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Cisco Bug: CSCul54254 - OSPFv3 may not flush some apparently self-originated LSAs

Last Modified

Feb 13, 2018

Products (1)

  • Cisco IOS

Known Affected Releases

12.3(1a)

Description (partial)

Symptom: Invalid LSAs are not flushed by the router which has their Advertising Router
ID. Specifically, Router LSAs which do not have LSID of 0 will not be flushed 
if the router does not re-originate them, and any LSA with a type that the 
router does not recognize.

Lingering LSAs could lead to incorrect routing in some very obscure instances. 
For example, stale Router LSA fragments from two neighboring routers would 
need to remain in the network. There would not be a routing problem if only 
one router's stale Router LSA fragment was allowed to linger.
Conditions: There are several possible scenarios that could lead to this symptom. One example is that a router is configured with many interfaces attached 
to an OSPFv3 instance such that it originates more than one Router LSA 
fragment. Then the router is reloaded before the configuration is saved, 
and after the reload it does not reoriginate some of the Router LSA 
fragments.
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