Re:[isp-bgp] isp-bgp digest: October 30, 2004

["Mostafa Ali" <mmostafa@...>]

From: "Marcelo Moulin" <reckor@....br>

>     Second, as you said,  i will use BGP only between ISP1 (ISP2) and
> 3660 and other protocol (iGRP or RIP) between 3660 and 7200 ?
>
>     How BGP in 3660 will load balacing requests from my network without
> being equal? I mean if i'm using 1.3 mb from ISP1 and 512k from ISP2 and
> my delay time to access X (in the internet) is 0.7 ms in ISP1 and 0.3 ms
> in ISP2, how BGP will choose the best option?
>



Well , its better to throw away your 3com . as your links are not of equal
capacity ,  you will be obliged to receive partial BGP table plus default
from your upstream providers in order to achieve load balancing over none
equal links .


> Filter incoming updates from both providers , just accept networks of your
interest (  your major upload  & download ) plus default


> Try to divide them into two groups such that group a will have upload  75%
of 1.3 Mbps and group B 75% 512Kbps , and prefer each group using the weight
attribute to reflect each provider , and for any other packets using the
default so enable maximum-paths 2 under BGP router config-mode

> Implement ur inbound traffic policy using the same procedure as for ur
outbound traffic policy using as path prepend , divide your prefixes into 2
groups ...

> Netflow export will make it easy for you to know your traffic distribution
, check http://www.splintered.net/sw/flow-tools/

> Also check http://www.nanog.org/mtg-0410/pdf/smith.pdf


Regards
Mostafa Ali








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