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Cisco Bug: CSCup77017 - Protect sending spurious triggers and/or causing protect-server crash

Last Modified

Jul 21, 2018

Products (8)

  • Cisco Carrier Routing System
  • Cisco ASR 9922 Router
  • Cisco IOS XR Software
  • Cisco ASR 9010 Router
  • Cisco ASR 9904 Router
  • Cisco ASR 9006 Router
  • Cisco ASR 9001 Router
  • Cisco ASR 9912 Router

Known Affected Releases


Description (partial)

The protect database is not cleaned up properly after interface/controller flaps causing spurious protect triggers and process crashes in some cases.

When the protect-server is configured with some interface handle, this problem is not seen initially. Once the interface handle is un-configured (interface/controller is DOWN) and configured (interface/controller is UP) again, the protect database is not cleaned up properly, causing the database to be in inconsistent state. Because all of the data for interface is not freed, and sometimes memory chunks are reused, it is creating spurious fast-reroute triggers in which fast-reroute is activated for interfaces that have not gone down.

If it happens to be invalid memory (partially freed data structures), it leads to protect-server-process crash.

Issue can happen with neighbor router reloads or link flaps of POS, GE, or TENGIGE interfaces.
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