Outbound Traffic Manage via eBGP

Question:

We are using multihomed eBGP Cisco 3560X  in single Router from multiple ISPs bandwidth for internet.

We have our own IP Address , at present our oubound traffic going throug ISP 1 , when ISP-1 b/w goes down then it will autometic traffic going throug ISP-2 bydefault.

But our required when ISP-1 B/W goes down our all outbound traffic will going throug ISP-3 inplace of ISP-2.

How can i achieve this as per our requirement.

Answer:

Another option is to specify weight - with again giving  the higher vaule to the most preferred path.

Local pref on a single router is a possibility but as I understand it, It would usually be best utilised with ibgp peering-res

ust to clarify - do you mean when the link on ISP1 goes down? It is just that you said "when ISP-1 b/w goes down" which could be interpreted differently.

It would be helpful if you could share your existing configs but the solution that springs to mind is to use local preference on the BGP learned routes with ISP1 routes having a higher local preference than ISP3.

Yes - that will do it. Ignore my comments about Local Preference - for some reason I thought you had 3 routers on site which is why I recommended LP. Weight is a better option if you have a single router.

You can do the configuration as you have written above or write a route-map statement to apply weight Catalyst 3560 Price to the routes learned from each peer.