HP StorageWorks 8B - FC Entry Switch Manuale utente

user's guide

version 3.0

isl trunking

www.hp.com

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Edition: E1201

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ISL Trunking User’s Guide iii

Contents

Preface

About This Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

Related Publications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

Getting Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii

Getting Software Updates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii

Chapter 1 Introducing ISL Trunking

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Advantages of ISL Trunking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Trunking Groups, Ports and Masters . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Chapter 2 Installing ISL Trunking

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Installing ISL Trunking through Telnet . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Installing ISL Trunking through Web Tools. . . . . . . . . . . . . . . . . . . . . . 2-2

Chapter 3 Using ISL Trunking

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Administering ISL Trunking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Frequently Asked Questions about ISL Trunking . . . . . . . . . . . . . . . . . 3-4

Glossary

Index

iv ISL Trunking User’s Guide

ISL Trunking User’s Guide v

Preface

ISL Trunking is a licensed option that requires a valid license key to function. It is included and

enabled in switches with the performance upgrade option. It is supported for the HP Surestore FC

1Gb/2Gb Entry Switch 8B, FC 1Gb/2Gb Switch 8B, and FC 1Gb/2Gb Switch 16B products using

Fabric OS version 3.0.1b or later.

About This Guide

This guide provides the following information about ISL Trunking:

Related Publications

Related product information can be found in the following publications.

Provided with the FC Entry Switch 8B and FC Switch 8B:

•HP Surestore FC 1Gb/2Gb Entry Switch 8B and FC 1Gb/2Gb Switch 8B Getting Started

Guide (A7346-90902)

•HP Surestore FC 1Gb/2Gb Entry Switch 8B and FC 1Gb/2Gb Switch 8B Documentation

CD (A7346-11001)

Chapter 1

Introducing ISL Trunking Overview of the ISL Trunking feature.

Chapter 2

Installing ISL Trunking Instructions for installing an ISL Trunking license key.

Chapter 3

Using ISL Trunking Information on how to use the ISL Trunking feature with telnet

commands or Web Tools. This chapter also includes a

Frequently Asked Questions section.

vi ISL Trunking User’s Guide

Provided on the FC Entry Switch 8B and FC Switch 8B Documentation CD, and at the HP Web site

at http://www.hp.com/support/fc8B:

•HP Surestore FC 1Gb/2Gb Entry Switch 8B and FC 1Gb/2Gb Switch 8B Getting Started

Guide (A7346-90902)

•HP Surestore FC 1Gb/2Gb Entry Switch 8B and FC 1Gb/2Gb Switch 8B Installation and

Reference Guide

•Fabric OS Reference Manual, version 3.0

•Fabric OS Procedures Guide, version 3.0

•Fabric OS Version 3.0.1b Release Notes

•Fabric Watch User’s Guide, version 3.0

•QuickLoop User’s Guide, version 3.0

•Web Tools User’s Guide, version 3.0

•Distributed Fabrics User’s Guide, version 3.0

•Zoning User’s Guide, version 3.0

•MIB Reference Manual, version 3.0

•ISL Trunking User’s Guide, version 3.0

•Advanced Performance Monitoring User’s Guide, version 3.0

•Merging Heterogeneous Fabrics Instructions

Provided with the FC 16B:

•HP Surestore FC 1Gb/2Gb Switch 16B Quick Start Guide (A7340-96002)

•HP Surestore FC 1Gb/2Gb Switch 16B Documentation CD (A7340-11001)

Provided on the FC 1Gb/2Gb Switch 16B Documentation CD and at the HP Web site at

http://www.hp.com/support/fc16B:

•HP Surestore FC 1Gb/2Gb Switch 16B Quick Start Guide (A7340-96002)

•HP Surestore FC 1Gb/2Gb Switch 16B Installation and Reference Guide

•Fabric OS Reference Manual, version 3.0

•Fabric OS Procedures Guide, version 3.0

•Fabric OS Version 3.0.1 Release Notes

•Fabric Watch User’s Guide, version 3.0

•QuickLoop User’s Guide, version 3.0

•Web Tools User’s Guide, version 3.0

•Distributed Fabrics User’s Guide, version 3.0

•Zoning User’s Guide, version 3.0

•MIB Reference Manual, version 3.0

•ISL Trunking User’s Guide, version 3.0

•Advanced Performance Monitoring User’s Guide, version 3.0

•Merging Heterogeneous Fabrics Instructions

Information about Fibre Channel standards and Fibre Channel in general can be found on the Fibre

Channel Industry Association Web site, located at http://www.fibrechannel.com.

ISL Trunking User’s Guide vii

Getting Help

For information for the FC Entry Switch 8B and FC Switch 8B, visit the HP Web site at

http://www.hp.com/support/fc8B.For the most current technical support information for the

FC 16B, visit the HP Web site at http://www.hp.com/support/fc16B. This includes hardware and

software support, all repairs, and spare components.

Be prepared to provide the following information to the support personnel:

•Switch serial number

•Switch world wide name

•Output from the supportShow telnet command

•Detailed description of the problem

•Topology configuration

•Troubleshooting steps already performed

Getting Software Updates

For information on obtaining software updates contact your HP account representative or technical

support.

viii ISL Trunking User’s Guide

ISL Trunking User’s Guide 1-1

Chapter

Introducing ISL Trunking

This chapter provides the following information:

•Overview on page 1-1

•Advantages of ISL Trunking on page 1-1

•Trunking Groups, Ports and Masters on page 1-3

Overview

Interswitch Link (ISL) Trunking is an optionally licensed product available on the FC Entry Switch

8B, FC Switch 8B, and FC 16B switches with Fabric OS version 3.0.1b or later. ISL Trunking is

managed using telnet commands or the Web Tools interface.

The ISL Trunking feature allows up to four ISLs, connections between two switches through an

Expansion Port (E_Port), to merge logically into a single link. When using ISL Trunking to

aggregate bandwidth of up to four ports, the throughput of the ISLs between switches in a fabric is

quadrupled. For example, at 2 Gb/Sec speeds, ISL Trunking delivers ISL throughput of up to 8

Gb/Sec.

ISL Trunking also supports high-bandwidth, large-scale Storage Area Networks (SANs) which

include core switches. The primary task of ISL Trunking is to route data and edge switches that

aggregate connections to servers and storage. ISL Trunking simplifies network design and reduces

the cost of storage management by optimizing bandwidth utilization and enabling load sharing of

traffic at the frame-level.

For a list of frequently asked questions about the ISL Trunking Feature, refer to Frequently Asked

Questions about ISL Trunking on page 3-4.

Advantages of ISL Trunking

The ISL Trunking feature enhances switch to switch performance in Storage Area Networks while

simplifying management and improving reliability. Advantages of the ISL Trunking feature

include:

•Combining up to four ISLs into a single logical ISL

•Load sharing traffic across all ISLs in a trunk

•Maintaining in-order delivery of frames

•Avoiding rerouting if one of the server links between two switches fails

•Simplifying management by implementing fewer ISLs

1-2 ISL Trunking User’s Guide

Introducing ISL Trunking

Routing without the ISL Trunking Feature

Prior to the implementation of the ISL Trunking feature, device-level load sharing was done

through Fibre Channel networks that created ISLs and operated with the Fibre Channel Shortest

Path First (FSPF) routing protocol. The protocol established and communicated the shortest paths

for data to be carried from source to destination. Load sharing multiple ISLs to connect two

switches was established by a round robin algorithm that assigned the next available ISL as part of

the link to connect a Host Bus Adapter (HBA) and storage. Depending on the fabric event

sequences, multiple HBAs shared an individual ISL. This type of load sharing sometimes caused

the fabric to have congested input/output traffic over the ISLs connecting two switches.

Although FSPF compliant switches ensure fixed routing paths, and guarantee that all frames are

delivered in order, congestion occurs if the aggregation of the stream exceeds the capacity of one of

the ISLs in the path.

For example, Figure 1-1 shows four untrunked ISLs with a maximum capacity of 2Gb/Sec each, for

a maximum throughput of 8Gb/Sec. Due to traffic that is not trunked, the throughput of the four

ISLs is: 1Gb/Sec + 1.5Gb/Sec +.5G + 1Gb/Sec + 1Gb/Sec, giving a total of only 5Gb/Sec, because

two 2Gb/Sec data streams are competing for the same path.

Figure 1-1 Routing without the ISL Trunking Feature

Routing with the ISL Trunking Feature

ISL Trunking ensures that all links are used efficiently, eliminating congestion on one link, while

distributing the load of the links. This feature is designed to significantly reduce traffic congestion.

As shown in Figure 1-2, four ISLs are combined into a single logical ISL with a total capacity of

8Gb/Sec.

The ISL Trunking feature distributes workload across all ISLs in a trunk. Each incoming frame is

sent across the first available ISL. As a result, transient workload peaks for one system or

application are much less likely to impact the performance of other parts of SAN fabric. Because

the full bandwidth of each physical link is available, bandwidth is efficiently allocated.

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