Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Bedienungsanleitung PDF herunterladen (Seite 162)

Configuring IP Exterior Gateway Protocols (BGP and EGP)

8-2

308628-15.0 Rev 00

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 (Figure 8-1

Figure 8-1. EGP Connection Between Two Autonomous Systems Running RIP

The Nortel Networks implementation of EGP complies with RFCs 827 and 904.

EGP runs over the same LAN and WAN media/protocols that IP runs over,

including Ethernet*, token ring, synchronous, Nortel Networks 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

BGP

connection

AS1

AS2

RIP

IP00026A

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Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Bedienungsanleitung Seite 162