Monday, November 8, 2010

Why OSPF Neighbors Stuck in Exstart/Exchange State ?

This is the issue that we face some time & really it get hard or will take the entire day to resolve the issue ...

Let us see the most common reason that Why OSPF Neighbor Stuck in Exstart/ Exchange state.

What happen exactly in Exstart/ Exchange State ?

OSPF neighboring routers establish the relation & move forward ... In this state, the neighboring routers establish a master/slave relationship and determine the initial database descriptor (DBD) sequence number to use while exchanging DBD packets. Once

Now below are the reason that why the neighbor stuck in exstart/ exchange state

1]  MTU Mismatch
2] Same router ID on both router.
3] SequenceNumberMismatch
4] BadLSReq

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