From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Sat Jan 15 2005 - 11:28:16 GMT-3
The order of preference regardless of cost is:
Intra-area over Inter-area
Inter-area over External Type-1
External Type-1 over External Type-2
The only time that this order of preference is not taken into
consideration is when the router is comparing OSPF routes from different
OSPF processes.
For information regarding OSPF route selection, you can look over RFC
2328 OSPF Version 2 - Section 16 (Calculation of the routing table)
http://www.internetworkexpert.com/rfc/rfc2328.txt
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
ccie2be
Sent: Saturday, January 15, 2005 3:13 AM
To: Group Study
Subject: ospf path selection: Internal vs External
Hi guys,
I hope this isn't a completely dumb question, but...
If an ospf router has a choice between 2 paths to a subnet where 1 path
is
via
an External route and the other path is via an ospf internal (inter-area
or
intra-area)
route, is that taken into consideration in determining which path is
installed in the
route table?
If that is considered, does ospf automatically prefer one route over the
other
or does the spf
calculation ignore that?
( For this to occur, I realize that an ospf route has to be
redistributed out
of ospf and then back in,
but in the scenario I'm working on, that's just what I want to do and I
want
ospf to choose the external route
over the internal route.)
Thanks in advance, Tim
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