BGP stands for a Border Gateway Protocol. The lastest BGP version is 4. It is referred as BGP-4. BGP-4 is one of the Exterior Gateway Protocols and de-fact standard of Inter Domain routing protocol. BGP-4 is described in RFC 1771.
You can find the BGP Settings at Routing → BGP.
You can set a Router ID that is advertised or let the system configure one automaticlly.
AS Number is an identification of autonomous system and must be unique within your AS.
Redistribute Kernel Routes lets BGP automatically distribute Kernel Routes.
Redistribute Static Routes lets BGP automatically distribute Static Routes.
Redistribute Connected Routes lets BGP automatically distribute Connected Routes.
Please be aware that VT AIR static routes are classified as kernel routes.
Networks let you advertise additional networks. You can advertise as many extra networks as you like.
17.5.1. BGP Neighbor¶
Each BGP Instance that you want to communicate with needs to be created as a Neighbor under Routing → BGP → BGP Neighbor.
Neighbor is the IP Address of the Neighbor.
AS Number is the AS number of the neighbor.
Advanced Settings have a lot of options to customize the neighbor relationship. Please refer to the FRR manual for a detailed explanation FRR BGP.