Mode

Specifies whether the BFD neighbor is single-hop or multi-hop connected. In single-hop mode, the UDP destination port 3784 and time-to-live of 1 are used in the IP header. Multi-hop mode uses UDP port 4784. In Automatic, single-hop mode is used if the route to the neighbor is of the type Connected LAN or WAN, otherwise multi-hop is used. By default, eBGP sessions are single-hop. iBGP sessions can be multi-hop.