A customer who has 2mg link from ISP1 would like to purchase 2nd and 3rd 2mg from ISP2,
The link from ISP1 is connected on RT1 and The link from ISP2 is connected on RT2 ( RT2 has 2 link )
can some one tell me how can i do a load blance as well as each link should be work as back as well to one another
Do you have your own ip blocks available with you ? or using the subnets given by the ISPs ?
if you are having your own ip blocks you can try configuring GLBP and have outbound load balancing.
I don't think you will get inbound load balancing as well.