ATM Configuration and Troubleshooting Guide

Conﬁguring SVCs and PVCs

Creating a Back-to-Back Connection

Chapter 586

Creating a Back-to-Back Connection

A back-to-back connection is used when a direct link without an ATM

switch is required between systems; for example, when ATM is used as a

high-speed channel between a workstation and an HP server. Figure 5-3

below shows a back-to-back connection.

NOTE Only Classical IP over ATM is supported on back-to-back connections.

Figure 5-3 Back-to-Back Connection

The following restrictions apply to a back-to-back connection:

• Because the connection establishment is not symmetrical, a

back-to-back connection between two ATM adapters must use only

PVCs. A PVC using the same VCI/VPI must be deﬁned on each

system.

• ATM 155 Mbit/s adapters can be conﬁgured back-to-back only with

other 155 Mbit/s adapters, and ATM 622 Mbit/s adapters only with

other 622 Mbit/s adapters.

• Two adapters conﬁgured back-to-back must have the same type of

interface (MMF, SMF, or UTP Cat 5).

• The ATM network preﬁx must be conﬁgured manually to deactivate

ILMI address registration.

• Both nodes in a back-to-back connection must be conﬁgured as ATM

ARP Servers.

Back-to-back configuration