Re: BGP Configuration with two ISP

narendrakurajak1 · ‎10-13-2017

Hi,

Please help in achiving the scenario discribed below:

We want to configure BGP with two different ISP.

What would be the prerequisite for this?

Our requiremnet is to load balance the load of internal traffic too.

We have IP block of 16 IPs from one ISP and need the reachablility of these public IPs from different ISP.

Would Each ISP provide their Private AS no. or only AS no from One ISP can work.

Else we have to go with Public AS no.

I am not able to work on this scenario due to not very well knowledge of BGP.

Your help is really appreciated.

Please ask if any other information is required.

Mark Malone · ‎10-13-2017

Hi

do you have 1 router with 2 ISP links or 2 routers with 1 link each , this may help you , its design guide look at the section below for BGP it will give you an idea of the config setup , AS and how to share accross multiple paths , you will need to engage both ISPs anyway , you should setup a call with them

Load Sharing When Dual-Homed to One ISP Through Multiple Local Routers

Load Sharing When Dual-Homed to One Internet Service Provider (ISP) Through a Single Local Router

https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13762-40.html#anc27

Georg Pauwen · ‎10-13-2017

Hello,

in addition to Mark's post, here is another link with sample topologies and configurations:

http://showipbgp.com/bgp-configurations/cisco.html