From: niallr@xxxxxxxxxxxxx
Date: Thu Mar 30 2000 - 14:32:33 GMT-3
You can set the reference bandwidth so that a gig link is 1 and 100Mb is 10 etc
.
I think the command is ospf auto-cost reference-bandwidth N where N= the
highest-speed link in the network, such as the gig link. Check the exact syntax
on a router near you. The command is issued under the routing protocol config
mode.
ejobson wrote:
> I wonder if someone could help me out with this:
>
> I understand that the costs are calculated for OSPF by 100,000,000/bandwidth
> which gives a standard ethernet connection a value of 10. A fast ethernet or
> FDDI would be 1, so I guess a Gigabit link would also be 1. What attribute
> would be used by default to ensure traffic took the 1000Mbps over the
> 100Mbps one, or is it just a limitation due to OSPF now being a bit dated? I
> have heard a solution for this in the past but have since forgotten it.
>
> Is it a case of manually setting the cost of all fast ethernet interfaces in
> the network to say 5, as it doesn't seem possible to have a value higher
> than 1.
>
> Also is there any chance of Gigabit being used to confuse OSPF calculations
> in the exam?
>
> Thanks.
>
> Eddie Jobson
> Internetwork Solutions Engineer
> Nevolutions UK Ltd. a division of
> Total Network Solutions Inc.
> 7th Floor, Tower 42
> The International Finance Centre
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>
> Office +44 (0)171 877 1992
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>
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>
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