Cisco LAN2LAN Software

Document ID: 14986

Contents

Introduction
Prerequisites
      Requirements
      Components Used
Symptom
Reason
Solution
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Introduction

Several anomalies have been discovered when using NE2000-compatible NIC adapters with the NCR Winbond 92C390 chip. These NCR chips, sold as National 8390-compatible chips, do not conform entirely to the National 8390 specification. This can cause the LAN²LAN to hang. NCR has acknowledged the problem with the chip in the LAN²LAN and other platforms. No solution has been proposed by NCR. This problem might not apply to workstations using NE2000-compatible NIC adapters. Cisco recommends that NE2000 compatible NIC adapters with NCR Winbond chipsets not be used in the LAN²LAN.

Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

This document is not restricted to specific software and hardware versions.

Symptom

The LAN²LAN, when using NE2000-compatible NIC adapters with the NCR Winbond 92C390 chip stops routing traffic. The keyboard does not respond and the clock stops.

Reason

The NCR Winbond 92C390 chip does not conform entirely to the National 8390 specification.

Solution

NE2000 and NE2000-compatible NIC adapters with the National 8390 chip do not experience this problem. Cisco recommends that NE2000 compatible NIC Adapters using the NCR Winbond 92C390 chip not be used in the LAN²LAN.

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