Re: OSPF costs

From: Ryan B (rbenigno@xxxxxxxx)
Date: Thu Mar 30 2000 - 14:22:04 GMT-3


   
You can change the reference bandwidth used by OSPF for the calculation. So
if you want your gigabit connections to be a cost of 1 with your
fastethernet/fddi being 10, you would just use "ospf auto-cost
reference-bandwidth 1000"... It's "auto-cost reference-bandwidth" on some
platforms. This needs to be done on all routers in a given area.

-Ryan

----- Original Message -----
From: ejobson <ejobson@tns-inc.com>
To: <ccielab@groupstudy.com>
Sent: Thursday, March 30, 2000 8:25 AM
Subject: OSPF costs

> 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
> 25 Old Broad Street
> London
> EC2N 1HN
>
> Office +44 (0)171 877 1992
> Fax +44 (0)171 877 1059
> Mobile +44 (0)7867 505635
> Email ejobson@tns-inc.com
>
> Website http://www.tns-inc.com
>
>



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