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Microloop Avoidance in SRv6 Networks

Enable a post convergence path calculation on a device to avoid microloops if a link or metric change occurs in an SRv6 network. To configure microloop avoidance in an SRv6 network for both local and remote network events including link down, link-up, and metric-change, include the microloop avoidance post-convergence-path delay millisecondsstatement at the [edit protocols isis spf-options] hierarchy level. For effective microloop avoidance, configure this feature on all the nodes in the network.

Note:

Micro-loop avoidance is not a replacement for local repair mechanisms like TI-LFA which detects local failure very fast and activates a pre-computed loop-free-alternative path.

Benefits of Microloop Avoidance in SRv6

  • Micro loop-free path avoids delays and traffic loss

  • Microloop avoidance can prevent forwarding of looping packets and avoid wasteful bandwidth consumption
  • Microloop avoidance path is computed only for the impacted links in case of multiple link failures. If the second link failure does not impact the computed microloop avoidance path, IS-IS continues to use the same microloop avoidance path.

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