[c-nsp] Classify geographical traffic with BGP

[Ziv Leyes]

One possible option is to peer with your country's internet exchange point where all other "local" internet providers might be peering to as well, this way, the "local" traffic would be always preferred via the IX peer, and all the rest is aparently "international" therefore going out to your international ISP



-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Burak Dikici
Sent: Wednesday, April 15, 2009 2:46 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Classify geographical traffic with BGP

   Hello ,

  I have got one internet router running BGP , and this router has got
connections with two different ISPs. One of the ISP is local for my country
and the other ISP's location is outside of my country. I want to classify
geographical traffic with BGP. For example , local traffic to my country
will go through ISP-1 (local ISP) , outside traffic to my country will go
through ISP-2 (outside of my country ISP). What i have to do to achieve that
kind of configuration ? If i have to use AS path filter , how can i find the
local ISP AS path numbers and how can i configure AS path filter for this
request ? Is that enough using the as-path filter just for the national ISP
or should i use it for international ISP also ?

  If i use AS-path filter for both ISP connections , what will happen to
redundancy ? I mean , for example i filter national AS numbers at the
international ISP connection and deny them. Secondly , i filter national AS
numbers at the national ISP connection , permit them and the other AS
numbers will be denied. In this situation , what will happen if the local
ISP connection goes down ? Because of filtering of the national AS numbers
at the international ISP connection , the BGP table doesn't take any updates
from the local AS numbers. I hope , i could explain the situation correctly.


Kind Regards...

Burak Dikici
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