Comments inserted below.
>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.
As per the various OSPF rfc's (2328 for ospfv2), the bdr will wait out the
RouterDeadInterval before assuming the role of DR. Generally, this period is set to 4
times the hello interval (in Cisco and Juniper from what I recall) which is usually 10
seconds. Hence, 40 seconds would be the delay in this case.
>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.
Your findings are correct. A DR/BDR is only elected in Broadcast or NBMA networks
It should be noted that DR's and BDRs simply represent multiaccess segments with
summary LSA's (type 2). These summaries are very much like type 1 lsa's which all
routers can and will generate. Overall the convergence process is handled by the
flooding of appropriate LSAs.
>
>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?
>
Cisco does support the running of multiple, exclusive ospf processes on one router.
The process ID is a locally significant value that separates these processes within
the router. Very few situations justify the use of multiple processes. The only few
I've seen all entailed migrations where this setup was a intermediary stage.
Hope this helps.
Pete
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