Digital Equipment SmartSwitch SmartMIM-216 Manual de usuario

9032680

SmartTrunk

User’s Guide

Notice

Cabletron Systems reserves the right to make changes in speciÞcations and other information

contained in this document without prior notice. The reader should in all cases consult Cabletron

Systems to determine whether any such changes have been made.

The hardware, Þrmware, or software described in this manual is subject to change without notice.

IN NO EVENT SHALL CABLETRON SYSTEMS BE LIABLE FOR ANY INCIDENTAL, INDIRECT,

SPECIAL, OR CONSEQUENTIAL DAMAGES WHATSOEVER (INCLUDING BUT NOT LIMITED

TO LOST PROFITS) ARISING OUT OF OR RELATED TO THIS MANUAL OR THE INFORMATION

CONTAINED IN IT, EVEN IF CABLETRON SYSTEMS HAS BEEN ADVISED OF, KNOWN, OR

SHOULD HAVE KNOWN, THE POSSIBILITY OF SUCH DAMAGES.

Cabletron Systems, Inc.

P.O. Box 5005

Rochester, NH 03867-5005

Printed in the United States of America

Order Number: 9032680

Cabletron Systems

and

FNB

are registered trademarks and

SmartSwitch

SmartTrunk

, and

SmartMIM-216

are trademarks of Cabletron Systems, Inc.

All other product names mentioned in this manual may be trademarks or registered trademarks of

their respective companies.

Notice

FCC Notice

This device complies with Part 15 of the FCC rules. Operation is subject to the following two

conditions: (1) this device may not cause harmful interference, and (2) this device must accept any

interference received, including interference that may cause undesired operation.

NOTE:

This equipment has been tested and found to comply with the limits for a Class A digital

device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable

protection against harmful interference when the equipment is operated in a commercial environment.

This equipment uses, generates, and can radiate radio frequency energy and if not installed in

accordance with the operatorÕs manual, may cause harmful interference to radio communications.

Operation of this equipment in a residential area is likely to cause interference in which case the user

will be required to correct the interference at his own expense.

WARNING:

Changes or modiÞcations made to this device which are not expressly approved by the

party responsible for compliance could void the userÕs authority to operate the equipment.

VCCI Notice

This is a Class A product based on the standard of the Voluntary Control Council for Interference by

Information Technology Equipment (VCCI). If this equipment is used in a domestic environment,

radio disturbance may arise. When such trouble occurs, the user may be required to take corrective

actions.

Industry Canada Notice

This digital apparatus does not exceed the Class A limits for radio noise emissions from digital

apparatus set out in the Radio Interference Regulations of the Canadian Department of

Communications.

Le prŽsent appareil numŽrique n'Žmet pas de bruits radioŽlectriques dŽpassant les limites applicables

aux appareils numŽriques de la class A prescrites dans le R•glement sur le brouillage radioŽlectrique

ŽdictŽ par le minist•re des Communications du Canada.

iii

Notice

Declaration of Conformity

Addendum

Application of Council Directive(s):

89/336/EEC

73/23/EEC

ManufacturerÕs Name:

Cabletron Systems, Inc.

ManufacturerÕs Address:

35 Industrial Way

PO Box 5005

Rochester, NH 03867

European Representative Name:

Mr. J. Solari

European Representative Address:

Cabletron Systems Limited

Nexus House, Newbury Business Park

London Road, Newbury

Berkshire RG13 2PZ, England

Conformance to Directive(s)/Product Standards:

EC Directive 89/336/EEC

EC Directive 73/23/EEC

EN 55022

EN 50082-1

EN 60950

Equipment Type/Environment:

Networking Equipment, for use in a

Commercial or Light

Industrial Environment.

We the undersigned, hereby declare, under our sole responsibility, that the equipment packaged with

this notice conforms to the above directives.

Mr. Ronald Fotino Mr. J. Solari

____________________________________________________ ______________________________________________________

Full Name Full Name

Principal Compliance Engineer Managing Director - E.M.E.A.

____________________________________________________ ______________________________________________________

Title Title

Rochester, NH, USA Newbury, Berkshire, England

____________________________________________________ ______________________________________________________

Location Location

Notice

Contents

Chapter 1 Introduction

SmartTrunking............................................................................................................... 1-1

Packet Distribution ....................................................................................................... 1-2

Compatibility - DEC Hunt Groups and

GigaSwitch Router (GSR) ..................................................................................... 1-3

Chassis with Multiple SmartTrunk Groups .............................................................. 1-3

SmartTrunk and Port Connections ............................................................................. 1-4

Correspondence ............................................................................................................ 1-7

Chapter 2 SmartTrunk Conﬁguration

SmartTrunk ConÞguration Rules................................................................................ 2-1

SmartTrunking ConÞguration Screen ........................................................................ 2-3

Exiting the SmartTrunking ConÞguration Screen............................................. 2-5

Appendix A Helpful Hints for Conﬁguring SmartTrunk

Creating a Second Trunk Group ................................................................................ A-2

Removing an Entire Trunk Group ............................................................................. A-3

Removing a Port from a Group.................................................................................. A-3

Contents

1-1

Chapter 1

Introduction

Traditional 802.1D Spanning Tree Bridges only allow one active data path

between any two switches; all other parallel data paths are in Standby or Blocking

mode. If one interface or path should fail, then the other interface automatically

comes out of Blocking mode and forwards all of the trafÞc. This is Þne for

redundancy purposes. However, it is not the most efÞcient use of resources.

SmartTrunk, also referred to as SmartTrunking, is Cabletron SystemsÕ

terminology for load balancing or load sharing. SmartTrunk provides the ability

to take full advantage of the networkÕs redundant bandwidth. SmartTrunk

divides network trafÞc across multiple ports in parallel to provide additional

throughput. The SmartTrunk application can be used with any of DigitalÕs

MultiSwitch 700 switch modules (except ATM modules).

SmartTrunking

A physical port conÞgured in a SmartTrunk Group must:

¥ Be connected in a point-to-point link (full-duplex is recommended)

¥ Be connected to a port that is also conÞgured as part of a SmartTrunk Group

¥ Have Spanning Tree protocol enabled

Whenever a physical port is conÞgured in a SmartTrunk Group, the port will send

proprietary protocol messages (see PLAP and LLAP information in the

Compatibility section). Once the two switches at opposite ends of the link agree

that the trunking state is enabled, the SmartTrunk Group is established. As

additional ports are identiÞed as belonging to the same SmartTrunk Group, the

SmartTrunk Group is automatically reconÞgured to take advantage of the

additional paths.

Introduction

1-2

Packet Distribution

Packet distribution is based on hardware family type:

MultiSwitch 700

Packet distribution among the ports in the group is accomplished by adding the

destination

and

source

MAC addresses and then applying the modulus operator

to the sum using the number of active ports in the group. The remainder, which

falls into the range of the number of ports in the group, will dictate which port

will be used by the address. This gives a random distribution of the packet load,

but insures that the same destination-source ßow always goes out the same port.

This alleviates the possibility of out-of-order packets.

Modulus Examples

Ports contained in the trunk are labeled from zero (0) to one less than the number

of ports in the group. For example, if the physical ports in the group are

1 3 5 7 9, packet distribution would be based on the trunking port number

assigned. Trunking port numbers are 0 1 2 3 4.

The modulus operator divides the Þrst number by the second number and yields

a whole number remainder:

(sum of addresses) modulus (number of trunk ports) = remainder

For example:

5 mod 4 = 1

(Four goes into Þve once with a remainder of one)

4 mod 5 = 4

(Five goes into four no times with a remainder of four)

The remainder is the useful number that will fall between zero (0) and one less

than the number of trunk ports. This remainder will dictate which trunk port is

used to send the trafÞc by matching it to the trunking port number.

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