From: Scott Morris (smorris@internetworkexpert.com)
Date: Mon Oct 13 2008 - 11:18:26 ART
Correct. You are setting your links cost (thus the router advertisements)
to the maximum value which basically says "I'm here, but don't use me!"
-----Original Message-----
From: Reza Toghraee [mailto:reza@toghraee.com]
Sent: Monday, October 13, 2008 8:01 AM
To: 'Scott Morris'
Cc: ccielab@groupstudy.com
Subject: RE: OSPF Question, how to prefer inter area routes, over intra area
Yes I manipulated, and changed the cost of other links to a higher value.
But I didn't check the "sh ip ospf virt". Now I understand why it doesn't go
on virtual link by default. BECAUSE the COST of VIRTUAL-LINKS is
significantly higher.
1 more question : What does "ip ospf cost 65535" mean? Does it mean that NO
TRAFFIC will pass the link even if this is the only operational link?
Regards
Reza
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Scott Morris
Sent: Monday, October 13, 2008 3:52 PM
To: 'Reza Toghraee'
Cc: ccielab@groupstudy.com
Subject: RE: OSPF Question, how to prefer inter area routes, over intra area
Once you have your virtual link, you'll notice that the cost to the routes
is significantly higher though. Have you tried manipulation in this sense?
(sh ip ospf virtual-link)
-----Original Message-----
From: Reza Toghraee [mailto:reza@toghraee.com]
Sent: Monday, October 13, 2008 6:40 AM
To: smorris@internetworkexpert.com
Cc: ccielab@groupstudy.com
Subject: RE: OSPF Question, how to prefer inter area routes, over intra area
It's a Lab scenario, I crated myself of course its amazing ;)
I found this Method, and its working
1) R3 peers with R2 over a virtual link on Area23
2) R1 peers with R3 over a virtual link on Area13
3) R1 puts ospf cost 100 on its 64K link to R2.
So R1 receives R2' Loopback interface over its 64K link and also from
Virtual link from R3. Both as intra-area.
By default it should prefer the virtual link, and if not we can use ip ospf
cost to change metrics.
-----Original Message-----
You'll ALWAYS get intra-area over inter-area. That's the way the spec is
written, and it just plain makes sense. :)
Was it intentional to make the slowest path the "backbone" of your OSPF
network?
Scott
-----Original Message-----
174.1.13.0/24
_____ __________________________ _____
| R1| | | | R2|
|___|---| A R E A 0 |--------|___|
| | This link is a 64K | |
| |__________________________| |
| ____|______
__|__________ | |
| | | |
| AREA13 | _______| |
| | 174.1.31.1 V13 | |
| 10Mbps | | |
|____________| | A R E A 23 |
| | |
__|__ |_________________| 10Mbps BW |
| R3| | |
|___|-------|___________________________________|
174.1.43.4 /24 V 43
R2 is advertising it Looback in OSPF AREA 0 ,with network command.
R1 will route through the AREA 0, on 64K Link to reach R2' Loopback 0.
Question 1 : how to make R1, route through R3 on Area 13, and Area 23 to
reach R2' Loopback ?
What I tried :
1) I tried to use distance on the routes coming from R2, to change them to
130, but seems the OSPF first chooses the InterArea route over intra area,
then applies the distance.
2) I used a distribution-list on R1 to filter the routes coming from R2. Its
working but if the Link between R1,R3 is disconnected, then R1 cannot reach
R2' Loopback
Question 2: R2 Advertises its Loopback with Redistribution as E1.
What I tried :
1) I tried to change the costs on 64K Link to very high. But I don't
remember it worked or not.
Waiting for your solutions.
Reza Toghraee
Blogs and organic groups at http://www.ccie.net
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