At 11:21 PM +0000 1/8/03, Helena wrote:
>Hi,
>
>Are you allowed to have more than one ABR for a particular area? For
>example, 2 routers that are both ABR for Area 2?
Yes. In fact, you could have (trust me that there's a link between
the parts of area 3 serviced by R1 and R4 --it would be too painful
to draw this in ASCII
R1 R2 R3 R4
area 3 + area 1 area 1 + area 2 area 2 + area 3 area 3 + area 1
Cisco's conservative rule is not more than 3 areas per ABR, although
I've never found a reference that made it clear whether they are
counting area 0.0.0.0 in that. I've certainly had carefully chosen
situations where I had an ABR servicing seven nonzero areas, with
extensive summarization and very stable physical plants.
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=60667&t=60654
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