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Webcast-Catalyst9k
New Member

BGP bandwidth consumption

Hi all,

I'm trying to calculate our BGP bandwidth consumption. In RFC 1774 the formula is MR = O(N + M * A) (http://tools.ietf.org/html/rfc1774)

My question is…what is 'O' ??

thanks very much,

Andres

3 REPLIES
New Member

Re: BGP bandwidth consumption

not much sure.. but I think it is '4' byte AS number..

Hall of Fame Super Silver

Re: BGP bandwidth consumption

Hello Andres,

usually O is a math symbol and means proportional to the formula inside ()

here:

N= number of routes in internet

A= total number of ASes in internet

M= average AS path length = average AS distance

try to make the calculations in the example you will see a factor something less 4

Hope to help

Giuseppe

New Member

Re: BGP bandwidth consumption

Hi Giuseppe,

Thanks for the response. After your comment and a conversation with a colleague yesterday I am satisfied the O is Big-O notation.

Some things still don't make sense... the answer I get in example 1. 10000, 15, 300 is "in the order of" (Big O) 14500. Why is there a factor of 3.7 or so to derive the Bandwidth? where did this come from?

Also, none of the variables are in Bytes but the answer is in bytes. Where did those units appear from?

Regards,

Andres

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