The Layer 2 switch treats the received multicast packet as unknown when there is no explicit group join request from any of the hosts for the destination group. The unknown multicast traffic is either forward to all ports (except the ingress port) within the VLAN or discard it.

A new command “l2 unknown mcast (flood|discard)” is introduced to implement it.

This feature is supported on Qumran1 series platforms, and Qumran2 series platforms.

If flood is enabled, the switch forwards multicast traffic to all ports (except the ingress port) within the VLAN, treating it similar to broadcast traffic. This ensures that even if the switch is not aware of the multicast group memberships for certain ports, all devices within the VLAN receive the multicast packets.

If discard enabled, the switch do not forward multicast traffic for groups with no known members. Instead of flooding the multicast packets to all ports within the VLAN, the switch simply drops or discards the unknown multicast traffic.

The feature reduces the traffic at the egress node and efficiently uses the hardware resources.

Before configuring this command, make sure bridge is configured.

Configure the following command to enable the desired option for the unknown multicast traffic in any snooping configurations. For example, include the command in the IGMP Snooping Configuration or MLD Snooping Configuration to drop the multicast traffic.

 

Use this command to forward the unknown multicast traffic to all ports (except the ingress port) within the VLAN or drop it.

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L2 unknown multicast traffic is flooded.

Configuration mode

This command was introduced in the OcNOS version 6.5.1.

The following command forwards the multicast traffic to all ports