Link Layer Overview

Detailed Link Layer Description

This section provides an overview of the Link Layer. A detailed description of the Link Layer can be found in the chapter entitled “Detailed Description of the Link Layer” on page 599.

Link Layer Functions

The functions performed by the Link Layer are:

  • In CAs, performs packet formatting (LRH and CRCs) and, in switches, guides the packets (using switch Forwarding Tables) along the proper path between the requester and responder within the subnet.

  • Implements two or more Virtual Lane (VL) transmit/receive buffer pairs. See “Virtual Lanes” on this page.

  • The SL (Service Level) field within each packet defines the desired QoS as the packet is transported through the subnet. Each port the packet passes ...

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