leave is disabled on this interface
MLD snooping querier is disabled on this interface
OS10# show ipv6 mld snooping interface vlan 2
Vlan2 is up, line protocol is up
MLD version is 2
MLD snooping is enabled on interface
MLD snooping query interval is 60 seconds
MLD snooping querier timeout is 130 seconds
MLD snooping last member query response interval is 1000 ms
MLD snooping max response time is 10 seconds
MLD snooping fast-leave is disabled on this interface
MLD snooping querier is disabled on this interface
Multicast flood-restrict is enabled on this interface
OS10# show ipv6 mld snooping mrouter vlan 11
Interface    Router Ports
Vlan 11      ethernet 1/1/32

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