Alloy AS5010-P, User Manual

Page: 162 / 435

AS Series User Manual
161
Doc No.: AS5-0116-01
MLD Snooping
Multicast Listener Discovery (MLD) snooping constrains the flooding of IPv6 multicast traffic on
VLANs on a switch. When MLD snooping is enabled on a VLAN, the AS Series Switches examine MLD
messages between hosts and multicast routers and learn which hosts are interested in receiving
traffic for a multicast group. Based on what it learns, the switch then forwards multicast traffic only
to those interfaces in the VLAN that are connected to interested receivers instead of flooding the
traffic to all interfaces.
By default, a switch floods Layer 2 multicast traffic on all interfaces on a switch, except for the
interface that is the source of the multicast traffic. This behaviour can consume significant amounts
of bandwidth.
You can enable MLD snooping to avoid this flooding. When you enable MLD snooping, the switch
monitors MLD messages between receivers and multicast routers and uses the content of the
messages to build an IPv6 multicast forwarding table—a database of IPv6 multicast groups and the
interfaces that are connected to members of the groups. When the switch receives multicast traffic
for a multicast group, it uses the forwarding table to forward the traffic only to interfaces that are
connected to receivers that belong to the multicast group.
The AS Series switches support MLD v1 and v2.
Basic Configuration
This section is used to enable and configure MLD Snooping on the AS Series switches.
Information
To configure the MLD Snooping parameters via the Web Interface:
1. Click Configuration > IPMC > MLD Snooping > Basic Configuration
2. Select to enable or disable MLD Snooping on the switch.
3. Configure ports to be Router Ports, Fast Leave Ports and select whether you would like to
enable throttling.
4. Click the Apply button to save your changes or the Reset button to revert to previous
settings.