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Routing protocols can be classified in
many ways. It depends on where they are used in relationship to
the enterprise. Protocols that run inside an enterprise are called
interior gateway protocols (IGPs). Examples of IGPs include RIP
versions 1 and 2, IGRP, EIGRP, and OSPF. Protocols that run outside an
enterprise, or between autonomous systems (ASs), are called
exterior gateway protocols (EGPs). Typically, EGPs are used to
exchange routing information between Internet Service Providers
(ISPs), or in some cases between a customer's AS and the
provider's network. Border Gateway Protocol, version 4 (BGP4), is
the most common EGP and is considered the Internet standard.
This module provides an overview of the different types of
autonomous systems and then focuses on basic BGP operation,
including BGP neighbor negotiation. The module also looks at how
to use the Cisco IOS to configure BGP and verify its operation.
Finally, it examines BGP peering and the BGP routing process.
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