Use BGP maximum-paths eibgp with Caution

Under the BGP command process, "maximum-paths" enables BGP to perform load-sharing among multiple paths. There are 3 options:

1. maximum-paths: only allow equal-cost path load-sharing
2. maximum-paths ibgp: enable both equal-cost and unequal-cost path load-sharing for internal BGP
3. maximum-paths eibgp: enable both equal-cost and unequal-cost path load-sharing for both internal and external BGP

If you have 2 or more edge BGP routers on same AS and is using both iBGP and eBGP, use the "maximum-paths eibgp" with caution. The Cisco routers would assign iBGP routes with same administrative distance (i.e. 20) as eBGP. You could end up with a routing loop if you design eBGP to be preferred over iBGP paths.