Ccna routing and Switching Complete Study Guide

933

The show ip bgp Command

With the 

show ip bgp

 command, the entire BGP table is displayed. A list of information 

about each route is displayed, so this is a nice command to get quick information on your 

BGP routes.

ISP#

sh ip bgp

BGP table version is 4, local router ID is 10.0.0.1

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, ? - incomplete

 

Network Next Hop Metric LocPrf Weight Path

*> 10.0.0.0/24 0.0.0.0 0 0 32768 i

*> 10.0.1.0/24 192.168.1.2 0 0 0 100 i

*> 10.0.2.0/24 192.168.2.2 0 0 0 200 i

The output is sorted in network number order, and if the BGP table contains more than 

one route to the same network, the backup routes are displayed on separate lines. We don’t 

have multiple routes, so none are shown.

The BGP path selection process selects one of the available routes to each of the net-

works as the best. This route is pointed out by the > character in the left column.

ISP1 has the following networks in the BGP table:

 

■

10.0.0.0/24, which is locally originated via the network command in BGP on the ISP router

 

■

10.0.1.0/24, which has been advertised from 192.168.1.2 (R1) neighbor

 

■

10.0.2.0/24, which has been advertised from 192.168.2.2 (R2) neighbor

Since the command displays all routing information, note that network 10.0.0.0/24, 

with the next-hop attribute set to 0.0.0.0, is also displayed. The next-hop attribute is set to 

0.0.0.0 when you view the BGP table on the router that originates the route in BGP. The 

10.0.0.0/24 network is the network that I locally configured on ISP1 into BGP.