BGP is an IP exterior routing protocol
defined in RFCs 1163, 1267, 1654, and 1655 which guarantees a
loop-free interdomain routing system through the exchange of routing
information between ASs. BGP differs from IGPs mentioned earlier in
the following ways:
- BGP is a policy-based routing
protocol. It does not use technical metrics, but rather makes
routing decisions based on network policies.
- BGP updates are carried in TCP
segments. This means IP connectivity must exist between BGP
peers and TCP connections must be negotiated between them before
updates can be exchanged.
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