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 ? Kind Regards...
I have got another question about this subject. 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. Regards...
>> If i use AS-path filter for both ISP connections , what will happen to redundancy ?
the idea is to use AS path based filters not to filter but to give preference (using local-preference or weight if this is the only eBGP router) to some specific routes received by the national ISP.
if you follow down my first lengthy post I suggest to use a route-map to increase local-preference or weight.
For example you can prefer international ISP for all destinations with loc-pref 150 or using weight 200.
Then for those routes identified as national the route-map provide a way to override that preference so that the routes received from the national ISP (only for those routes identified as national) are preferred. This can be achieved or using local preference 200 (>150) or weight 500 (> 200).
In this way you don't miss redundancy but in normal scenario makes traffic to go out international ISP for non national routes and to use the national ISP for national destinations
By the way i wonder , how can it be done symmetrical traffic flow in this scenario ? Local traffic goes from local ISP and the return traffic comes back through local ISP. Outside of the country traffic goes from international IPS and the return traffic comes back through internaional ISP. I don't want to cause any asymmetrical traffic flow between different ISPs and my site.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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