Bob,
A stub area may have more than one ABR. Stub areas are areas into which
information on external routes is not sent. Instead, there is a default
external route generated by the area border router, into the stub area for
destinations outside the autonomous system. To take advantage of the OSPF
stub area support, default routing must be used in the stub area.An area
could be qualified a stub when there is a single exit point from that area
or if routing to outside of the area does not have to take an optimal path.
The latter description is just an indication that a stub area that has
multiple exit points, will have one or more area border routers injecting a
default into that area. Routing to the outside world could take a
sub-optimal path in reaching the destination by going out of the area via an
exit point which is farther to the destination than other exit points
Hope this helps. I derived this information partly from Doyle's book on
TCP/IP Routing and the CCO.
Sincerely, Raul
----- Original Message -----
From: "Bob Hunter" <bobjhunter@^nospam^yahoo.com>
Newsgroups: groupstudy.cisco
To: <[EMAIL PROTECTED]>
Sent: Friday, August 11, 2000 4:29 PM
Subject: OSPF Totally Stubby Areas and area default-cost
> Hi,
> I'm confused on the subject of totally stubby areas, and the command
"area
> default-cost". From what I'm reading, one of the qualifications of a
totally
> stubby area is that if multiple exits (ABRs) exist, routing to outside the
> area does not have to take an optimal path. Does this mean that each
router
> within the area picks the closest ABR as the gateway to everything outside
> the area, and that there is no way to control the default route? If so,
does
> that imply that the area default-cost is used for incoming routes? Would
> incoming routes even exits if the area was a totally stubby area?
>
> I would very much appreciate it if someone would please set me straight.
>
> Thank you.
>
> Bob Hunter, CCNA, CNE
>
>
>
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