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NE40E V800R010C10SPC500 Configuration Guide - IP Multicast 01

This is NE40E V800R010C10SPC500 Configuration Guide - IP Multicast
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(Optional) Modifying State-Refresh control parameters

(Optional) Modifying State-Refresh control parameters

This section describes how to modify State-Refresh control parameters. You can configure the interval at which State-Refresh messages are sent, the timeout period for receiving the next State-Refresh message, and the TTL of State-Refresh messages.

Context

On a PIM-DM network, the periodic flooding-pruning wastes lots of network resources. To avoid that the pruned interface is restored to forward packets because the Prune timer expires, you can enable the NE40E to send State-Refresh messages periodically, refresh the Prune state of the interfaces, and maintain the SPT. The NE40E allows you to modify the State-Refresh parameters according to the network environment. If there is no special requirement, the default value is recommended.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run pim

    The PIM view is displayed.

  3. Run state-refresh-interval interval

    The interval at which the router sends State-Refresh messages is configured.

    By default, the interval is 60s.

    NOTE:
    • This command applies to the first hop router closest to the multicast source.
    • The interval at which Status-Refresh messages are sent must be shorter than the expiration time of the Prune state. You can run the holdtime join-prune command to configure the expiration time of the Prune state.

  4. Run state-refresh-rate-limit interval

    The timeout period for receiving the next State-Refresh message is configured.

    By default, the timeout period for a router to receive the next State-Refresh message is 30s.

    On a PIM-DM network, it is possible for a router to receive State-Refresh messages from more than one router. Some of these messages are duplicate. When a router with the state-refresh-rate-limit command configuration receives the first State-Refresh message, it immediately resets the Prune timer and starts the State-Refresh timer. The lifetime of the State-Refresh timer is equal to the timeout period for receiving the next State-Refresh message.
    • Before the timer expires, the router discards the repeated State-Refresh messages it receives.

    • After the State-Refresh timer times out, the router is allowed to receive the next State-Refresh message.

  5. Run state-refresh-ttl ttl-value

    The TTL of State-Refresh messages to be sent is configured.

    By default, the TTL of State-Refresh messages to be sent is 255.

    On a PIM-DM network, the router deducts 1 from the TTL of a received State-Refresh message, and then sends the message to the downstream device. When the TTL is decreased to 0, the message is not forwarded. On a small-scale network, State-Refresh messages are transmitted circularly on the network. You can modify the TTL according to the network scale by running the state-refresh-ttl command.

    NOTE:

    This command takes effect only on the router directly connected to the multicast source.

  6. Run commit

    The configuration is committed.

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Updated: 2019-01-03

Document ID: EDOC1100055017

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