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Forum Replies

  1. Kishor,
    I assume you mean the “ExStart” or “Exchange” state, so I will write about those. If OSPF is having an authentication problem, you will not see the routers stuck in ExStart or Exchange. In fact, you won’t see anything at all. The output for “show ip ospf neighbors” will just be blank (if a neighbor relationship hadn’t already formed). If a neighbor relationship already formed, and then an authentication problem is introduced, the neighbors will just drop once the dead interval is reached. The reason, in both cases, is because if there is an authent

    ... Continue reading in our forum

  2. Below is my scenario with 2 Routers and each router configured with 3 loopback interface and two Fast Ethernet interfaces are up.
    (Router A - loopback networks:,, and Fast Ethernet 0/1 and Fast Ethernet 0/0

     (	     (
        Router A  			Router B
            ----------Down staste----------
    	----------init staste----------
    	----------two-way staste-------
    	----------extart staste--------

    After master Slave negotiation, Router A considered as Slave and send below DBD packet wi

    ... Continue reading in our forum

  3. very good explanation thanks!

  4. Hello Laz,

    Well explained, let me do the labbing for the same topology.
    Thanks alot.


  5. I got it,
    thanks, Laz

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