Configure IP Multicast over Fabric Connect within the GRT

Use this procedure to configure IP Multicast over Fabric Connect within the GRT. The default is disabled.

  • Note

    Note

    • You do not have to enable IP Shortcuts to support IP multicast routing in the GRT using SPBM.

    • You cannot enable IP PIM when IP Multicast over Fabric Connect is enabled on the VLAN.

Before you begin

  • You must configure the required SPBM and IS-IS infrastructure, which includes the creation of SPBM B-VLANs.

  • You must create the C-VLANs and add slots/ports.

  • You must enable IP Multicast over Fabric Connect globally.

  • If no IP interface exists on the VLAN, then you create one. (The IP interface must be the same subnet as the IGMP hosts that connect to the VLAN).

About this task

With IP Multicast over Fabric Connect within the GRT, routing of IP multicast traffic is allowed within the subset of VLANs in the GRT that have IP Multicast over Fabric Connect enabled. When you enable IP Multicast over Fabric Connect on a VLAN, the VLAN automatically becomes a multicast routing interface.

You must configure ip spb-multicast enable on each of the VLANs within the GRT that need to support IP multicast traffic. The default is disabled. After you enable IP Multicast over Fabric Connect on each of the VLANs within the GRT that need to support IP multicast traffic, any IGMP functions required for IP Multicast over Fabric Connect within the GRT are automatically enabled. You do not need to configure anything IGMP related.

If you only want to use IP Multicast over Fabric Connect, you do not need to enable the Layer 3 VSN or redistribute unicast routes into or out of IS-IS. IP Multicast over Fabric Connect routing does not depend on unicast routing, which allows for you to more easily migrate from a PIM environment to IP Multicast over Fabric Connect. You can migrate a PIM environment to IP Multicast over Fabric Connect first and then migrate unicast separately or not at all.

The switch only supports IPv4 addresses with IP Multicast over Fabric Connect.

Procedure

  1. Enter Interface Configuration mode:

    enable

    configure terminal

    interface GigabitEthernet {slot/port[/sub-port][-slot/port[/sub-port]][,...]} or interface vlan <1–4059>

    Note

    Note

    If the platform supports channelization and the port is channelized, you must also specify the sub-port in the format slot/port/sub-port.

  2. Create an IP interface on the VLAN:

    ip address <A.B.C.D/X>

  3. Enable IP Multicast over Fabric Connect:

    ip spb-multicast enable

    Note

    Note

    After you configure ip spb-multicast enable, you cannot enable IGMP, IGMP Snooping, or IGMP proxy on the interface. If you try to enable IGMP Snooping or proxy on any interface where IP Multicast over Fabric Connect is enabled, an error message displays.

    Note

    Note

    When you configure ip spb-multicast enable on the Controller node of a DvR domain, the configuration is automatically pushed to the Leaf nodes within the domain.

  4. Optional: Disable IP Multicast over Fabric Connect:

    no ip spb-multicast enable

    default ip spb-multicast enable

  5. Ensure IP Multicast over Fabric Connect within the GRT is configured properly:

    show ip igmp interface

    If routed-spb displays under mode, IP Multicast over Fabric Connect within the GRT is properly enabled on the VLAN.

Example

Enable IP Multicast over Fabric Connect within the GRT:

Switch:1>enable
Switch:1#configure terminal
Switch:1(config)#interface vlan 500
Switch:1(config-if)#ip address 192.0.2.1 255.255.255.0
Switch:1(config-if)#ip spb-multicast enable   
Switch:1#show ip igmp interface

=========================================================================================
                         Igmp Interface - GlobalRouter
=========================================================================================
       QUERY              OPER            QUERY   WRONG              LASTMEM
IF     INTVL STATUS VERS. VERS QUERIER    MAXRSPT QUERY JOINS ROBUST QUERY   MODE   L2ISID SCOPE 
                                                                                           ISID
-------------------------------------------------------------------------------------------------
V500   125    active 2     2   0.0.0.0    100     0     0     2      10    routed-spb
V2000  125    inact  2     2   0.0.0.0    100     0     0     2      10  

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