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Configuration Guide - Reliability

CloudEngine 8800, 7800, 6800, and 5800 V200R003C00

This document describes the configurations of Reliability, including BFD Configuration, VRRP Configuration, DLDP Configuration, Smart Link and Monitor Link Configuration, EFM Configuration, and CFM Configuration.
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BFD Session Cannot Go Up

BFD Session Cannot Go Up

Common Causes

This fault is commonly caused by one of the following:

  • The link carrying the BFD session is faulty. As a result, BFD packets cannot be exchanged.

  • The BFD session flaps frequently.

Procedure

  1. Run the display current-configuration configuration bfd command to check whether the local and remote discriminators at both ends match.

    • If the local and remote discriminators at both ends match, go to step 2.

    • If the local and remote discriminators at both ends do not match, run the discriminator command to correctly configure the local and remote discriminators, and then run the display bfd session all command to check whether the BFD session is Up.
      • If the value of the State field is Up, the BFD session has been established.

      • If the value of the State field is not Up, go to step 2.

  2. Run the display current-configuration configuration bfd command to check whether the BFD detection time is longer than the delay before the BFD session goes Up.

    Detection time = Received Detect Multi of the remote system x Max (Local RMRI/Received DMTI), where Detect Multi is the local detection multiplier and is set by using the detect-multiplier command. The Required Min Rx Interval (RMRI) is the interval for receiving BFD packets, which is set by using the min-rx-interval command. The Desired Min Tx Interval (DMTI) is the interval for transmitting BFD packets, which is set by using the min-tx-interval command.

    The link delay can be obtained using the ping or tracert mechanism.

    If the BFD detection time is shorter than the delay before the BFD session goes Up, run the detect-multiplier, min-rx-interval, and min-tx-interval commands to increase the BFD detection time to be longer than the delay.

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Updated: 2019-05-08

Document ID: EDOC1100004359

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