Chapter 24
| 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.
Table 136: 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
proxy-reporting
Enables MLD Snooping with Proxy Reporting 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
unsolicited-report-interval
Specifies how often the upstream interface should
transmit unsolicited IGMP reports (when proxy reporting is
enabled)
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 ipv6 mld snooping
groups dynamic
Clears multicast group information dynamically learned
through MLD snooping
PE
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