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Introduction

The TAP mechanism does not work across IS-IS Areas because it distributes

information using IS-IS Level 1 LSPs. However, it is likely to have a considerable

number of nodes in the OSI network and multiple areas.

Connecting areas

To allow DSwT nodes to communicate across IS-IS Areas enjoying the benefits of the

auto-provisioning, a pair of "tunnels" must be manually configured between the areas.

This principle is illustrated in the following figure.

Connecting areas principle

A pair of provisioned "Tunnels" connecting any two nodes, one from each area,

provides bi-directional communication between the Areas.

NOTE: TAP "Tunnels" are not transitive. That is a "Tunnel" connecting Areas A and

B, and a "Tunnel" connecting Areas B and C does NOT connect Areas A and C. A

separate "Tunnel" between Areas A and C is needed.

365-312-807R7.2

Issue 4, May 2007

Alcatel-Lucent - Proprietary

See notice on first page

4-27

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Dswt Connecting Areas With Manual Tap Tunnels - Alcatel-Lucent 1643 AMS User's Operation Manual