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CLI-based Configuration Guide - IP Unicast Routing

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010

This document describes the concepts and configuration procedures of IP Service features on the device, and provides the configuration examples.
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Configuring BFD for OSPF

Configuring BFD for OSPF

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run ospf [ process-id ]

    The OSPF view is displayed.

  3. Run bfd all-interfaces enable

    BFD for OSPF is enabled to establish the BFD session.

    If all the interfaces in a certain process are configured with BFD and their neighbor relationships are in the Full state, OSPF establishes BFD sessions on all the interfaces in the process.

    Run the bfd all-interfaces { min-rx-interval receive-interval | min-tx-interval transmit-interval | detect-multiplier multiplier-value | frr-binding } * command to set parameters for BFD sessions.
    • The parameter min-rx-interval receive-interval specifies the expected minimum interval for receiving BFD packets from the neighbor.
    • The parameter min-tx-interval transmit-interval specifies the minimum interval for sending BFD packets to the neighbor.
    • The parameter detect-multiplier multiplier-value specifies the local detection multiplier.
    • The parameter frr-binding indicates that the status of the BFD session is bound to OSPF IP FRR.
    NOTE:

    If only the bfd all-interfaces { min-rx-interval receive-interval | min-tx-interval transmit-interval | detect-multiplier multiplier-value | frr-binding } * command is run to set BFD parameters, and the bfd all-interfaces enable command is not run, BFD cannot be enabled.

    AR150&AR160&AR200 series do not support OSPF IP FRR.

    You can skip this step. The default interval at which BFD packets are transmitted and the default detection multiplier are recommended.

    The parameters are configured based on the network status and network reliability requirements. A short interval at which BFD packets are transmitted can be configured if high network reliability is required. A long interval at which BFD packets are transmitted can be configured if high network reliability is not required.

    NOTE:
    • Actual interval at which BFD packets are transmitted on the local router = Max { configured interval transmit-interval at which BFD packets are transmitted on the local router, configured interval receive-interval at which BFD packets are received on the peer router }
    • Actual interval at which BFD packets are received on the local router = Max { configured interval transmit-interval at which BFD packets are transmitted on the peer router, configured interval receive-interval at which BFD packets are received on the local router }
    • Actual time for detecting BFD packets = Actual interval at which BFD packets are received on the local router x Configured detection multiplier multiplier-value on the peer router

    For example:

    • On the local router, the configured interval at which BFD packets are transmitted is 200 ms; the configured interval at which BFD packets are received is 300 ms; the detection multiplier is 4.
    • On the peer router, the configured interval at which BFD packets are transmitted is 100 ms; the interval at which BFD packets are received is 600 ms; the detection multiplier is 5.

    Then:

    • On the local router, the actual interval at which BFD packets are transmitted is 600 ms calculated by using the formula max {200 ms, 600 ms}; the interval at which BFD packets are received is 300 ms calculated by using the formula max {100 ms, 300 ms}; the detection period is 1500 ms calculated by multiplying 300 ms by 5.
    • On the peer router, the actual interval at which BFD packets are transmitted is 300 ms calculated by using the formula max {100 ms, 300 ms}, the actual interval at which BFD packets are received is 600 ms calculated by using the formula max {200 ms, 600 ms}, and the detection period is 2400 ms calculated by multiplying 600 ms by 4.

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Updated: 2019-05-20

Document ID: EDOC1100034072

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