Cisco Bug: CSCtc73440 - Changing interface ip address/mask triggers a bad OSPF route
Feb 28, 2018
- Cisco IOS
Known Affected Releases
None Symptom: When the IP address/mask of an interface that OSPFv2 is using as the next hop for a route is changed such that the nexthop IP address no longer falls within the interface subnet, OSPF may install a recursive path (i.e. one with no interface) in the RIB. These recursive routes can persist even after OSPF runs subsequent SPF calculations. Conditions: In order for this problem to be seen the ip address/mask configuration change must occur within a specific time window during an SPF calculation. Small or moderate sized networks (<10,000 OSPF routes) are unlikely to see this. Also, IOS releases that have the OSPF local RIB feature are not vulnerable..
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