From: Dotun Oni (dot_oni@hotmail.com)
Date: Thu Nov 21 2002 - 15:22:22 GMT-3
I believe they want the bandwidth to match whatever clockrate you set on the
interface.
I'll rather stick with the pre-configured clockrate of 64000 rather than
change it to 2000000 just to play it safe.
D
>From: "Daniel Garrity" <ccie@garrityfamily.com>
>To: "Richard Chung" <richung@cisco.com>,"Dotun Oni"
><dot_oni@hotmail.com>,<ccielab@groupstudy.com>
>Subject: RE: Bootcamp lab2; OSPF cost
>Date: Thu, 21 Nov 2002 10:06:38 -0800
>
>Richard,
>
>I also did not see where they are coming up with bandwidth 2000 or OSPF
>cost 50.
>
>The pre-configs set R6's s1 interface to a clock of 64k. Based on a 64k
>leased line the OSPF cost would be 156. So the bandwidth statement
>should be set to 64.
>
>If this link is supposed to represent a T1 line then, the OSPF cost
>would need to be about 64. Bandwidth of 1540.
>
>BUT, when you look at the final configs for R6, they set the clock rate
>to 2000000. Based on that it fits with a bandwidth statement of 2000.
>
>Seems to be a discrepancy in this lab.
>
>Dan
>
>-----Original Message-----
>From: Richard Chung [mailto:richung@cisco.com]
>Sent: Thursday, November 21, 2002 7:03 AM
>To: Dotun Oni; ccielab@groupstudy.com
>Subject: Re: Bootcamp lab2; OSPF cost
>
>
>Dotun,
>
>Thanks for the reply.
>
>What I don't understand is why this question wants to get cost=50? I do
>not
>see any requirements for that.
>
>
>At 02:31 AM 11/21/2002, Dotun Oni wrote:
> >Richard,
> >
> >for 2-L:
> >
> >interface s1
> >bandwidth 2000 ------------- OSPF will use a cost of 50 as follows:
> >
> >Remember that you need to convert 2000kpbs to bps in calculating cost.
> >
> >i.e.
> >
> >cost = 100,000,000/BW(in bps) = 100,000,000/(2000 x 1000) = 50
> >
> >the reverse goes for 2-P
> >
> >
> >interface s0
> >ip ospf cost 50 ----------reflects cost for a bandwidth of 2000kbps
> >
> >HTH
> >
> >
> >D
> >
> >
> >>From: Richard Chung <richung@cisco.com>
> >>Reply-To: Richard Chung <richung@cisco.com>
> >>To: ccielab@groupstudy.com
> >>Subject: Bootcamp lab2; OSPF cost
> >>Date: Wed, 20 Nov 2002 22:59:47 -0500
> >>
> >>Hi, all,
> >>
> >>Can somebody help me to understand the config for 2-L? - Configure R6
>so
> >>that S1 interface speed is correctly reflected in the OSPF metrics
> >>without using the "ip ospf cost xxx" command.
> >>
> >>Another one. 2-P: Config R8 using the "ip ospf cost xxx" such that the
>
> >>speed of the link for interface S0 is correctly reflected in the OSPF
>metrics.
> >>
> >>I understand OSPF metric = 100,000,000/BW. But why it wants to get
>cost=50?
> >>
> >>Thanks.
> >
> >
> >_________________________________________________________________
> >Add photos to your e-mail with MSN 8. Get 2 months FREE*.
> >http://join.msn.com/?page=features/featuredemail
This archive was generated by hypermail 2.1.4 : Tue Dec 03 2002 - 07:23:08 GMT-3