Configuring the Global Routing Table timeout value

Use this procedure to configure the timeout value in the GRT. The timeout value ages out the sender when there are no multicast streams coming from the sender for a specified period of time in seconds. The default timeout value is 210 seconds.

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.

Procedure

  1. Enter IS-IS Router Configuration mode:

    enable

    configure terminal

    router isis

  2. Configure the IP Multicast over Fabric Connect forward-cache timeout:

    spbm <1–100> multicast fwd-cache-timeout(seconds) <10–86400>

  3. Optional: Configure the IP Multicast over Fabric Connect forward-cache timeout to the default value of 210 seconds:

    default spbm <1–100> multicast fwd-cache-timeout(seconds)

    no spbm <1–100> multicast fwd-cache-timeout(seconds)

Example

Configure the IP Multicast over Fabric Connect forward-cache timeout to 300:

Switch:1>enable
Switch:1#configure terminal
Switch:1(config)#router isis
Switch:1(config-isis)#spbm 1 multicast 1 fwd-cache-timeout 300
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