BGP conditional advertisement + object tracking

Question:

Hope someone can help,WS-C3560X-48T-S  we have multihomed environment advertising 4 prefixes to both ISPs and running an iBGP between two routers. Both ISPs send us default routes. Attached diagram to understand how we are connected.

Issue: traffic for prefix x.x.x.x/24 is taking a path from AS-2 which is what i dont want, reason being bandwidth is highly utilized. We have higher bandwidth for AS-1.

I have been trying to get a solution setup in much unconventional way to influence inbound path by not advertising 2 prefixes to AS-2. The issue we have is we are a private AS and cannot influence inbound traffic taken from dual-homed ISPs, part of the problem is AS-2 is now using AS-1 as a transit provider.

what i would like to do is for AS-2 link only advertise prefixes a.a.a.a/24 and b.b.b.b/24 whilst eBGP peer/interface is up for AS-1, if the link with AS-1 is down advertise a/b/x and y prefixes to AS2. This way i can control traffic destined to x/24 prefix will not take path through AS-1. I have been trying object tracking using ip sla's, prefix advertisements etc, is there a neater solution then what i have been trying.

Answer:

There is one useful link

http://openweb.or.kr/wp-content/uploads/2012/03/BGP-MHing-HOWTO-whitepaper.pdf

But if local communities not helping you should contact to your ISP.

If you can aggreagate these subnets x.x.x.x/24 and y.y.y.y/24 into subnet with mask 23. It's better to advertise a summary from secondary router and more specific from primary.WS-C3560V2-24TS-S Price