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Cisco Bug: CSCvv17419 - SR-TE forwarding misprogrammed after changing segment-list config

Last Modified

Oct 13, 2020

Products (14)

  • Cisco ASR 9000 Series Aggregation Services Routers
  • Cisco Network Convergence System 55A2-MOD-HD-S
  • Cisco Network Convergence System 5504
  • Cisco Network Convergence System 5502-SE
  • Cisco Network Convergence System 5508
  • Cisco Network Convergence System 5516
  • Cisco IOS XR Software
  • Cisco Network Convergence System 5502
  • Cisco Network Convergence System 55A1-24H
  • Cisco Network Convergence System 55A2-MOD-S
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Known Affected Releases


Description (partial)

Some of the symptoms include:

- Traffic is temporarily blackholed until SR-TE policy finishes converging
- Traffic temporarily ends up going to unintended destination until SR-TE policy finishes converging

In order to hit this issue, the following must apply:

- Using a configured SR-TE policy to steer traffic (through any supported steering mechanism)
- The SR-TE policy is using an explicitly configured segment list

In order to trigger the condition, the configuration of the explicit segment list must be changed in a way that includes both deletes and creation/modify in a single configuration commit; for example, going from two labels (20000, 15000) in the segment list to just one (21000). The resulting label stack must be different to hit this condition.
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Bug Details Include

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