From: Gary Duncanson (garyduncanson@btinternet.com)
Date: Mon Oct 13 2008 - 16:01:47 ART
That's interesting. I figured 65535 as the highest would actually work if
that's all you have going for you. I haven't tested this myself just logic
here.
Is it like admin distance 255 then in some sense i.e unbelievable or just
don't use?
----- Original Message -----
From: "Scott Morris" <smorris@internetworkexpert.com>
To: "'Reza Toghraee'" <reza@toghraee.com>
Cc: <ccielab@groupstudy.com>
Sent: Monday, October 13, 2008 3:18 PM
Subject: RE: OSPF Question, how to prefer inter area routes, over intra area
> 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
>
>
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