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RE: Routing preferences question

  • From: Senkow, John - CIPS
  • Date: Thu Jan 30 10:29:04 2003

Depending on the scale of what you are trying to accomplish, you can also
change the prefix length of the route.  If you have a local static route
that is a /20, you can route two /21's in OSPF.  Most of the suggestions I
have seen are options, but other mechanisms should be used because the
scalability of these solutions are very limited.

John Senkow



-----Original Message-----
From: Timothy R. McKee [mailto:tim@baseworx.net]
Sent: Thursday, January 30, 2003 9:00 AM
To: nanog@merit.edu
Subject: RE: Routing preferences question



You have to change the admin distances.  Unfortunately for you, I don't
think there is a way to change the admin distance for a connected interface
which has a default of zero.  Anyone know of a selective way to do that?

OSPF is 110 by default, statics are 1 by default, but you can set their
distance on a per route basis, 'ip route x.x.x.x y.y.y.y v.v.v.v distance'.

What exactly are you trying to do?  There may be other mechanisms to
accomplish what you want.

Tim McKee

-----Original Message-----
From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu]On Behalf Of
william@elan.net
Sent: Thursday, January 30, 2003 2:38
To: nanog@merit.edu
Subject: Routing preferences question



   Hi,

Does anybody know how/if I can force cisco router to consider ospf route
(I'll consider other igp protocol if its possible) from particular source
to be prefereble over connected and locally-entered static routes. This is
needed for failover project I'm doing. Please note that especially big
question is with "connected" route through subinterface, which I can't
find any way to override with igp, for static I could at least make them
learned igp routes.

I'd apprecitate to know how somebody has done something this or at least
find for sure that its impossible. If it matters, I'm trying to do it
on 7500 running 12.0 ios and interfaces are ethernet isl vlans.

---
William Leibzon
Elan Communications
william@elan.net




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