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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)

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.

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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