Hi Chuck,
I agree with all that you've said, but I feel that a virtual link is the
only solution and since virtual links are on-demand circuits, it would only
be active if and when it's needed. I feel that a consistant methodology is
more desirable than having to remember when you must do something and when
it's optional.
my 1.532 cents worth
Rodgers Moore
""Chuck Larrieu"" <[EMAIL PROTECTED]> wrote in message
002801c026a3$bcf3e880$[EMAIL PROTECTED]">news:002801c026a3$bcf3e880$[EMAIL PROTECTED]...
> A segmented area is of no concern so long as there is no overlap of
address
> space. In your case, it would appear that there might be such an overlap.
A
> temporary repair can be made using a virtual link.
>
> ( an interesting aside - the OSPF RFC makes short mention of segmented
> areas. There is nothing in the RFC prohibiting duplication of area
numbers.
> I have done a small lab using duplicate area numbers with no problem. All
> routes passed. I posted the results here a month or so back, if memory
> serves. )
>
> In terms of points of failure, the question is how much redundancy do you
> want and need, given your business operation? The world is a single point
of
> failure, said one person whom I respect. If your business is such that 1)
> you require 100% availability and 2) you have the money to pay for it,
then
> yes your design should include not only full meshing, but multiple
redundant
> routers ( HSRP ) as well as cold spares on premise at all locations. You
> should also have Smart Net 7x24 by 4 hour, and locate your critical
> operations only within a couple of hours drive of Cisco distribution
points
> ( usually near major airports. )
>
> Food for thought.
>
> Chuck
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
> Andre Riscalla
> Sent: Sunday, September 24, 2000 7:35 PM
> To: [EMAIL PROTECTED]
> Subject: Dual Homing to OSPF Area 0
>
>
> Hi All,
>
> I ran into an interesting OSPF problem:
>
> I have multiple distribution routers (D1, D2) in OSPF area 10, dual homed
> to ABR's C1 and C2. C1 and C2 have a link between them, in area 0. I am
> doing summarization into area 0. The picture below summarizes this
> situation:
>
> /----\ Area_0
> C1 C2-------------^
> | \ /| |
> | \/ | v Area_10
> | / \ |
> | / \|
> D1 D2
>
>
> What happens if the links between D1 & C2 and D2 & C1 fail at the same
> time? Communication between D1 & D2 now has to occur through C1 & C2 over
> area 0, which means I have segmented area 10.
>
> How is this design normally done, dual homing the "D" routers to multiple
> "C" routers. If the "C" routers are only ABRs for one area, does it make
> sense to have the link between C1 & C2 in area 10 as well?
>
> Any feedback is greatly appreciated.
>
> Thanks.
>
> AR-
>
>
> --
> Contrary to popular belief, Unix IS user friendly. It just happens
> to be very selective about who it decides to make friends with.
>
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
> Andre Riscalla Network Specialist - Internet
> [EMAIL PROTECTED] 514-940-5664
> Network Engineering AT&T Canada
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
>
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