BGP routing is supported in Active/Standby and Active/Active HA configurations. Only the Active unit listens on TCP port for BGP connections from peers. BGP running between ASA in different autonomous systems is known as eBGP whilst BGP running between ASA in same autonomous systems is called iBGP.

 To configure BGP configuration use command below:

BGP routing on Cisco ASA

ASA# conf t
router bgp ASN
address-family ipv4 unicast
neighbor x.x.x.x mask y.y.y.y