[c-nsp] BGP long prefix ads

[Gunther Stammwitz]

Hello Roman,


don't ever do that - pleaese don't de-aggregate as it will cause a tremendous
and unnecessary growth of the global routing table.
The best way to achieve incoming loadbalancing is to announce the same prefix to
both providers without any prepending in first place. If you should see problems
then you can still prepend one of the providers or use bgp-communities they
provide for a more granular and selective prepending.

Best regards,
Gunther


> -----Ursprüngliche Nachricht-----
> Von: cisco-nsp-bounces at puck.nether.net 
> [mailto:cisco-nsp-bounces at puck.nether.net] Im Auftrag von 
> Roman Bestuzhev
> Gesendet: Freitag, 11. Januar 2008 10:16
> An: cisco-nsp
> Betreff: [c-nsp] BGP long prefix ads
> 

> I am thinking about load balancing between both ISPs. I have 
> read about a technique when you divide your block to several 
> pieces, for example to two
> /22 blocks and advertise one of them to one ISP and other 
> block to another ISP and at the same time advertise whole 
> prefix to both ISPs, /21 in this case. This leads to getting 
> incoming traffic trough both providers and you can control 
> which subnets in your AS connect to Internet trough which ISP.