Cisco SD208T-NA Administration Manual page 201

Configuring Multicast Forwarding
MLD Snooping
STEP 1
STEP 2
STEP 3
STEP 4
Cisco Small Business 200 Series Smart Switch Administration Guide
Hosts use the MLD protocol to report their participation in Multicast sessions.
The switch supports two versions of MLD snooping:
• MLDv1 snooping detects MLDv1 control packets, and sets up traffic
bridging, based on IPv6 destination Multicast addresses.
• MLDv2 snooping uses MLDv2 control packets to forward traffic based on
the source IPv6 address, and the destination IPv6 Multicast address.
The actual MLD version is selected by the Multicast router in the network.
In an approach similar to IGMP snooping, MLD frames are snooped as they are
forwarded by the switch from stations to an upstream Multicast router and vice
versa. This facility enables a switch to conclude the following:
• On which ports stations interested in joining a specific Multicast group are
located
• On which ports Multicast routers sending Multicast frames are located
This knowledge is used to exclude irrelevant ports (ports on which no stations
have registered to receive a specific Multicast group) from the forwarding set of an
incoming Multicast frame.
If you enable MLD snooping in addition to the manually-configured Multicast
groups, the result is a union of the Multicast groups and port memberships derived
from the manual setup and the dynamic discovery by MLD snooping. Only static
definitions are preserved when the system is rebooted.
To enable MLD Snooping:
Click Multicast > MLD Snooping. The
Enable or disable MLD Snooping Status. When MLD Snooping is globally
enabled, the device monitoring network traffic can determine which hosts have
requested to receive Multicast traffic. The switch performs MLD Snooping only if
both MLD snooping and Bridge Multicast filtering are enabled.
Select a VLAN, and click Edit. The
Enter the parameters.
• VLAN ID—Select the VLAN ID.
• MLD Snooping Status—Enable or disable MLD snooping on the VLAN. The
switch monitors network traffic to determine which hosts have asked to be
sent Multicast traffic. The switch performs MLD snooping only when MLD
snooping and Bridge Multicast filtering are both enabled
MLD Snooping
page opens.
Edit MLD Snooping
page opens.
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