Configure IP Multicast over Fabric Connect on a Layer 2 VSN

Use this procedure to enable IP Multicast over Fabric Connect for a Layer 2 VSN. With Layer 2 VSN IP Multicast over Fabric Connect, multicast traffic remains in the same Layer 2 VSN across the SPBM cloud.

Before you begin

Configure the required SPBM and IS-IS infrastructure, which includes the creation of SPBM B-VLANs.
Create the customer VLANs (C-VLANs) and add slots/ports.
Assign the same I-SID to the C-VLANs on all the BEBs where you configure the C-VLAN.
Enable IP Multicast over Fabric Connect globally.

About this task

Traffic is only delivered to UNIs on the Layer 2 VSN where the switch receives IGMP joins and reports. Traffic does not cross the Layer 2 VSN boundary.

No explicit configuration exists for a Layer 2 VSN. After you configure IP IGMP snooping on a VLAN that has an I-SID configured, the device enables that VLAN for IP Multicast over Fabric Connect services.

SPBM supports enabling IGMP snooping on a C-VLAN, but it does not support enabling PIM on a C-VLAN. If you enable IGMP snooping on a C-VLAN, then its operating mode is Layer 2 VSN with IGMP support on the access networks for optimized forwarding of IP multicast traffic in a bridged network.

This switch only supports IPv4 multicast traffic.

Procedure

In the navigation pane, expand Configuration > VLAN.
Select VLANs.
Select the Basic tab.
Select a VLAN.
Select IP.
Select the IGMP tab.
Select the SnoopEnable check box.
Optional: Select the SsmSnoopEnable check box, if you use IGMP version 3.
Optional: Select the ProxySnoopEnable check box.
Optional: If you want to enable IGMP version 3, select version3 in the Version check box.

You must enable SSM snoop before you configure IGMP version 3 and both ssm-snoop and snooping must be enabled for IGMPv3.
If you want to enable IGMP version 2, select version2 in the Version check box.

For IGMP Snooping, ensure that the IGMP version used by multicast hosts and other devices in the network is the same as the IGMP version configured on the IGMP Snooping VLAN, or that you enable compatibility mode.
Optional: If you want to enable snoop querier, select SnoopQuerierEnable.
Optional: If you want to configure an address for IGMP queries, enter the IP address in SnoopQuerierAddr.

Note

This step is not always required. The IGMP Querier on the BEB uses a source address 0.0.0.0 by default. When you do not configure this, a BEB sends IGMP queries on the UNI ports with 0.0.0.0 as the source IP address. Some Layer 2 edge switches do not support a 0.0.0.0 querier. You can use a fictitious IP address as the querier address, and use the same address on all BEBs in the network.
Select Apply.