ATM Configuration and Troubleshooting Guide

Conﬁguring EMS High Availability over ATM

Types of Failures Managed by EMS HA-ATM

Chapter 698

• EMS HA-ATM:

— Failure of one of the ATM adapters in the primary system.

— Failure of one of the ATM links connected to the ATM adapters in

the primary system.

— Failure of one of the ATM switches connected to the ATM

adapters in the primary system.

EMS HA-ATM in conjunction with MC/ServiceGuard provides remote

recovery for the following types of failures:

• System failure.

• Failure of all adapters in a system.

• Failure of all the ATM switches or cables connected to the adapters

in the primary system.

Failures Managed by Local Recovery

As mentioned above, local recovery manages failures of LAN Emulation

services, a single ATM adapter, a single ATM link, and a single ATM

switch. Each of these failures is described next.

LAN Emulation Services Failure

Your ELAN interface conﬁguration allows you to deﬁne secondary LAN

Emulation Services to eliminate single points of failure within an ELAN,

providing High Availability solutions. You can conﬁgure a secondary

LECS and secondary LES/BUS, which automatically take over if any of

the primary LAN Emulation services fail.

LAN Emulation Services for an emulated LAN are provided by the

following:

• A LAN Emulation Conﬁguration Server (LECS), which provides

conﬁguration information and the ATM address of the LAN

Emulation Server for an ELAN.

• A LAN Emulation Server (LES), which maintains MAC-to-ATM

address mappings for all end systems on an ELAN and manages

address resolution.