From: Richard Dumoulin (richard.dumoulin@vanco.es)
Date: Sun Jun 06 2004 - 22:35:36 GMT-3
I forgot to mention that B's loopback is in area 0 !!
-----Original Message-----
From: Richard Dumoulin
Sent: lunes, 07 de junio de 2004 3:28
To: John Underhill; David Sanchez; ccielab@groupstudy.com
Subject: RE: OSPF internal vs External
Actually it was a scenario where I needed to prefer an interarea route vs an
intraarea one.
Suppose you have 2 routers, A and B connected via frame-relay and isdn.
Dialer watch is configured. A will dial B if it loses B's loopback.
Now the frame-relay link is in area 1 and the isdn in area 0. When the
frame-relay goes down, dialer watch triggers a call and A learns B's
loopback. When the frame-relay comes back, A never installs the interarea
B's loopback address because it still prefers it through the isdn. A
consequence is that the isdn stays up indefinitely. I know it's a bad design
but it is only an exercise :)
--Richard
-----Original Message-----
From: John Underhill [mailto:stepnwlf@magma.ca]
Sent: lunes, 07 de junio de 2004 2:26
To: Richard Dumoulin; David Sanchez; ccielab@groupstudy.com
Subject: Re: OSPF internal vs External
I am trying to envision the circumstance where this would be plausible, or
desirable.. the destination network is either within the ospf domain or it
is an external route.. but how could it be both? But I suppose you could
manipulate the metric with an inbound distribute list calling a route map,
then in the route map filter on route source | interface | or route type,
and use the set metric command to apply the new metric.. or for that matter
filter the undesirable route completely using a similar method. Never tested
it, but it's worth a look.
router ospf 199
distribute-list route-map MYFILTER in
!
route-map MYFILTER permit 10
match route-type external
set metric 80
Here's a good link..
http://www.cisco.com/en/US/products/sw/iosswrel/ps1829/products_feature_guid
e09186a008012db77.html
----- Original Message -----
From: "Richard Dumoulin" <richard.dumoulin@vanco.es>
To: "David Sanchez" <david.sanchez@starmedia.com>; <ccielab@groupstudy.com>
Sent: Sunday, June 06, 2004 8:01 PM
Subject: RE: OSPF internal vs External
> In a scenario I did some time ago, I only wanted to prefer one
> external route not all. I tried the distance command with an acl but
> in vane. It's true that I did not think about this one. I'll try it
> when I have time,
>
> Thanks,
>
> --Richard
>
> -----Original Message-----
> From: David Sanchez [mailto:david.sanchez@starmedia.com]
> Sent: lunes, 07 de junio de 2004 2:57
> To: ccielab@groupstudy.com; Richard Dumoulin
> Subject: RE:OSPF internal vs External
>
>
> You can use the command "distance ospf external 100" to change the
> administrative distance for only external routes and make them
> prefered
over
> internal
>
> Regards
>
> Is there a way for a router to prefer an external ospf route over an
> Inter area one ? I remember having tried once with the distance
> command but in vane :( Maybe by manipulating the metrics of the
> redistributed routes ?
>
> --Richard
>
> ______________________________________________________________________
> _
> Please help support GroupStudy by purchasing your study materials
> from: http://shop.groupstudy.com
>
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
> http://www.latinmail.com - La forma mas csmoda de enviar y recibir tus
> e-mails
>
> ______________________________________________________________________
> _
> Please help support GroupStudy by purchasing your study materials
> from: http://shop.groupstudy.com
>
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Sat Jul 03 2004 - 19:40:34 GMT-3