Summary
NNI adjacencies formed via auto-sense with IS-IS Hello Authentication may not re-establish after a switch reboot. This is characterized by the auto-sense state for the port remaining in NNI-Auth-Fail on one side of the link and NNI-ONBOARDING on the other. The IS-IS adjacency can be re-established by toggling the administrative state of the link (down/up).
Impact
Loos of IS-IS adjacency (NNI) between nodes after reboot
Products Affected
- All VSP
- All Universal Switching Platforms running Fabric Engine
Software Affected
- VOSS/Fabric Engine 9.1.1.0
- VOSS/Fabric Engine 9.1.2.0
Symptoms
- Dynamic IS-IS adjacency (auto-sense) does not establish after reboot
- Auto-sense port state is NNI-AUTH-FAIL on one side of the link and NNI-ONBOARDING on the other
- IS-IS adjacency recovers when administrative state of the port is toggled
Workaround
Impacted adjacencies can be recovered by an administrative 'shutdown' and 'no shutdown' of the port as bouncing the port state restarts the auto-sense port state machine on both ends of the link.
Solution
This issue can be avoided with deployment of the following releases in place of the affected versions:
- VOSS/Fabric Engine 9.2.0.0 or later code
- VOSS/Fabric Engine 9.1.3.0 or later code (when available)
Please see the full field notice here for more details and future updates.
