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Cisco Bug: CSCuo73936 - SR:Micro loop on remote I/F shut, when new NH is NOT LFA

Last Modified

Jun 10, 2018

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases

5.2.2.BASE 5.2.2.ROUT

Description (partial)

Symptom:
Suppose a path (next-hop and an outgoing interface) for prefix is protected by remote LFA or ti-LFA
Suppose microloop avoidance is enabled using "microloop avoidance" under ipv4 address family
If the the link that is protected is manually brougt down through  configuration by shutting down the interface on the far end of the link, then microloop avoidance may not work even when "microloop avoidance" is configured with the maximum delay and there is a remote LFA or ti-LFA already programmed in the forwarding plane

this problem does NOT occur if the link is broken (e.g. fiber cut) or if BFD is configured with aggressive timers and hardware offload, provided that the hardware supports BFD offload

Conditions:
No specific conditions
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