Synchronization limitations
- If a neighbor device is inactive for 30 seconds, and if the standby module takes over in another 10 seconds, the neighbor device cannot be dropped. The inactivity timer starts again and takes another 40 seconds to drop the neighbor device.
- In standby module, the valid neighbor states are loading, down, 2way, and full. If the active management processor (MP) fails when the neighbor state is loading, the standby module cannot continue from loading, but the standby can continue from 2way and tries to establish adjacency between the neighboring devices.
- The minimum OSPF dead-interval timer value is 40 seconds. When the dead-interval value is configured to less than this minimum value, OSPF NSR cannot be supported.