Border Gateway Protocol And Classless Interdomain Routing; Configuring Bgp - Cisco ONS 15454 SDH Configuration Manual

Chapter 11 Configuring Networking Protocols
P 192.168.1.0/24, 1 successors, FD is 30720
P 192.168.2.0/24, 1 successors, FD is 10752
P 192.168.3.0/24, 1 successors, FD is 28160
Example 11-13 show ip eigrp traffic Privileged EXEC Command Output
Router# show ip eigrp traffic
IP-EIGRP Traffic Statistics for process 1
Hellos sent/received: 273/136
Updates sent/received: 5/2
Queries sent/received: 0/0
Replies sent/received: 0/0
Acks sent/received: 1/2
Input queue high water mark 1, 0 drops
SIA-Queries sent/received: 0/0
SIA-Replies sent/received: 0/0

Border Gateway Protocol and Classless Interdomain Routing

Border Gateway Protocol (BGP) is an Exterior Gateway Protocol (EGP) that allows you to set up an
interdomain routing system to automatically guarantee the loop-free exchange of routing information
between autonomous systems. In BGP, each route consists of a network number, a list of autonomous
systems that information has passed through (called the autonomous system path), and a list of other path
attributes.
Layer 3 switching supports BGP version 4, including CIDR. CIDR lets you reduce the size of your
routing tables by creating aggregate routes resulting in supernets. CIDR eliminates the concept of
network classes within BGP and supports the advertising of IP prefixes. CIDR routes can be carried by
OSPF, EIGRP, and RIP.

Configuring BGP

To configure BGP routing, perform the following steps, beginning in global configuration mode:
Command
Step 1
Router(config)# ip routing
Step 2
Router(config)# router bgp autonomous-system
Step 3
Router(config-router)# network network-number
[mask network-mask ] [route-map route-map-name ]
Step 4
Router(config-router)# end
Example 11-14
Example 11-14 Configuring BGP Routing
Router(config)# ip routing
via 192.168.2.1 (30720/28160), POS0
via Connected, POS0
via Connected, FastEthernet0
shows and example of configuring BGP routing.
Cisco ONS 15454 and Cisco ONS 15454 SDH Ethernet Card Software Feature and Configuration Guide, R8.0
Border Gateway Protocol and Classless Interdomain Routing
Purpose
Enables IP routing (default).
Defines BGP as the routing protocol and starts
the BGP routing process.
Flags a network as local to this autonomous
system and enters it in the BGP table.
Returns to privileged EXEC mode.
11-27