At 1:18 AM +0000 1/25/03, Priscilla Oppenheimer wrote: >I'm afraid your question isn't clear. > >By definition, an ASBR connects two unlike networks, one that is running >OSPF and one that isn't.
Moan...connects two unlike routing domain. Both could be different OSPF processes. >So, the ASBR will connect to the Internet in your >example. > >Steve Ringley wrote: >> >> I have an OSPF network, and I have my Internet connections. Do >> I: >> >> ASBR where traffic goes from area 0 to the Internet > >Is that where your Internet connection is? In area 0? Often, it is, and >that's where your ASBR will be. > >> >> or >> >> ASBR where traffic goes to an area x then to the Internet? > >Goes from where to an Area x and then to the Internet?? This is where your >question gets unclear. But if you are considering putting an ASBR between >Area x and Area 0, then that doesn't make sense. It's not an ASBR because >it's connecting two OSPF networks. If your Internet connection is in Area X, >you will have an ASBR that connects the OSPF world to the Internet, sitting >on the edge of Area X. Of course, a single router can simultaneously be an ASBR and ABR. > >Are you asking if the ASBR should be in Area 0? I think the answer is yes, >if it can, but sometimes that's simply not possible on large internetworks >with multiple egress points. > >If I completely missed what you're getting at, sorry! > >Priscilla Again, the answer is "it depends." Especially when I'm doing a migration from an older protocol to OSPF, or redistributing statics, I will often have an ASBR at the "far edge" of a non-backbone area. One interesting topology was for a Very Large Communications Company with a Well-Known Research Lab. Said lab had its own Internet connectivity (OC-3, IIRC), where corporate had DS-3. The lab wanted to hear summarized corporate routes from area 0.0.0.0, but did NOT want to hear default from the core, and did not want its area default to propagate outside the ara. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=61857&t=61823 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
