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Notes:
In this example, we only consider the BGP messages concerning the following IP networks :194.100.0.0/24, 194.100.1.0.0/24 and 194.100.2.0/23. Routes concerning networks 195.100.* also need to be distributed, but they are not considered in the example.
The UPDATE message carries the ASPath in order to be able to detect routing loops.
The nexthop information in the UPDATE is often equal to the IP address of the router advertising the route, but it can be sometimes useful to advertise as a next hop another IP address than the address of the router producing the BGP UPDATE message. For example, a router supporting BGP could advertise a route on behalf of another router who cannot run the BGP protocol.