Look into policy routing. Also, don't forget OSPF
prefers intra-area routes.
Example:
r3
/ \
r1---r2
r1 to r2 is area 0 - Fast Ether
r1 to r3 is area 1 - 128k line
r2 to r3 is area 1 - T1 line
Traffic will go from r1 to r3 instead of r1 to r2 then
r3. To get it to go from r1 to r2 to r3 you need to
put the routers all in the same area or put the r1-r3
link in it's own area.
--- Low How Ming <[EMAIL PROTECTED]> wrote:
> Hi all,
>
> Need to find out if there is a method for avoiding
> asymmetric routing
> between 2 areas both with 2 ABRs and equal capacity
> links (E1 - 2.048Mbps).
>
> I'm looking to influence flow of traffic to certain
> destinations to remain
> on a single link, and not have traffic to lets say
> 10.32.0.0/12 go out on
> link A (ABR A) and return on link B (ABR B).
>
> If I have a range of addresses 10.0.0.0/12, I know I
> can split it between
> ABR A (10.0.0.0/13) and ABR B (10.8.0.0/13) - using
> area summary statements.
> But the difficulty is actually configuring the other
> ABR as a backup for the
> same routes. I.e. ABR A backs up ABR B's range
> 10.8.0.0/13 and vice versa.
>
> Is the above possible?
>
> regards,
> Ming.
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