Digital Equipment SmartSwitch SmartMIM-216 Manual de usuario
9032680
SmartTrunk
User’s Guide
i
Notice
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.
© Copyright October 1998 by:
Cabletron Systems, Inc.
P.O. Box 5005
Rochester, NH 03867-5005
All Rights Reserved
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.
ii
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
iv
v
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
vi
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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