BGP

This is the EGP (External Gateway Protocol) protocol used for routing the traffic in the internet. The major concept is AS which is Autonomous System number, which is the building block of the internet, BGP routes traffic between these AS (blocks).

Running Pure BGP:

If BGP is the only routing protocol inside your network, you should define the linking networks between the routers to have full connectivity. Because the absence of IGP (RIP, OSPF,…) will cause that BGP won't know about these networks.

Configuration:

Begins with ()#router bgp 100, AS number = 100

This will initiate the bgp process, aafter that you need to define your internal networks:
(-router)#network 1.1.1.1 mask 255.0.0.0

Then you've to define the neighbors;
(-router)#neighbor 2.2.2.2 remote-as 200

Those are the basic commands, that must be done to run bgp


I hope that was informative for you…and don't hesitate to comment if you need any further help