From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Fri Apr 14 2006 - 10:08:32 GMT-3
At 10:20 PM -0400 4/13/06, Faryar Zabihi \(fzabihi\) wrote:
>As you might well know...AD will not work here. You might be able to
>accomplish this through having another OSPF process but haven't tried.
>You can also change routing protocol for those routes(but you probably
>don't want that) Also if you want to get yourself into a mess read
>this(I have and never implemented)
>http://mirrors.isc.org/pub/www.watersprings.org/pub/id/draft-mirtorabi-o
>spf-tunnel-adjacency-00.txt
>I suggest you take a step back and see what the requirement really wants
>you to do.
>
> Faryar Zabihi
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>James Simons
>Sent: Thursday, April 13, 2006 6:51 PM
>To: Cisco certification
>Subject: OSPF route preferencing
>
>Hello all,
>
>Another OSPF question for you all. OSPF always prefers intra-area
>routes over inter-area routes, regardless of the route cost right? Is
>there anyway to get a router to prefer an inter-area route? If there
>are multiple methods, I would like to know as many of them as possible
>since you never know what you will be allowed to do in the lab.
In the real world, it's not uncommon to want to have
traffic-engineered or backup exception cases to the route selection
of OSPF. Sometimes, the policy-preferred route is inter-area from the
perspective of the OSPF topology.
The usual way I solve that is with static routes, which MUST NOT be
redistributed into OSPF. See my Montreal NANOG presentation on "Good
things you do with OSPF," an updated version of which will be on the
Layer3Arts website One of These Days (no, not in the next couple of
weeks. I'm trying to get out a proposal for a fault
tolerance/disaster recovery tutorial before the Monday deadline, when
I will be moving to St. Louis anyway)
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