This has been an awesome thread to me. Thanks everyone for the input.
Evidently I'm not alone in being confused over BDR to DR promotion. The
books and literature I've found have clearly stated that the event to
promote BDR's to DR's is a missed LSA; however, the tests here show
otherwise. Winston, I'm with you: I hope they never ask this on the test.
I'll have to decide between what I believe to be right and what the book
states as right.
I still think there's a piece missing. 40 seconds to take over the functions
of DR seems like it could create routing delays or time outs on a large
network. I'm going to continue to look for a definitive answer.
Thanks Again,
David
""David Armstrong"" <[EMAIL PROTECTED]> wrote in message
8uh8vj$c47$[EMAIL PROTECTED]">news:8uh8vj$c47$[EMAIL PROTECTED]...
> Last night at our BSCN study group meeting in Dallas we had some questions
> about OSPF that we weren't able to resolve. If someone or ones could
answer
> these it would clarify some areas we're a little fuzzy on. Also, if you're
> iin the Dallas Ft. Worth area and would like to attend, we'd love to have
> you join us..
>
> Thanks for any help,
>
> David Armstrong
>
>
> 1) What is the default time period that the BDR waits when listening to
> LSA's from the DR before it decides that the DR is down and promotes
itself
> to DR. All the literature we could find simply said that the BDR waits for
> the specified time period but never said what that period is.
>
> 2) In a Point-to-Point network in which the router in Area 0 is connected
to
> FR, ISDN, X.25 or ATM branch offices (networks), how does convergence and
> updates take place? From what we've found a DR and BDR is not elected in a
> strictly Point-to-Point network.
>
> I think an example would explain this question better: We have one 3620
> router in our Ft. Worth office connected to an office in Houston (via FR),
> and office in Kansas City (via FR), an office in the DFW area (via ISDN)
and
> the owner's home (via ISDN). The 3620 is behind a firewall (Pix 520) and
the
> firewall is connected to a 1720 going to the Internet. I'd like to
implement
> OSPF on our network simply for the experience. However, I don't have 2
> routers internally on our Ethernet LAN that can be configured for Area 0
and
> elected to DR and BDR. All other routers connected to that router are via
> NBMA Point-to-Point connections. Since I only have one router on the
> Broadcast Multiaccess network (the 3620) and routers connected via PtoP
> don't participate in DR and BDR elections, how would updates occur? Can
> their only be one DR (in this case the 3620)?
>
> 3) The books and tutorials all state that "router ospf 6" defines ospf on
> the router with a process ID of 6. They then all say that you shouldn't
> define more than one process. Does that mean that you can have a router
with
> the following:
>
> router ospf 6
> network 10.100.0.0 0.0.255.255
>
> router ospf 7
> network 10.200.0.0 0.0.255.255
>
> If this is an allowed configuration, what kind of instances would it be
used
> for? Also, exactly what is the process ID used for?
>
>
>
>
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