Hi, i have big trouble, maybe sombody knows how i can solve it.
Look, i have network like in attachement. I have full view and default gateway from ISP 1 by BGP, then for R1 and R2 def. gw is ISP1 IP. For R3 and R4 is similar situation but from ISP 2. In case if link 1 goes down then default gateway must be from ISP 2. But my problem in following:
when link 1 goes down, i still receieve default gateway from ISP 1 becouse BGP session doesn't go down. I tried to solve the problem in that way: i created ip sla track and attache it to static route(0.0.0.0/0). My ip sla test ping R0 IP address and if it goes down then traffic will go through ISP 2, but i think that it is not the right way, becouse R2 still recieve default gateway from ISP1. How i can solve it without ip sla?
I think u don't understand me. Link beween R1 and ISP 1 is available and BGP session is OK, but internet doesn't work, becouse ISP 1 has some poblems with there network and i want to forward trafiic through ISP 2 if i can't reach R0 IP through ISP1
Well not to sound rude - but welcome to the internet. Everybody who runs routers with BGP and peers with providers faces the same issue. As your router is receving a valid route from the ISP, why would'nt it use it ?? - that's the whole point.
There is no right or wrong solution to this - if IP SLA works for you, crack on. On the other hand if it happended to me I would be picking up the phone and giving my ISP a peice of my mind, along with a request to get some of my circuit rental money back. But loops and blackhole routing occur in the internet - it's just one of those things I am afraid.
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