Multicast Listener Discovery (Mld) Snooping - TRENDnet TI-PG1284i User Manual

TRENDnet User's Guide

Multicast Listener Discovery (MLD) Snooping

Multicast Listener Discovery Snooping is an IPv6 multicast constraining mechanism that
runs on layer 2 switches to manage and control IPv6 multicast groups. With MLDS, IPv6
multicast data is selectively forwarded to a list of ports that want to receive the data,
instead of being flooded to all ports in a VLAN. This list is constructed by snooping IPv6
multicast control packets. In general, significant bandwidth can be wasted by flooding.
Functionality
Presently our layer 2 switches support IGMP Snooping in IPV4. IGMP snooping to limit the
flooding of multicast traffic by dynamically configuring Layer 2 interfaces so that multicast
traffic is forwarded to only those interfaces associated with IP multicast devices.
The functionality of IGMP Snooping in IPv4 version is same as MLD Snooping in IPv6
version.
MLDS supports two versions:
 MLDv1 snooping detects MLDv1 control packets and sets up traffic bridging based on
IPv6 destination multicast addresses.
 MLDv2 basic snooping uses MLDv2 control packets to set up traffic forwarding based
on IPv6 destination multicast addresses.
Proxy reporting:
All the hosts send their complete multicast group membership information to the
multicast router in response to queries. The switch snoops these responses, updates the
database and forwards the reports to the multicast router. To prevent the multicast
router from becoming overloaded with reports, MLD snooping does proxy reporting.
Proxy reporting forwards only the first report for a multicast group to the router and
suppresses all other reports for the same multicast group.
Report-suppression-interval
Only one report is forwarded within the report forward interval for a particular group.
Querier:
When enabled, the MLD snooping querier sends out periodic MLD queries that trigger
MLD report messages from the switch that wants to receive IP multicast traffic. MLD
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snooping listens to these MLD reports to establish appropriate forwarding. You can
enable the MLD snooping querier on all the switches in the VLAN, but for each VLAN that
is connected to switches that use MLD to report interest in IP multicast traffic, you must
configure at least one switch as the MLD snooping querier.
CLI Configuration
Node Command
enable show mld-snooping
information
enable show mld-snooping group
configure mld-snooping enable
configure no mld-snooping enable
configure mld-snooping proxy enable
configure no mld-snooping proxy
enable
configure mld-snooping forward-
mode (ip|mac)
configure no mld-snooping forward-
mode
configure mld-snooping router-
interval <60-600>
configure no mld-snooping router-
interval
configure mld-snooping port-interval
<130-1225>
configure no mld-snooping port-
interval
TI-PG1284i
Description
This command displays the current MLD
configurations.
This command displays the current MLD
group information.
This command enables the MLD Snooping.
This command disables the MLD Snooping.
This command enables the MLD Snooping
Proxy. (Default: disable)
This command disables the MLD Snooping
Proxy.
This command configures the MLD
Snooping forward mode.
This command resets the MLD Snooping
forward mode to MAC base forward.
This command configures the MLD
Snooping router interval.
This command resets the MLD Snooping
router interval to 125 seconds.
This command configures the MLD
Snooping port interval.
This command resets the MLD Snooping
port interval to 260 seconds.
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