On 14 December 2010 13:42, ibtisam jamal <ibty.jamal@gmail.com> wrote:

Hi ,

I have this scenario i have 2 ISP's . I do eBGP with both of them.
ISP 1 -send /24 subnets
ISP 2 - send /23 subnets

what we want to achieve is automatic failover .Such that if ISP1 fails
traffic goes to ISP 2 automaticaly.

But when testing this live ...something strange happens traffic goes
out through ISP 1 which is wat we want .BUt incoming traffic uses ISP
2.

How was the test simulated?

Was ur BGP session taken down during the test?

If your purely doing BGP with your provider, your routes should have disappeared from their side during the test.

For cisco there are good examples on the net but for juniper Mx series
or just any junos we cant find examples.

Juniper's site has pretty good detailed examples, just like Cisco if not better.

something about AS-PREPEND and playing with metrics.We want to keep it
as simple as possible.THat why we opted to use the more specific
subnet method.

Theres nothing complex about AS-PREPEND, if you have two providers, your advertisments should be consistent across both, then use prepends to select which subnet should go through which provider.