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Cisco Bug: CSCuw19968 - OSPF lost some summary prefixes

Last Modified

Jul 21, 2018

Products (8)

  • Cisco ASR 9000 Series Aggregation Services Routers
  • Cisco IOS XR Software
  • Cisco ASR 9922 Router
  • Cisco ASR 9010 Router
  • Cisco ASR 9904 Router
  • Cisco ASR 9006 Router
  • Cisco ASR 9001 Router
  • Cisco ASR 9912 Router

Known Affected Releases

5.3.1.ROUT

Description (partial)

Symptom:When adding one more new summary-prefix config in OSPF, some of existing OSPF
summary prefixes despair. this can happen even without adding/removing the config. bottom line here is whenever an event which cause the summary external route generation we can end up flushing, not generating the external summary routes. this happen only in case of external summary routes and not for individual routes.

Conditions:Adding new summary-prefix config in OSPF. result in the issue. and it can happen also when we learn a route or loose a route which falls in the summary range and force an event to generate/flush the summary external lsa.
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