>Jaeheon Yoo <[EMAIL PROTECTED]> provided an excellent answer,
>Hi, Scott.
>
>To monitor ospf adjancency or something like that, we usually have two
>routers connected to each other via Ethernet interfaces in a normal
>lab environment. In this case, before adjacency is built, old router
>LSA lists the Ethenet interface's network as Link Type 3 - "connection
>to a stub network" because no neighbor's found, but after adjacency
>built, new router LSA lists it as Link Type 2 - "connection to a
>transit network".
>
>You can check this with "show ip ospf database router" before and
>after ospf adjacency built.
>
>http://www.isi.edu/in-notes/rfc2328.txt pp.207-208
>
>Hope this helps
Another way of looking at this is that type 1 and type 2 LSAs are
trees. The branches of the type 1 are networks. It's not that the
advertising router of the type 1 changes, it's the variable length
leaf information.
>On 10 Jan 2001 01:08:17 -0500, [EMAIL PROTECTED] (scott) wrote:
>
>>Dear OSPF gurus:
>>
>>I am probably missing a very basic point here as I am somewhat new to
>>OSPF. I have been debugging ospf adjacency, ospf events, ospf flood
>>plus some others. After routers become adjacent, the flooding process
>>starts. What I have noticed is that right after routers become
>>adjacent, they create a new router LSA and add one to the sequence
>>number. (The DR also sends out a network LSA.)
>>
>>My question is this: Does each router create this new instance of the
>>LSA to trigger the flooding process itself or is there some other reason
>>why a "new" LSA is created? *Why not just send out the original LSA to
>>begin the flooding process?* Doesn't sending out a new LSA cause
>>routers to recalculate their routing tables when, in fact, they just
>>calculated them moments ago when they became adjacent using the original
>>LSA?
>>
>>I understand the need for the flooding process. I don't understand the
>>need for a new LSA.
>>
>>Thanks in advance,
>>
>>Scott Chapin
>>
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