The costs have recently been altered. This is reflected in the Cisco
Catalyst switch IOS (except the 1900 series).
Link Speed Cost (reratified IEEE spec) Cost (previous IEEE spec)
-----------------------------------------------------------------------
10 Gbps 2 1
1 Gbps 4 1
100 Mbps 19 10
10 Mbps 100 100
--
Edward Solomon
CCNA, CCSI
Senior I/T Specialist
Networking Solutions
IBM Canada Ltd. - Learning Services
Tel.: (905) 316-3241 Fax: (905) 316-3101
E-mail: [EMAIL PROTECTED]
Internet: http://www.can.ibm.com/services/learning/net_internet.html
"Phil Barker" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Hi,
> Just happened on this studying for CIT.
>
> Looking at how Root bridges calculate their respective
> costs using 10^9/Bandwidth.
> If the BW = 100Mbit/s then the cost = 10 i.e
> 10^9/100*10^6 = 10.
>
> Presumably if using a Gigabit link to root then the
> cost would be 1.
>
> My question is what will happen when Terrabit comes on
> board ? if this answer is < 1. Will the output be in
> floating point notation or will it be rounded to the
> nearest integer ?
>
> A cost of root of 0 and a cost to root of 0 could be
> confusing.
>
> Can anyone with a lab do a test with an E1/T1 link to
> verify the output ? I would myself but i'm 130 miles
> away from my lab.
>
> I get E1 = 488.28125 on paper.
> and T1 = 647.6684 for T1
>
> Does the output just show as integer or as a float ?
>
> Phil.
>
>
>
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