Last year we acquired another company who were an ISP and we have now been asked to connect the two networks. They have their own transit provider and AS number as do we. We are going to create a link between our site and them and use it as a resilient link if our main one goes down. The link we have is a 34Mb upstream connection to INS and the link to the other site is 10Mb. I want to configure BGP to load balance some traffic over to them and set it up so if the INS link goes down it will switch over to the other connection.
If anyone could give me any guidance i would appreciate it,
As said by Tran, achieving a perfect load balance using BGP is almost impossible. You can influence how the traffic will leave your AS but you cant make sure that the returning traffic will take the same path.
You can influence the leaving traffic by just setting the local preferences. As a tentative to influence how the traffic would return, you could append your own AS number into the AS-PATH several times when sending out updates to other ASs then yours. However, dont count on it since this padding can be removed.
A key point that you dont mention is the link speed between the two companies. Be aware that if you are connecting two end points ASs (ASs that currently have only one connection to the Internet) they can become transit ASs for the Internet. If you do not configure your ASs properly the link between the two companies (ASs) will carry traffic for the Internet.
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