Avaya Configuring BFE Services Manuel d'utilisateur télécharger pdf (Page 26)

Configuring GRE, NAT, RIPSO, and BFE Services

2-2

305753-A Rev 00

How GRE Tunneling Works

A simple point-to-point GRE tunnel terminates at router interfaces at each end of

the tunnel (Figure 2-1

). Each of these interfaces has at least two addresses: a

physical address and one or more logical addresses. The physical address, which

is always an IP address, is visible to the devices making up the intervening

network cloud.

Figure 2-1. Simple GRE Tunnel Components

At each tunnel end point, there is one logical address for each protocol configured

for encapsulation over the tunnel (IP or IPX). The logical addresses are not visible

to the devices that make up the intervening network cloud. They are private

addresses, visible only to the networks on either side of the tunnel.

IP0095A

Router

Local logical

host interface

Local physical

router interface

Remote logical

host interface

Remote physical

router interface

GRE tunnel

Host

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Avaya Configuring BFE Services Manuel d'utilisateur Page 26