From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Fri Apr 14 2006 - 13:02:22 GMT-3
Yes that would just create another intra-area route. You could
filter out the intra-area route with a distribute-list to stop it from
being installed in the routing table. It depends on the specific
topology though.
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Eugene Ward
> Sent: Friday, April 14, 2006 10:33 AM
> To: Fire_Ice@verizon.net
> Cc: Brian Dennis; apilcher@itgcs.com; Fire_Ice@verizon.net;
> fzabihi@cisco.com; ccie.jimmy@gmail.com; ccielab@groupstudy.com
> Subject: RE: OSPF route preferencing
>
> ZeroFlash,
>
> With your answer, aren't you just creating another intra-area route,
> thereby not really changing the decision process?
>
> Eugene
>
> ----------------------------------------------------------------------
>
> Brian --
>
> PBR does not answer the question as you stated, but creating a tunnel
via
> tunnel interfaces or virtual-links can change the route decision
process
> inside the OSPF process, correct?
>
> Depending on the area that the tunnel interfaces are..
>
> ZeroFlash
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Brian Dennis
> Sent: Friday, April 14, 2006 10:39 AM
> To: Aaron Pilcher; ZeroFlash; Faryar Zabihi (fzabihi); James Simons;
Cisco
> certification
> Subject: RE: OSPF route preferencing
>
> Of course you can use all kinds of methods to have the "routing
> table"
> prefer one route over another but that wasn't the question. The
> question was basically asking if inter-area routes can be preferred to
> intra-area routes. With PBR you are overriding the routing table but
> not changing the route selection process within OSPF itself. The
> problem I have with your answer is that people will now assume that
they
> can get PBR to have OSPF select inter-area routes over intra-area
routes
> which isn't true.
>
> Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
> bdennis@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987
> Direct: 775-745-6404 (Outside the US and Canada)
>
>
> -----Original Message-----
> From: Aaron Pilcher [mailto:apilcher@itgcs.com]
> Sent: Friday, April 14, 2006 4:54 AM
> To: Brian Dennis; 'ZeroFlash'; 'Faryar Zabihi (fzabihi)'; 'James
> Simons'; 'Cisco certification'
> Subject: RE: OSPF route preferencing
>
>
>
> I 110% agree, but you could force a single ospf router to route over
an
> inter-area route when the ospf process would naturally select an
> intra-area
> route. I mean, making "unnatural" stuff happen is what PBR is all
> about.
>
>
>
>
> -----Original Message-----
> From: Brian Dennis [mailto:bdennis@internetworkexpert.com]
> Sent: Thursday, April 13, 2006 11:37 PM
> To: Aaron Pilcher; ZeroFlash; Faryar Zabihi (fzabihi); James Simons;
> Cisco
> certification
> Subject: RE: OSPF route preferencing
>
> To have inter-area routes preferred over intra-area routes, policy
based
> routing (PBR) will not work. PBR can not alter the route selection
> process within OSPF itself. So this means that if the requirement is
to
> prefer inter-area over intra-area OSPF routes, PBR will not meet the
> requirement.
>
> HTH,
>
> Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
> bdennis@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987
> Direct: 775-745-6404 (Outside the US and Canada)
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Aaron Pilcher
> Sent: Thursday, April 13, 2006 7:45 PM
> To: 'ZeroFlash'; 'Faryar Zabihi (fzabihi)'; 'James Simons'; 'Cisco
> certification'
> Subject: RE: OSPF route preferencing
>
> To add to your points, PBR would also fit the bill.
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> ZeroFlash
> Sent: Thursday, April 13, 2006 9:27 PM
> To: 'Faryar Zabihi (fzabihi)'; James Simons; Cisco certification
> Subject: RE: OSPF route preferencing
>
> Creating a tunnel would certainly help in learning routes from one
area
> to
> another to influence route selection based on inter/intra area routes.
> The
> only with this is to be careful not to learn your tunnel routes
through
> the
> tunnel or you'll get recursive routing and the tunnels will bounce.
>
> I would also think about another type of tunnel, perhaps a
virtual-link
> here
> might help.
>
> Just some thoughts off the top o the head.
>
> Later...
>
> ZeroFlash
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Faryar Zabihi (fzabihi)
> Sent: Thursday, April 13, 2006 10:20 PM
> To: James Simons; Cisco certification
> Subject: RE: OSPF route preferencing
>
> 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.
>
> thanks,
>
> Jimmy
>
>
>
This archive was generated by hypermail 2.1.4 : Mon May 01 2006 - 11:41:57 GMT-3