Chapter 23
| Multicast Filtering Commands
MLD Snooping
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show ip
multicast-data-drop
This command shows if the specified interface is configured to drop multicast data
packets.
Syntax
show ip igmp throttle interface
[interface]
interface
ethernet
unit/port
unit - Unit identifier. (Range: 1)
port - Port number. (Range: 1-10/28)
port-channel
channel-id (Range: 1-8)
Default Setting
None
Command Mode
Privileged Exec
Command Usage
Using this command without specifying an interface displays all interfaces.
Example
Console#show ip multicast-data-drop interface ethernet 1/1
Ethernet 1/1: Enabled
Console#
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.
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