nothing bad will happen unless you have overlapping subnets. idle curiousity - in a situation like this, why OSPF as opposed to EIGRP or RIPv2 or ODR, for that matter?
""bergenpeak"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > Ran across some text in Doyle's V1 that confirms JMcL's comment > below (page 462, Partioned Areas section). > > So, the next question for the group is the following: > > OSPF doesn't track the area information once the routing information > gets injected into the backbone. Suppose you have a network with N > different physical locations and each will be configured as sub-area. > Each sub-area connects to the backbone via it's own ABR. > > Is there any reason to use different area numbers in this situation? > > From an Ops perspective (say where you have tools to go out and touch > the configs on the ABR and sub-area routers), using the same area number > will simplify the configs and tool logic. > > So, is there some benefit to actually use different sub-area IDs? > > Thanks > > > > > > > bergenpeak wrote: > > > > > > Suppose I have two ABRs that are supporting the same sub-area. > > > The ABRs are not directly connected, but can reach each other > > > through links inside the sub-area. > > > > > > Suppose a link fails causing the two ABRs to not have > > > connectivity > > > through the sub-area. The sub-area is therefore partitioned. > > > > > > Suppose the ABRs are not doing route summarization. > > > > > > Will this cause a problem from the backbone perspective? > > > > > > Will this cause a problem for traffic which needs to flow from > > > one side of the sub-area to the other part of the sub-area? > > > > > > Thanks > > > > > > > > > > I don't believe it will cause any problems. I'm not going to look it up > > right now, but I'm sure I've researched this one before. As long as there > > is no summarisation (or no overlapping summarisation), the two partitions > > are simply treated as two sub-areas. > > > > JMcL Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=51209&t=51209 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
