Chapter 2. Enabling Technologies

Introduction

Ethernet needs to be enhanced to be a viable solution for I/O consolidation. This section describes the required enhancements.

Lossless Ethernet

The term lossless Ethernet has been recently introduced to indicate an implementation of Ethernet bridges (i.e., switches) that do not lose frames under congestion.

Three questions come to mind immediately...plus one:

• Can Ethernet be lossless?

• Is a credit scheme required?

• Is lossless better?

...plus...

• Is anything else required?

PAUSE

Historically, there have been three possible causes of frames drop in Ethernet:

Frame Errors: A frame is received with an incorrect FCS (CRC). These errors are rare and can be recovered only ...

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