Enable ECMP for Multiple BGP Autonomous Systems

Perform the following task if you have BGP configured, and you want to enable ECMP over multiple autonomous systems. This task presumes that BGP is already configured. In the following figure, two ECMP paths to a destination go through two firewalls belonging to a single ISP in a single BGP autonomous system.

In the following figure, two ECMP paths to a destination go through two firewalls belonging to two different ISPs in different BGP autonomous systems.

1. Configure ECMP.
   See Configure ECMP on a Virtual Router.
2. For BGP routing, enable ECMP over multiple autonomous systems.
   1. Select NetworkVirtual Routers and select the virtual router on which to enable ECMP for multiple BGP autonomous systems.
   2. Select BGPAdvanced and select ECMP Multiple AS Support.
3. Commit your changes.
   Click OK and Commit.