ATM Configuration and Troubleshooting Guide

Conﬁguring EMS High Availability over ATM

Types of Failures Managed by EMS HA-ATM

Chapter 6 101

ATM Adapter/Link/Switch Failure

Local recovery for an adapter, link, or switch failure requires a speciﬁc

kind of conﬁguration. The conﬁguration, and what happensif an adapter,

link, or switch fails, are discussed below.

Necessary Conﬁguration The local recovery solution relies on the

recommended conﬁguration of having at least two identical ATM

adapters per system, with the adapters connected to separate switches.

One exception to this recommendation exists: Hewlett-Packard supports

local recovery when the primary ELAN interface is conﬁgured on a

J2468A (ATM-HSC 622 Mbit/s) adapter and the secondary interfaces are

conﬁgured on a J2469A (ATM-HSC 155 Mbit/s [+]) adapter. However,

because of the difference in transfer rates between these two adapters,

only the UBR trafﬁc parameter is supported in this conﬁguration.

(Although the J2468A adapter is being discontinued beginning with this

release, this information is still included for backwards compatibility.)

Note that when different types of cards are conﬁgured as primary and

secondary, a warning appears while you are in SAM.

NOTE An ATM adapter must be conﬁgured either with primary ELAN

interfaces or secondary ELAN interfaces. A mix of primary and

secondary ELAN interfaces on a single adapter is not possible. However,

you can run Classical IP on an adapter used to provide backup ELAN

interfaces.