background image
Chapter 8
Configuring Basic BGP
n Chapter 7 we looked at how BGP is used, when to use BGP, when not
to use BGP, and the type of protocol BGP is, and we focused on the attributes
sent in BGP update messages. In this chapter, we looked at how to enable
BGP, identify the network number the router belongs to so it can be adver-
tised to its neighbors, identify the BGP neighbors, and assign the Weight
In addition, we covered how to configure several other attributes, such as
the Next-hop, MED, Atomic Aggregate, and Local Preference attributes.
Then we covered the show commands that can be used to verify the config-
uration and troubleshoot problems that might arise in the configuration
of BGP.
As you may have noticed while looking at some of the output that
appeared throughout the chapter, BGP has many command syntaxes that
make configuring BGP very complex--much more complex than we will
cover in the following Hands-on Lab section below. In Chapter 9, we will cover
many more aspects of BGP, including the addition of filters and policies,
route flapping, and using BGP in large-scale networks.
Key Terms
Before taking the exam, make sure you are familiar with the following term:
peer group
Commands Used in This Chapter
Allows you to configure aggregate routes
in BGP and CIDR addressing.
bgp default local-
Allows you to assign a Local Preference
attribute value in the range of 0 to
4,294,967,295. Higher values are
preferred over lower values.
clear ip bgp
Allows you to clear all or an identified set
of routes from the BGP table.
Copyright ©2001 SYBEX , Inc., Alameda, CA