IP and ARP on Fibre Channel

                          Implementation


                          Dan Eisenhauer
                  IBM RISC System/6000 Division
                    Fibre Channel Development
                          Austin, Texas

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IBM Fibre Channel Adapter/266 - Product Overview

  o  Draft ANSI Fibre Channel Standard 4.2 with deviations

  o  Type 5 Micro Channel Adapter

  o  1/4 Speed (266 Mb/s)

  o  Classes 1, 2 and Intermix Supported

  o  Supports TCP/IP

  o  Raw sockets interface

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FC-2 Frame Header Parameters

  o  R_CTL Indicates Device Data and Unsolicited Data

  o  TYPE indicates LLC/SNAP Encapsulation

  o  Network, Expiration/Security, and Device Headers are not used

  o  Error Policy is Discard Single

Initializing IP Packet Exchange

  o  Explicit Fabric and N_Port Login

Sending IP and ARP packets

  o  LLC Header

  o  SNAP Header

Use of Exchanges

  o  One exchange to send IP/ARP to other N_Port

  o  IP Exchanges are long lived

  o  IP Exchanges to ARP Server are for a single request or reply

Errors and Exception Conditions at the Exchange Responder

  o  As specified by FCSI Common Features and IP Profiles

Errors and Exception Conditions at the Exchange Originator

  o  As specified by FCSI Common Features and IP Profiles

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Address Resolution Procedures

  o  IP Address corresponds to one N_Port

  o  ARP Server Registration

  o  Reregistration timer (9 minutes)

  o  Local Mapping via arp command

  o  Point-to-Point

ARP Server

  o  Handles within adapter microcode

  o  Nameserver alias is obtained via vendor unique protocol

  o  20 minute timeout

Fair Access and Resource Starvation

  o  Class 1 connections are limited to single sequence

Guidelines for using different classes of service

  o  <=256 bytes - Class 2

  o  >256 bytes - Class 1

MTU

  o  MTU is 65280