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Cisco Bug: CSCvs02699 - ISIS uses 2 SRv6 SIDs for uloop avoidance on PE

Last Modified

Sep 02, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases


Description (partial)


When performing SRv6 microloop avoidance ISIS will impose as many SIDs as needed on the primary path, up to the platform limit. For the NCS5500 this is 2. However, if the router is serving as a PE it may already be imposing one SID for the overlay service which can result in trying to impose more SIDs than the platform hardware can support.

SRv6 PE node with isis segment-routing microloop avoidance configured.
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