From: Reinhold Fischer (Reinhold.Fischer@gmx.net)
Date: Sun Apr 23 2006 - 06:58:56 GMT-3
Hi Victor,
this is really an interesting question that i never thought about.
The following is just my understanding and i could be wrong:
The virtual link is not like a tunnel where packets are forwarded through.
It is just a definition, that (simplified) says that two not directly
connected routers should exchange ospf information by means of ip unicast
packets. That packets follow a certain way through the transit area
according to the ospf metrics of the links in that transit area. The
metric that you see on the virtual link and that is visible to the
backbone area is the metric of this best way through the transit area.
The separate link metrics and details of the transit area are not known
to the backbone area.
I think there is no reason to be able to change the cost of the VL directly.
The VL is just a simplified representation of the cost to go through the
transit area used by the SPF calculation of the backbone area.
Anyone with a better explanation? I've read rfc2328 and Routing TCPIP
Vol1 but found no good explanation. Eventually the John Moy OSPF book
has a better information, but i do not have this book...
regards
reinhold
On Sat, Apr 22, 2006 at 04:52:15PM -0400, Victor Cappuccio wrote:
> Hello All,
>
> Does anyone know how to modify the OSPF Virtual Link Cost?
> I been searching in cisco/google/router but with no luck (seems to me
> logic to modify a Cost to a Virtual Link), and yes we can lower the cost
> of other interfaces, but why not with the VL?
>
> Thanks
> Victor.
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