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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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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Configuring BFD for BGP

Configuring BFD for BGP

Context

BGP periodically sends Keepalive messages to its peers to detect the status of its peers. It takes more than 1 second for this detection mechanism to detect a fault. When data is transmitted at gigabit rates, long-time fault detection will cause packet loss. This cannot meet high reliability requirements of carrier-class networks. Association between BGP and BFD can solve this problem. BFD is a millisecond-level fault detection mechanism. It can detect faults on the link between BGP peers within 50 ms. Therefore, BFD can speed up BGP route convergence, ensures fast link switching, and reduces traffic loss.

When a peer joins a peer group on which BFD is enabled, BFD also takes effect on the peer and a BFD session is created on the peer. To prevent BFD from taking effect on the peer, run the peer bfd block command.

By default, Huawei devices establish multi-hop IBGP sessions with each other. When a Huawei device communicates with a non-Huawei device that establishes a single-hop IBGP session by default, you are advised to configure only association between IGP and BFD or association between IBGP and BFD.

NOTE:
BFD for routing protocols can only be configured on GRE tunnel interfaces.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run bfd

    Global BFD is enabled on the local device.

  3. Run quit

    Return to the system view.

  4. Run bgp { as-number-plain | as-number-dot }

    The BGP view is displayed.

  5. Run peer { group-name | ipv4-address } bfd enable

    BFD is configured for the peer or peer group, and default BFD parameters are used to establish BFD sessions.

    If BFD is configured for a peer group, BFD sessions are created for the peers on which the peer bfd block command is not used.

  6. Run peer { group-name | ipv4-address } bfd { min-tx-interval min-tx-interval | min-rx-interval min-rx-interval | detect-multiplier multiplier | wtr wtr-value } *

    BFD session parameters are configured.

  7. (Optional) Run peer ipv4-address bfd block

    The peer is disabled from inheriting the BFD function of the peer group to which the peer belongs.

    NOTE:
    • BFD sessions are established when they are in Established state.
    • If BFD parameters are configured on a peer, BFD sessions are established using these parameters.
    • The peer ipv4-address bfd block and peer ipv4-address bfd enable commands are mutually exclusive.

Verifying the Configuration

  • Run the display bgp bfd session { [ vpnv4 vpn-instance vpn-instance-name ] peer ipv4-address | all } command to check information about the BFD sessions established between BGP peers.

  • Run the display bgp [ vpnv4 vpn-instance vpn-instance-name ] peer [ [ ipv4-address ] verbose ] command to check information about BGP peers.

  • Run the display bgp group [ group-name ] command to check information about the specified BGP peer group.

  • Run the display bgp vpnv4 { all | vpn-instance vpn-instance-name } group [ group-name ] command to check information about the BGP VPNv4 peer group.

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Updated: 2019-05-17

Document ID: EDOC1000174069

Views: 144016

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