ECS4110-28P_Management Guide

C HAPTER 40 | Multicast Filtering Commands
MLD Snooping
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MLD SNOOPING
Multicast Listener Discovery (MLD) snooping operates on IPv6 traffic and
performs a similar function to IGMP snooping for IPv4. That is, MLD
snooping dynamically configures switch ports to limit IPv6 multicast traffic
so that it is forwarded only to ports with users that want to receive it. This
reduces the flooding of IPv6 multicast packets in the specified VLANs.
There are two versions of the MLD protocol, version 1 and version 2.
MLDv1 control packets include Listener Query, Listener Report, and
Listener Done messages (equivalent to IGMPv2 query, report, and leave
messages). MLDv2 control packets include MLDv2 query and report
messages, as well as MLDv1 report and done messages.
Remember that IGMP Snooping and MLD Snooping are independent
functions, and can therefore both function at the same time.
N OTE : Due to an ASIC limitation in the ECS4110-52T, MLDv2 reports with
source list is not supported. The switch can only process IS_EX (is
excluded), TO_EX (change to excluded), and TO_IN (change to included)
records without source list.
Table 171: MLD Snooping Commands
Command Function Mode
ipv6 mld snooping Enables MLD Snooping globally GC
ipv6 mld snooping querier Allows the switch to act as the querier for MLD
snooping
GC
ipv6 mld snooping
query-interval
Configures the interval between sending MLD general
query messages
GC
ipv6 mld snooping query-
max-response-time
Configures the maximum response time for a general
queries
GC
ipv6 mld snooping
robustness
Configures the robustness variable GC
ipv6 mld snooping
router-port-expire-time
Configures the router port expire time GC
ipv6 mld snooping
unknown-multicast mode
Sets an action for unknown multicast packets GC
ipv6 mld snooping
version
Configures the MLD Snooping version GC
ipv6 mld snooping vlan
immediate-leave
Removes a member port of an IPv6 multicast service
if a leave packet is received at that port and MLD
immediate-leave is enabled for the parent VLAN
GC
ipv6 mld snooping vlan
mrouter
Adds an IPv6 multicast router port GC
ipv6 mld snooping vlan
static
Adds an interface as a member of a multicast group GC
clear ip igmp snooping
groups dynamic
Clears multicast group information dynamically
learned through MLD snooping or MVR6
PE
clear ip igmp snooping
statistics
Clears clears IGMP snooping statistics PE