Bay Networks CLAM Manual

ISSUE 4.0 MAN-CLAM-BRIDGE-ADDENDUM

CLAM BRIDGE

ADDENDUM

Issue 4.0

photocopied, reproduced, translated or reduced to any electronic medium or machine-

readable form without the prior written permission of Bay Networks Inc.

The information contained in this manual is believed to be accurate. However, no

responsibility whatsoever is assumed by Bay Networks Inc. for its use, nor for any

infringements of patents or other rights of third parties resulting from its use.

All trade marks are acknowledged.

1996 Scorpion Logic Ltd. A Bay Networks company

MAN-CLAM-BRIDGE-ADDENDUM ISSUE 4.0

ADDENDUM

Page 1

1. INTRODUCTION

The purpose of this addendum is to document the changes introduced between

Release 3 and Release 4 software. This addendum should be read in conjunction

with the CLAM Bridge Reference Manual Issue 3.0 to provide a full description

of the configuration and operation of the CLAM Bridge.

2. REFERENCE

The new features that have been added to the bridge Release 4.xx software that

have resulted in management system screen changes are:

• support for the CLAM WAN option board

• non propagation of Banyan Vines routing packets to a ‘stub’ network

• static ARP for enhanced security

• restricted SAP learning mode for large Novell IPX networks

• enhanced TA configuration and information screens

• support for the integral U interface North American BRI ISDN TA

The sections listed below have been updated to reflect the changes to the

management screens.

• Port Management

• General Bridging Parameters

• Static ARP Configuration

• IPX SAP Filter Configuration

• ISDN TA Configuration

Information regarding the changes is detailed in the following pages.

ADDENDUM

Page 2

2.1 PORT MANAGEMENT

The port configuration screen displays a list of ports; LAN, WAN and ISDN that

have been detected by the unit. This screen is accessed by typing CO PO at the

command prompt.

N.CLAM.mmm SYSTEM NAME PORT CONFIGURATION

___________________________________________________________________________________

Page No. m of n

No. Name Type Phys. Rx(%) Tx(%) LZC(/) State

LAN1 LAN Port No. 1ETHERNET CSMA/CD 02.4 00.0 UP

ISDN1 TA Link 1BRIDGE TA ISDN 00.2 02.9 2.6 UP

ISDN2 TA Link 2 BRIDGE TA ISDN 58.7 12.6 3.8 UP

[WAN1 HDLC Link 1BRIDGE HDLC V.24 00.2 01.8 4.5 UP ]

EDIT - Edit Port TYPE -Change Port Type

___________________________________________________________________________________

^G - Main Menu

^L - Prev Menu

___________________________________________________________________________________

(co po) Enter command :

Figure 2.1 Ports List Screen

If a CLAM WAN is installed in the unit, it will be automatically detected and the

port will be displayed in addition to any other ports on the unit.

If a WAN port is available it should be configured with reference to one of the

following two sections 2.1.1 HDLC PORTS or 2.1.2 PPP PORTS.

ADDENDUM

Page 3

2.1.1 HDLC PORTS

N.CLAM.mmm SYSTEM NAME EDIT HDLC PORT

___________________________________________________________________________________

Port Number :WAN1 Demand Threshold : 50%

Port Name :HDLC Link 1 Demand Period : 10

STP Priority :128 Idle Threshold : 2%

Line Speed(bits/s):19200 Idle Period : 60

Compression :ENABLED Demand Priority : 0

Backup/Demand Mode:NONE Backup Priority : 0

Backup Bridge :002062009999 Backup Alert : ENABLED

Remote Unit Name :0923710254

___________________________________________________________________________________

^G - Main Menu

^E - Submit ^L - Prev Menu

___________________________________________________________________________________

Figure 2.2 HDLC Port Configuration Form

PORT

NUMBER The port number in the system. It is generated automatically

by the system and cannot be configured.

PORT NAME A name given to the port for ease of reference. It is not used

by the system, other than on management screens.

STP

PRIORITY Used by the Spanning Tree Algorithm, the path cost is used

to help calculate the unique root path through the network.

LINE SPEED

(BITS/S) This parameter should be set to the actual line speed at which

the interface is being clocked . Although the CLAM Bridge

does not generate clocks this parameter is used to configure

internal timers which optimise use of the link.

COMPRESS-

ION Data compression can increase the effective bandwidth of the

port typically between 2 and 8 times. The degree of

compression that can be achieved depends largely on the

format of the data being transferred and the speed of the link.

ADDENDUM

Page 4

DISABLED turns data compression off.

ENABLED allows the system to use its standard bandwidth

optimisation algorithm for compression. This should be used

on all links up to 256Kbps.

FAST should be used on links with speeds greater than 256

Kbps to maintain maximum throughput on the line. The

advantage of using compression depends on the data type and

line speed increases. You should monitor the effect of

turning compression on and off, particularly at line speeds

over 256Kbps.

BACKUP /

DEMAND

MODE

Specifies if Backup of this port and/or Bandwidth on

Demand is allowed when dial-up ports are available, e.g.

ISDN. Also specifies if EXPEDITED or NON-expedited

data will cause the system to dial up Backup and/or

Bandwidth on Demand when threshold values are reached

(see the following section for details of Expedited Protocols/

PROTOCOL PRIORITISATION).

NONE disables these options.

BACKUP allows the system to dial the Remote Unit Name

destination (see below) if the link fails.

DEMAND allows the system to dial up additional bandwidth

to support this link if the configured Demand Threshold

values are met (see below).

BOTH enables both BACKUP and DEMAND. If it is used,

you can set Backup Priority and Demand Priority (see

below).

EXP.DATA means that when Demand Threshold values are

met (see below), packets defined as EXPEDITEd in the Type

Filter Table will be sent by the first additional link dialled up.

ADDENDUM

Page 5

EXP+BKUP means that when Demand Threshold values are

met (see below), packets defined as EXPEDITEd in the Type

Filter Table will be sent by the first additional link dialled up.

It also allows the use of the BACKUP facility to dial the

Remote Unit Name destination (see below) if the usual link

fails.

NON-EXP.DATA means that when Demand Threshold

values are met (see below), packets defined as NON-

expedited in the Type Filter Table will be sent by the first

additional link dialled up.

NON-EXP+BKUP means that when Demand Threshold

values are met (see below), packets defined as NON-

expedited in the Type Filter Table will be sent by the first

additional link dialled up. It also allows the use of the

BACKUP facility to dial the Remote Unit Name destination

(see below) if the usual link fails.

REMOTE

UNIT NAME The name or ISDN number of the remote partner bridge,

unless the Backup/Demand Mode parameter is set to NONE.

Note: the name must be configured in the ISDN Numbers

configuration table.

BACKUP

BRIDGE Another bridge's dial-up ports may be used to BACKUP this

port. This provides 1-for-N backup of leased lines connected

to a number of bridges. The value specifies the MAC address

of the bridge used to place the backup call (which must be on

the same LAN).

Note: Bandwidth on Demand circuits can only be dialled up

from the same unit as the port requesting the additional

bandwidth. Dialup bandwidth by another bridge can only be

used for circuit backup purposes, i.e. when the original

circuit has failed.

ADDENDUM

Page 6

DEMAND

THRESHOLD Specifies the percentage loading on the link which must be

reached over the period of time in Demand Period (see

below) before dialled-up bandwidth is requested.

Each time this threshold is reached, additional bandwidth will

be requested. This means that a link can request multiple

connections to the same destination to add bandwidth.

Multicast and Broadcast frames are not included in loading

calculations, so additional bandwidth will not be dialled up

due to these frame types.

DEMAND

PERIOD The period (in seconds) over which bandwidth utilisation is

measured to determine whether the Demand Threshold has

been exceeded.

Over the Demand Period, more than Demand Threshold

percent of the link bandwidth must have been used before

additional bandwidth (if available) will be dialled up.

IDLE

THRESHOLD If the loading on a dialled-up bandwidth on demand

connection falls below this percentage, the additional

connection will be cleared.

Multicast and Broadcast frames are not included in loading

calculations, so connections will not be maintained if only

these frame types are present.

IDLE

PERIOD The period (in seconds) over which link loading is calculated

for comparison with the Idle Threshold. Over the Idle

Period, if less than Idle Threshold percent of the link

bandwidth has been used, the dialled-up link is cleared down.

An Idle Period that is too short may cause connections to be

dialled up and cleared before operation has stabilised, whilst

setting a value that is too high may leave the connection

established for longer than is needed. Therefore, careful

consideration should be given to the setting of this value.

ADDENDUM

Page 7

DEMAND

PRIORITY Dial-up connections can be used to provide bandwidth on

demand and backup of leased lines. This parameter

determines the priority of this port when using a dial-up

circuit for additional bandwidth.

Should this port require the use of a backup dial-up circuit

that is already in use, the Demand Priority will be compared

with the priority used by the port which is already using the

dial-up circuit. If the existing dial-up circuit is being used by

a higher priority request, the new request will be refused. If

it is lower, the dial-up circuit will be cleared and used for the

new request.

The original port may have requested the backup circuit for

backup or for additional bandwidth. Therefore, it is possible

to establish a priority hierarchy for ports which may be using

backup circuits for either reason. The higher the number, the

higher the priority.

BACKUP

PRIORITY Determines the priority of this port when using a dial-up

circuit for backup purposes. Operation is identical to that

described for Demand Priority.

BACKUP

ALERT Reserved for future use.

ADDENDUM

Page 8

PROTOCOL PRIORITISATION

Local Area Networks can support many different types of protocols, each with

different transmission characteristics and requirements. It is possible for one

protocol to adversely affect other protocols on the LAN by taking too much

bandwidth.

This problem is made worse by inserting a remote bridge link, due to the lower

speed of the link compared to the LANs at either end. One solution is to provide

extra bandwidth overall, but this rarely cures the problem as more and more

bandwidth is consumed by the bandwidth-hungry protocol. Another method is to

give one protocol (the Expedited Protocol) priority over the others, so that it can

transmit its packets without interference.

Protocol Prioritisation means that Expedited Protocols have priority over any

other protocols transported by the bridge. This ensures that one or more user data

streams are not affected by other data streams that take a lot of bandwidth. In

addition, Bandwidth on Demand and/or Backup can be allocated to either

EXPEDITED or NON-expedited (normal) data. Please see the following menu

screens and forms:

1. TYPE FILTERS (command: CONF BRID TYPE)

2. FILTER PARAMETERS (command: CONF BRID PARA)

3. PORT CONFIGURATION (command: CONF PORT EDIT).

• If only one leased circuit is available (without Bandwidth on Demand or

Backup), EXPEDITED data takes priority by about 3:1 over normal (NON-

expedited) data, i.e. for each normal packet that is sent, three EXPEDITED data

packets are sent.

• If two channels are available, the first carries normal data and the second carries

EXPEDITED data.

• If Bandwidth on Demand is enabled for EXPEDITED data, the Demand

Threshold applies to EXPEDITED data only. Only one ISDN channel can be

used for EXPEDITED data, no matter how the Demand Threshold parameters

are set up.

• If Bandwidth on Demand is enabled for normal data, the Demand Threshold

applies to normal data only. If normal data on the leased circuit is higher than

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