Scott,
I'm currently working on OSPF myself and believe
your question has already been answered in an earlier
post.
I have found using a Sniffer very helpful, used
in combination with the debug commands you mention.
If you add 'debug ip ospf packet' you can start to
match the sniffer trace directly with the debug trace.
So you can see the stateful world of the Router versus
the network frames that have been generated.
Word of warning though, and something I have been
suspicious of for some time. You cannot take the word
of Debug to absolutely i.e as a software tool it is
seen by very few people compared to an Analyser and as
such I believe contains proportionately more bugs.
It also can get a trace out of sequence with what
really is happening on the wire, however, if you look
out for sequence numbers and checksums you can get it
back in step.
Regards,
Phil.
--- scott <[EMAIL PROTECTED]> 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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