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CLI-based Configuration Guide - IP Unicast Routing

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R009

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Setting the Convergence Priority of OSPF Routes

Setting the Convergence Priority of OSPF Routes

Context

With the integration of network services, different services such as data, voice, and video run on the same network infrastructure, and have different requirements for the network. For Video on Demand (VoD) services, the route convergence speed of the multicast source server is the most critical factor that affects multicast services. It is required that the routes to the multicast source should converge rapidly when network faults occur. On the BGP or MPLS VPN bearer network where OSPF is used to implement the IP connectivity of the backbone network, end-to-end routes between PEs need to be converged rapidly.

You can set priorities for specific routes by setting the convergence priority of OSPF routes so that these routes converge preferentially. This shortens the interruption of key services and improves the reliability of the entire network.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run ospf [ process-id ]

    The OSPF view is displayed.

  3. Run prefix-priority { critical | high | medium } ip-prefix ip-prefix-name

    The convergence priority of OSPF routes is set.

    After the convergence priority of OSPF routes is set, OSPF can calculate and flood LSAs, and synchronize LSDBs according to the priorities. This speeds up route convergence. When an LSA meets multiple priorities, the highest priority takes effect. OSPF calculates LSAs in the sequence of intra-area routes, inter-area routes, and AS external routes. This command makes OSPF calculate route priorities. Convergence priorities are critical, high, medium, and low. During LSA flooding, LSAs are placed into the corresponding critical, high, medium, and low queues according to priorities to speed up the processing of high-priority LSAs.

    NOTE:

    This command takes effect only on the public network.

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Updated: 2019-05-17

Document ID: EDOC1000174069

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