Item DefaultGraceful Restart feature DisabledLocal preference 100MED 0Route Flap Damping Parameters half-life = 15 minutesreuse = 750suppress = 2000max-suppress-time = 60 minutesDistance external distance = 20internal distance = 200local distance = 200Timers keepalive = 60 secondsholdtime = 180 secondsAdd-path DisabledEnabling BGPBy default, BGP is not enabled on the system. Dell Networking OS supports one autonomous system (AS) and assigns the ASnumber (ASN).To establish BGP sessions and route traffic, configure at least one BGP neighbor or peer.In BGP, routers with an established TCP connection are called neighbors or peers. After a connection is established, the neighborsexchange full BGP routing tables with incremental updates afterward. In addition, neighbors exchange KEEPALIVE messages tomaintain the connection.In BGP, neighbor routers or peers can be classified as internal or external. External BGP peers must be connected physically to oneanother (unless you enable the EBGP multihop feature), while internal BGP peers do not need to be directly connected. The IPaddress of an EBGP neighbor is usually the IP address of the interface directly connected to the router. First, the BGP processdetermines if all internal BGP peers are reachable, then it determines which peers outside the AS are reachable.NOTE: Sample Configurations for enabling BGP routers are found at the end of this chapter.1. Assign an AS number and enter ROUTER BGP mode.CONFIGURATION moderouter bgp as-number• as-number: from 0 to 65535 (2 Byte) or from 1 to 4294967295 (4 Byte) or 0.1 to 65535.65535 (Dotted format).Only one AS is supported per system.NOTE: If you enter a 4-Byte AS number, 4-Byte AS support is enabled automatically.a. Enable 4-Byte support for the BGP process.NOTE: This command is OPTIONAL. Enable if you want to use 4-Byte AS numbers or if you support AS4 numberrepresentation.Border Gateway Protocol IPv4 (BGPv4) 163
