Boder Gateway Protocol

Message Type: Four different message types are used in BGP-4:
• Open messages—Used to establish connections with peers.
• Keepalives—Sent periodically between peers to maintain connections and verify paths held by the router sending the keepalive. These packets are sent unreliably. If the periodic timer is set to a value of 0, this equates to infinity, and no keepalives are sent.
• Update messages—Contain paths to destination networks and the path attributes. Routes that are no longer available or withdrawn routes are included in updates. There is one path per update, requiring many updates for many paths. The information contained in the update includes the path attributes such as origin, Autonomous System path, neighbor, and inter-Autonomous System metric.
• Notification—Used to inform the receiving router of errors.

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