
Configuring IP Services
9-2 117356-A Rev. A
EGP Concepts and Terminology
EGP-2 is an exterior gateway protocol used to exchange network reachability
information between routers in different autonomous systems. In each, AS routers
share routing information using one or more interior gateway protocols -- for
example, RIP or OSPF. The routers that serve as end points of a connection
between two ASs run an exterior gateway protocol, such as EGP-2 ( F
igure 9-1).
Figure 9-1. EGP Connection between Two Autonomous Systems Running RIP
The Bay Networks implementation of EGP complies with RFCs 827 and 904. It
runs over the same LAN and WAN media/protocols that IP runs over, including
Ethernet, token ring, synchronous, Wellfleet Proprietary Synchronous, frame
relay, SMDS, X.25 (DDN, PDN, Pt-to-Pt), ATM PVC, FDDI, T1, E1, HSSI, and
PPP.
Note: EGP assumes that each advertised network is a natural class network
(A, B, or C) based on its high-order bits. EGP cannot advertise or interpret
subnets or supernets.
RIP/
EGP
RIP/
EGP
RIP
RIP
RIP
BGP
connection
AS1
AS2
RIP
RIP
IP00026A
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