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Cisco Bug: CSCvv44350 - After router reload breakout ports creation failure at remote LC

Last Modified

Sep 04, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases


Description (partial)


data out of sync between IM (interface manager) and FIB (or CEF). An interface may be found in 'show cef interface <name>', but not in 'show im database interface <name>'

This is more likely to occur when interface breakout mode is enabled. When a high bandwidth interface, like FortyG Ethernet interface is momentarily created, then quickly deleted, in order to create 4 HundredG Ethernet interfaces.

Also, it also requires multiple back-to-back LC reloads. It can only happens on the remote LCs, ie, non-reloading LCs, when this sequence occurs,

1 - interface create, ie, configured
2 - hardware programming failure happened in FIB
3 - FIB goes into retry
4 - interface delete, ie, unconfigured, before retry succeeds, then we hit the issue. Otherwise, it's fine.
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