From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Wed Apr 16 2008 - 23:02:03 ART
http://blog.internetworkexpert.com/2008/04/16/ospf-virtual-links-and-max-cost/
Brian Dennis, CCIE4 #2210 (R&S/ISP-Dial/Security/SP)
bdennis@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
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>----- Original Message -----
Subject: Virtual Links and max ciost
Date: Wed, April 16, 2008 12:25
From: "Mike Harrison" <michael.h4@blueyonder.co.uk>
> Hi
>
> I have found a small issue with virtual links. If the the cost of the link
> is 65535 (max ospf can use) then the virtual link wont come up;
>
> OSPF_VL0 is down, line protocol is down
> Internet Address 0.0.0.0/0, Area 0
> Process ID 1, Router ID 150.11.4.4, Network Type VIRTUAL_LINK, Cost:
65535
> FastEthernet0/0 is up, line protocol is up
> Internet Address 129.11.45.4/24, Area 1
> Process ID 1, Router ID 150.11.4.4, Network Type BROADCAST, Cost: 65535
>
> But if you reduce it by 1 then it comes up;
>
> OSPF_VL0 is up, line protocol is up
> Internet Address 129.11.45.4/24, Area 0
> Process ID 1, Router ID 150.11.4.4, Network Type VIRTUAL_LINK, Cost:
65534
> FastEthernet0/0 is up, line protocol is up
> Internet Address 129.11.45.4/24, Area 1
> Process ID 1, Router ID 150.11.4.4, Network Type BROADCAST, Cost: 65534
>
> When it is maxed the ospf neighbor comes up and routes are valid, just
> virtual links wont come up. I realise that this isnt going to happen in
real
> life unless you crank up the auto-cost ref bw and have a 64k interface -
> just curious if anyone has an explaintion.
>
> Mike
>
>
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