We use the BGP version 4.
BGP is in fact a TCP application that uses port 179.
iBGP (BGP inside the same AS).
eBGP (BGP between different AS).
The best choice is the shortest AS-PATH (by default).
Routing policies are present in BGP attributes.
BGP is a very slow protocol; we have a 5-sec interval update for iBGP and a 30-sec interval update for eBGP.
Authentication is possible with BGP (md5 auth).
Synchronization rule: a route learned by BGP must be present in the IGP routing table before being transmitted to any other BGP peers.
Split horizon rule: a route learned by iBGP must never be announced to another iBGP peer. This is why we always try to have a full meshed iBGP topology. In order to bypass this rule we must use Route Reflectors.
BGP is in fact a TCP application that uses port 179.
iBGP (BGP inside the same AS).
eBGP (BGP between different AS).
The best choice is the shortest AS-PATH (by default).
Routing policies are present in BGP attributes.
BGP is a very slow protocol; we have a 5-sec interval update for iBGP and a 30-sec interval update for eBGP.
Authentication is possible with BGP (md5 auth).
Synchronization rule: a route learned by BGP must be present in the IGP routing table before being transmitted to any other BGP peers.
Split horizon rule: a route learned by iBGP must never be announced to another iBGP peer. This is why we always try to have a full meshed iBGP topology. In order to bypass this rule we must use Route Reflectors.
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