From: Brad McConnell (bmcconne@rackspace.com)
Date: Mon Jan 29 2007 - 11:26:53 ART
You basically have it. Since any route with an E prefix is external, you
know it was redistributed in. At the point of redistribution, if you do
"redistribute foo subnets metric-type 1" it will be an E1 route instead of
an E2 route throughout the OSPF domain.
Why would you use this? Well, it depends on how you want traffic to exit
the OSPF domain. If you use E1 and redistribute from two different ASBRs,
the net effect is that your traffic uses the closest exit point from the
local OSPF domain. If you use E2, you're in more of a traffic engineering
scenario. Want to load balance? Redistribute in with the same metric from
two points. Want to manually prefer one exit point over another?
Redistribute in with a manually defined cost lower on one ASBR than on the
other.
Hope that helps,
Brad McConnell
CCIE# 16147
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Edouard Zorrilla
Sent: Monday, January 29, 2007 6:49 AM
To: ccielab@groupstudy.com
Cc: security@groupstudy.com
Subject: OSPF External Types
Hello There,
I would like to know the difference between E1 and E2 (default) external
types
? For instance I know that OE1 add the internal cost of each link it crosses
and OE2 does not. Let me know if there is something beyond this.
Also, how can I change the default behaviour, I mean what can I do so that I
see in my routing table a E1 instead a E2 ? Any exaple would be appreciate.
Regards
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