CCNP® Practical Studies: Routing

Configuring BGP

To start BGP on a Cisco router, the following command is required:

					router bgp
					autonomous system number
				

To define networks to be advertised, apply the following command:

					network
					network-number
					mask
					network-mask
				

You must be aware that the network command is not used in the same way you use it when you apply networks in OSPF or EIGRP. With BGP, you use the network command to advertise networks that originate from the router and need to be advertised through BGP.

To identify peer routers, apply the following command:

					neighbor
					ip-address | peer-group name
					remote-as
					autonomous system number
				

Next, you see how to configure IBGP and EBGP among the three routers in Figure 6-1. Example 6-1 displays the IBGP configuration on R1 to R2. ...