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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

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Hp StorageWorks 8B FC Entry Switch Manual do Utilizador Página 9