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Cisco Bug: CSCvv39213 - ISIS RFC 5306 Restart Signalling that uses SA bit in hellos - Issue on dual RP router with NSR

Last Modified

Sep 16, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

7.1.2.ROUT 7.2.1.ROUT

Description (partial)

Symptom:
When router comes back up after being power cycled or reloaded, momentary traffic loss (about 1 second) can happen during that process, even when ISIS is configured with OverLoad bit or MaxMetric on startup.

Conditions:
The problem can only happen with NSR enabled in ISIS configuration.

It may then be seen on platforms where linecard boot process is significantly longer than standby RP boot process.
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