Bay Technical Associates BayStack 400-ST1 User Manual

Installing the
BayStack 400-ST1
Cascade Module

Part No. 304433-A Rev 00
November 1998

© 1998 by Bay Networks, Inc.

All rights reserved.

Trademarks

Bay Networks is a registered trademark and BayStack is a trademark of Bay
Networks, Inc. All other trademarks and registered trademarks are property of their
respective owners.

Statement of Conditio ns

In the interest of improving internal design, operational function, and/or re liability,
Bay Networks, Inc. reserves the right to make changes to the products described in
this document without notice.

Bay Networks, Inc. does not assume any liability that may occur due to the use or
application of the product(s) or circuit layout(s) described herein.

Federal Communications Commission (FCC) Compliance Notice:
Radio Frequency Notice

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 generates,
uses, and can radiate radio frequency energy. If it is not installed and used in
accordance with the instruction manual, it may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to cause
harmful interference, in which case users will be required to take whatever
measures may be necessary to correct the interference at their own expense.

EN 55 022 Declaration of Conformance (UPDATE THIS FOR 400-ST1)

This is to certify that the Bay Networks BayStack 400-ST1 Cascade Module are
shielded against the generation of radio interference in accordance with the
application of Council Directive 89/336/EEC, Article 4a. Conformity is declared by
the application of EN 55 022 Class A (CISPR 22).

Warning: This device is a Class A product. In a domestic environment, this product
may cause radio interference, in which case, the user may be required to take
appropriate measures.

These products conform to the provisions of Council Directive 89/336/EEC and
72/23/EEC. The Declaration of Conformity is available on the Bay Networks World
Wide Web site at www.baynetworks.com.

Introduction

This guide provides procedures for installing the BayStack
400-ST1 Cascade Modules into supported Bay Networks
BayStack 450 switches that are configured with BayStack
450 software version V1.1.0 or later. You can determine
the software version of your switches by accessing the
System Characteristics screen for each switch.

Note:

BayStack 400-ST1 Cascade Module

The

will not oper ate with BayStack 450 switches that
are configured with BayStack 450 software
versions earlier than version V1.1.0.

If you need to upgrade your BayStack 450 switches, refer
to “

Upgrading the BayStack 450 Switch Firmware” on

page 36

of this guide. You must upgrade the switch before

installing the BayStack 400-ST1 Cascade Module.
If you are upgrading your BayStack 450 switches, be sure

to obtain the latest version of the Using the BayStack 450
10/100/1000 Series Switch guide. That guide provides
instructions for setting up your stack configuration after
you install the 400-ST1 Cascade Modules.

You can obtain the latest updates to your product
documentation, including release notes, by visiting the
Bay Networks Web site at the following location:

www.support.baynetworks.com/library/tpubs

1

Find the Bay Networks product for which you need
documentation. Then locate the specific category and
model or version for your hardware or software product.

Using Adobe Acrobat Reader, you can open the manuals
and release notes, search for the sections you need, and
print them on most standard printers. You can download
Acrobat Reader free from the Adobe Systems Web site,

www.adobe.com.

This guide also describes how to connect 400-ST1
Cascade Modules to create a stack of (up to eight)
BayStack 450 switches, and how to modify existing stack
configurations.

For information about: Go to page:

The contents of the shipping box 3
The 400-ST1 front panel components 4
The base unit 7
Stack configurations 10
The redundant cascade stacking feature 14
Installing the 400-ST1 Cascade Module 16
Modifying an existing stack configuration 26
Upgrading the BayStack 450 Switch

Firmware

36

2

Contents of Shipment

Each BayStack 400-ST1 shipment includes the following
items (Figure 1

):

• One BayStack 400-ST1 Cascade Module

• One .30 meter (12 inch) cascade cable; part number
303978-A.

• This guide (Installing the BaySta ck 400-ST1 Cascade
Module).

BayStack 400-ST1
cascade module

0.30 m (12 in.) cascade
cable (PN 303978-A)

Installing the BayStack 400-ST1
Cascade Module

Optional:
1 m (39.27 in.)
cascade max-return
cable (PN 303979-A)

BS0030A

Figure 1. Contents of Shipment

For stacking three or more units (maximum 8 units per
stack), order the optional 1 meter (39.27 inch) cascade
max-return cable (Bay Networks Order No. AL2018001).

3

If any items are missing or damaged, contact the sales
agent or the customer service representative from whom
you purchased the BayStack 400-ST1 cascade module.
You will need a Phillips screwdriver for the installation.

Unless otherwise specified, the terms

Note:

“switch” and “unit” are used interchangeably in
this guide.

BayStack 400-ST1 Front Panel Components

The front-panel components of the BayStack 400-ST1
Cascade Module are shown in Figure 2

. Component

descriptions fo llow the figure.

1

Cascade A Out

2

1 = Blank connectors (unused)
2 = Cascade A Out connector
3 = Unit Select switch
4 = Cascade A In connector

Unit Select

3

Base

Cascade A In

Figure 2. Front Panel Components

4

4

BS0031A

Cascade A Out Connector

Provides an attachment point for connecting this unit to
another unit via the cascade cable. A return cable from
another unit’s Cascade A Out connector to this unit’s
Cascade A In connector completes the stack connection
(see the example shown in Figure 3

Note: For stacking three or more units

).

(maximum 8 units per stack), order the optional
1 meter (39.27 inch) cascade max-return cable
(Bay Networks Order No. AL2018001).

Unit Select Switch

The Unit Select switch (up = Base) determines the base
unit for the stack configuration (see “

Base Unit
Description” on page 7). The Unit Select switch status is

displayed on the BayStack 450 LE D display panel (see the
Using the BayStack 450 10/100/1000 Series Switch guide
for details). When in the Base (up) position, all other Unit
Select switches in the stack configuration must be set to
Off (down).

5

Cascade A In Connector

Provides an attachment point for accepting a cascade cable
connection from an adjacent unit in the stack. A return
cable from this unit’s Cascade A Out connector to the
adjacent unit’s Cascade A In connector completes the
stack connection (see the example shown in Figure 3

).

Cascade A Out

Unit 1

Cascade A Out

Unit 2

Cascade A Out

1 = Base unit
2 = 303978-A cascade cable
3 = 303978-A cascade cable (used for return)

3

Cascade A In

Cascade A InUnit Select

Cascade A InUnit Select

Figure 3. Connecting Cascade Cables

6

1

2

BS0032A

Base Unit Description

The base unit is a unique stack un it that can b e selected by
the Unit Select switch on the front-panel of the 400-ST1
cascade module. One unit in the stack configuration must
be assigned as the base unit; all other units in the s tack
must have their Unit Select switch set to Off (see “

Unit
Select Switch” on page 5). Any single unit in the stack can

be assigned as the base unit.
The physical ordering of all of the other units in the stack

are determined by the position of the base unit within the
stack. This is important for management applications that
view the physical orde ring of the units wi thin the stack.

Some characteristics of the base unit are:

•

Initial installation

--- during the initial installation of
the stack, the software automatically determines the
physical order of all units in the stack according to the
position of the base unit within the stack.

For example, when the stack is powered up, the base
unit becomes unit 1 and the unit that the base unit
connects to (via the Cascade A Out cable) becomes
unit 2 (and the next unit is unit 3 and so on), until the
maximum stack configuration (up to 8 units) is
reached.

If the base unit is changed to anot her unit in the s tack,
the new base unit k eeps its orig inal un it num ber in the
stack.

7

Note:

You can renumber the units when you
perform the initial setup of the stack as described
in the Using the BayStack 450 10/100/1000
Series Switch guide.

• Stack IP MAC address --- The s tack IP MAC address is
automatically assigned during the stack initialization:

The base unit’s MAC address, with a software offset,
is used for the stack IP MAC address.

For example, if the base unit’s MAC address is:
00-00-82-99-44-00
and the Stack software offset is: 1F
then the Stack IP MAC address becomes:
00-00-82-99-44-1F
If another unit in the stack is assigned as the base unit,

the MAC address of the new base unit (with offset)
now applies to the stack configuration. The original
stack IP address still applies to the new base unit.

8

• T emporary Base Unit --- If an assigned base unit fails,
the next unit in the stack order automatically becomes
the new temporary b ase unit . This change is ind icated
by the Base LED on the temporary base unit’s LED
display panel t urning on (yellow).

The automatic base unit change to the next unit in the
stack order is a temporary safeguard which allows
you time to replace the failed unit, or reassign the
temporary base unit as the new base unit.

Note:

If you do not reassign the temporary base
unit as the new base unit, and the temporary base
unit fails, the automatic failover to another
temporary base unit will not occur.

Set the Unit Select switch on the temporary base unit
to Base (up =Base) to reassign it as the new base unit.

•

Removing a unit from the stack--- if a unit is removed

from the stack (therefore operating in standalone
mode), the following switch configuration settings
revert back to the settings configured before the unit
became a member of the stack:

• IP address

• console password

• TELNET password

• SNMP community strings

9

Stack Configurations

As shown in Figure 4

, the cascade connectors and cables
on the 400-ST1 front-panel provide the ability to stack up
to eight BayStack switches. With 400-4TX MDAs
installed in each switch, the stack can accommodate a
maximum of 224 switch ports.

Because stack parameters are associated with the base unit
(see “

Base Unit Description” on page 7), the physical

stack order depends on the base unit’s position and
whether the stack is configured stack up or stack down.

Stack Up Configurations

In Figure 4, data flows from the base unit (unit 1) to the
next switch, which is assigned as unit 2, and continues
until the last switch in the stack is assign e d as unit 8. The
physical order of the switches is from bottom to top (unit 1
to unit 8).

Stack Down Configurations

In Figure 5, data flows from the base unit (unit 1) to the
next switch, which is assigned as unit 2, and continues
until the last switch in the stack is assign e d as unit 8. The
physical order of the switches is from top to bottom (unit 1
to unit 8).

10

t

u

1

O

Unit 8

Unit 7

Unit 6

Unit 5

Unit 4

Unit 3

Unit 2

2

1 = Last unit
2 = Base unit
3 = Cascade cable (PN 303978-A)
4 = Cascade max-return cable (PN 303979-A)

3

Unit 1

I

n

4

Figure 4. Stack Up Configuration Example

11

BS0033A

1

2

O

1 = Base unit
2 = Last unit
3 = Cascade cable (PN 303978-A)
4 = Cascade max-return cable (PN 303979-A)

3

Unit 1

n

I

Unit 2

Unit 3

Unit 4

Unit 5

Unit 6

Unit 7

Unit 8

u

t

4

BS0034A

Figure 5. Stack Down Configuration Example

12

Certain network management station (NMS) applications
assume a stack down configuration for the graphical user
interface (GUI) that represents the stack (see Figure 5

page 12

). For this reason, Bay Networks recommends that

on

you always configure the top unit in the stack as the base
unit.

In any stack configuration, the following applies:

• The entire stack powers up as a single logical unit

within 30 seconds after the base unit initialization.

• You can attach an RS-232 communications cable to

the Console/Comm port of any switch in the stack.

• You can downline upgrade the entire stack from any

switch in the stack.

• You can access and manage the stack using a

TELNET connection or any generic SNMP
management tool through any switch port that is part
of the stack configuration.

• When stacking three or more switches, the longer

(1-meter) cascade max-return cable (PN 303979-A) is
used to complete the link from the last unit in the
stack to the base unit.

13

Redundant Cascade Stacking Feature

BayStack 400-ST1 Cascade Modules allow you to connect
up to 8 units into a redundant cascade stack. If any single
unit fails or if a cable is accidently disconnected, other
units in the stack remain operational, without inte rruption.

Figure 6

shows an example of how a stack configuration
reacts to a failed or powered down unit in the stack
configuration:

a. As shown in Figure 6

unit 3 becomes

nonoperational.

This can be the result of a failed unit, or simply
because the unit was powered down.

b. Unit 2 and unit 4, directly upstream and

downstream from unit 3, sense the loss of link
signals from unit 3.

c. Unit 2 and unit 4 automati cally loop their

internal stack s i gnals (A and B).

The Cas Up LED for unit 2 and the Cas Dwn
LED for unit 4 turn on (yellow) to indicate the
stack signals are looped.

d. The remaining stack units remain connected.

Although the example shown in Figure 6

shows a failed
unit causing the stack to loop signals at the points of
failure (A and B), the system reacts the same way if a
cable is removed (either deliberately or accidently).

14

Cascade A Out

1

Unit 1

Unit 2

Unit 3

Unit 4

Unit 5

2

1 = Base unit
2 = Last unit
3 = Cascade cable (PN 303978-A)
4 = Cascade max-return cable (PN 303979-A)

3

Cascade A In

A

B

4

Figure 6. Redundant Cascade Stacking Feature

BS0035A

15

Installation

This section describes how to connect up to eight
BayStack 10/100/1000 Series switches into a redundant
stack. The switch stack can consist of any combination of
BayStack 450-24T and BayStack 450-12T switch models.

Before installing your equipment, review the previous
sections of this guide.

Note: For stacking three or more units

(maximum 8 units per stack), order the optional
1 meter (39.27 inch) cascade max-return cable
(Bay Networks Order No. AL2018001).

This section includes the following topics:

• Installing the 400-ST1 Cascade Module

• Installing and connecting multiple switches

• Connecting power

• Verifying the installation
After verifying the installation as described in

“

Verifying the Installation” on page 24 of this guide, refer

to the Using the BayStack 450 10/100/1000 Series Switch
guide to set up the stack and customize the stack
configuration according to your system requirements.

16

Installing the 400-ST1 Cascade Module

The Cascade Module slot on the BayStack 450 switch can
accommodate a single 400-ST1 Cascade Module.

To install a 400-ST1 Cascade Module into the Cascade
Module slot, follow these steps:

1. Unplug the AC power cord from the back of the

switch.

2. Loosen the thum bscrews and remove the filler

panel from the Cascade Module slot (Figure 7

2

1 = Filler panel
2 = Cascade module slot

Figure 7. Removing the Filler Panel

1

).

BS0036A

3. Ins ert the 400-ST1 Cascade Module into the

chassis slot taking care to slide the module into the
guides provided on the chassis (Figure 8

17

).

Caution: Be sure that the module slides in on the
guides provided. Failure to align the guides could
result in bent and broken pins

Cascade A Out

Unit Select

B
ase

Cascade A In

BS0037A

Figure 8. Installing a 400-ST1 Cascade Module

4. Press the module firmly into the chassis slot . B e

sure that the module is fully seated into the mating
connector.

5. Secure the module in the chassis by tightening the

thumb screws on the module front panel.

6. Repeat Steps 1 to 5 for each switch that is to be

configured with the 400-ST1 Cascade Module.

7. Proceed to the next section “

Installing and

Connecting Multiple Switches” on page 19.

18

Installing and Connecting Multiple Switches

The procedure to install and connect multiple switches is
similar for tabletop, shelf, or standard 19-inch utility rack
installations.

To install multiple switches , follow these steps:

1. Install one unit at a time in the rack or on the shelf

or tabletop.

Refer to the Using the BayStack 450 10/100/1000
Series Switch guide for requirements and instructions

for installing the BayStack 450 switch on a tabletop,
shelf, or in a standard 19-inch utility rack.

2. Disconnect the AC power cords (if previously

connected) from the units you are configuring in
the stack.

3. Determine the stack order configuration, stack up

or stack down, you are installing (refer to “

Stack

Configurations” on page 10).

4. Position the unit you want to be the base unit at the

top (or bottom) of the stack.

Bay Networks recommends that you

Note:

always configure the top unit in the stack as the
base unit.

19

5. Set the Unit Select switch for the base unit to the

Base (up = Base) position ( Figu re 9

).

6. Set the Unit Select switch for all other units in the

stack to the Off (down = Off) position

Only one unit in the stack can be the base unit.

Off

Cascade A Out

Unit Select

Base

Cascade A In

Figure 9. Setting the Unit Select Switch

20

BS0038A

7. Connect the units using the supplied cascade

cables (Figure 10

).

a. Connect one end of a cascade cable to the

Cascade A Out connector on the Base Unit
(unit 1).

1

Unit 1

Cascade A Out

Cascade A InUnit Select

Unit 2

Cascade A Out

Cascade A InUnit Select

3

Unit 3

Cascade A Out

Cascade A InUnit Select

2

Unit 4

Cascade A Out

Cascade A InUnit Select

4

1 = Base unit
2 = Last unit
3 = Cascade cable (PN 303978-A)
4 = Cascade max-return cable (PN 303979-A)

BS0039A

Figure 10. Installing Cascade Cables

21

b. Connect the other end of the cascade cable to

the cascade A In connector on the unit just
below the base unit (unit 2), or just above the
base unit if cascading up the stack.

c. Continue attaching the cascade cables until

the last unit is configured.

A maximum of eight units can be configured per
stack.

d. At the last unit in the stack, connect one end of

a cascade max-return cable to the Cascade A
Out connector. Connect the other end of the
cascade max-return cable to the cascade A In
connector on the base unit.

When stacking 3 or more units, the (optional ) 1
meter (39.27 inch) cascade max-return cable is
required (Bay Networks P art Number 303979 -A).

8. Be sure all cable connections to the cascade

connectors are secured f irmly by the thumb screws
on the cascade cable plugs.

9. Proceed to “

Connecting Power” on page 23.

22

Connecting Power

When the stack is initially powered up, the software
automatically assigns unit numbers to the units (the
individual switches in the stack). The unit numbers
correspond to the physical stack power up/initialization
sequence, beginning with the base unit as u nit 1.

The stack initialization sequence takes appro ximately 30
seconds for completion. If any switch in the stack
configuration does not power up or initialize within 15
seconds, it is assigned a unit number that may be out of
sequence with the stacking order.

If this happens, you can renumber the units when you
perform the initial setup of the stack as described in the
Using the BayStack 450 10/100/1000 Series Switch guide.

Bay Networks recommends that you

Note:

connect all of the switch AC power cords to one
or two AC power strips that c an apply power to
all of the switches simultaneously.

Power up the stack configuration as follows:

1. Plug the AC power cord, for each switch in the

stack configuration, into the AC power receptacle
on each switch back panel.

2. Plug the other ends of the AC power cords into a

grounded AC power strip.

23

One or two AC power strips may be required to
accommodate the quantity of switches in the stack.

3. Apply power to the AC power strip.

Set the AC power strip On/Off switch to On (or
connect the AC power strip to a grounded AC power
outlet).

4. Proceed to “

Verifying the Installation” following

this section.

V erifying the Installation

When installation is complete and power is applied to the
stack configuration, check to see that the following LED
indications are displayed on the switch L ED display
panels for all units configured in the stack (Figure 11

):

• The Pwr LED and Status LED for all units in the

stack are all on (green).
If the Pwr or Status LED for any unit in the stack is

off, or bl inking, r efer to the t roublesho oting chapt er in
the Using the BayStack 450 10/100/1000 Series
Switch guide.

• The Cas Up/Dwn LEDs for all units in the stack are

all on (green).
If the Cas Up/Dwn LED for any unit in the stack is

off, or yellow, check the cable connections to and
from the 400-ST1 cascade connectors.

24

Cas

Pwr

Up

Status

Dwn

RPSU

1

Base

1211

BayStack

2423

Cas

Pwr

Status

RPSU

450-24T Switch

Cas

Up

Dwn

Base

2

1 = Base unit only
2 = All other units in stack

BS0040A

Figure 11. Verifying the Installation

• The Base LED for the base unit only is on.

If one (or more) Base LEDs are blinking, no unit (or
more than one unit) is configured as the base unit.

If the LEDs on any of the units in the stack are not as
shown in Figure 11

, cycle the power to the stack and verify
the LEDs. Refer to Using the BayStack 450 10/100/1000
Series Switch guide to set up the stack and for detailed
information about stacking, including troubleshooting.

25

Modifying an Existing Stack Configuration

This section provides examples of how to modify an
existing stack configuration. The examples assume the
stack configuration is operational with connected stations.
Always notify the attached stations that there may be a
temporary disruption of the network services before you
begin the modification.

To maintain the unit numbering within the stack, Bay
Networks recommends that you renumber the entire stack
after any modification involving configuration changes.

Note: Renumbering causes the entire stack to be

reset with the current configuration settings. The
Reset can take up to 30 seconds for completi on.
Notify the connected stations that there will be a
short disruption of network services before
renumbering the stack.

See the Using the BayStack 450 10/100 /1000 Series
Switch guide for more information about renumbering.

This section includes the following topics:

• Assigning a new base unit to the stack

• Adding units to the stack

• Removing/replacing units from the stack

26

Assigning a New Base Unit to the Stack

To assign a new base unit to the stack, complete the
following steps:

Bay Networks recommends that you

Note:

always configure the top unit in the stack as the
base unit.

1. Set the Unit Select switch on the original base unit

to the Off position.

See Figure 9

on page 20 for details about the Unit

Select switch.

2. Set the Unit Select switch on the new base unit to

the Base position.

3. Renumber the Stack.

See the Using the BayStack 450 10/100 /1000 Series
Switch guide for detailed information on how to

renumber the stack config urat ion .

27

Adding Units to the Stack

This section describe s how to add one or more units to the
middle of a stack or to the end of a stack.

Refer to Using the BayStack 450

Note:

10/100/1000 Series S witc h fo r inform ation abou t
installing units on a tabletop or in a s t andard
19-inch utility rack.

Adding Units to the Middle of a Stack

To add one or more units to the middle of a stack,
complete the following steps:

1. Determine the position of the new units in the

existing stack (Figure 12

).

For example, the shaded units (units 5 and 6) in

Figure 12

show two new units to be added to the
stack. The new units are numbered as unit 5 and unit 6
because they are additions to an existing 4 unit stack.

2. Disconnect the cascade cable from the Cascade A
In connector at unit 3.

Leave the other end o f the cascade cable co nnected to
the Cascade A Out connector at unit 2.

3. For 19-inch rack configurations, move the units
two spaces lower in the rack.

28

For tabletop configurations, temporarily move units 1
and 2 to allow space for units 5 and 6.

1

2

1 = Base unit
2 = Last unit
3 = Cascade cable (PN 303978-A)
4 = Cascade max-return cable (PN 303979-A)

O

3

Unit 1

I

n

Unit 2

Unit 3

Unit 4

u

t

4

BS0041A

Figure 12. Adding to Middle of Stack

4. Add the new units to t h e desired locati on.

For tabletop configurations, replace units 1 and 2
(temporarily moved in Step 4).

29

5. Reconnect the cascade cable from unit 2 to the
Cascade A In connector of (new) unit 5.

6. Connect a cascade cable from the Cascade A Out
connector of unit 5 to the Cascade A In connector
of unit 6.

7. Connect a cascade cable from the Cascade A Out
connector of unit 6 to the Cascade A In connector
of unit 3.

8. Renumber the order of the units for the new stack
configuration (if desired).

You can renumber the unit numbers as described in
“Setting Up the Stack Configuration” in the Us ing the
BayStack 450 10/100/1000 Series Switch guide.

Adding Units to the End of a Stack

To add one or more units to the end of a stack,
complete the following steps:

1. Determine the position of the new units in the
existing stack (Figure 13

).

For example, the shaded units (units 5 and 6) in

Figure 13

show the two new units to be added to the
stack. The new units are numbered as unit 5 and unit 6
because they are additions to the end of an existing 4
unit stack.

30

1

2

1 = Base unit
2 = Last unit
3 = Cascade cable (PN 303978-A)

Cascade Module

Cascade Module

Cascade Module

Cascade Module

Cascade Module

Cascade Module

3

Unit 1

I

n

Unit 2

Unit 3

Unit 4

O

u

t

4

4 = Cascade max- return cable (PN 303979-A)

BS0042A

Figure 13. Adding to End of Stack

2. Disconnect the cascade max-return cable (item 4)
from the Cascade A Out connector at unit 4.

Leave the other end of the cascade max-return cable
connected to the Cascade A In connector at unit 1.

3. Add the new units (units 5 and 6) to the end of the
stack configuration.

31

4. Connect a cascade cable from the Cascade A Out
connector of unit 4 to the Cascade A In connector
of unit 5.

5. Connect a cascade cable from the Cascade A Out
connector of unit 5 to the Cascade A In connector
of unit 6.

6. Reconnect the cascade max-return cable fro m unit
1 to the Cascade A Out connector of unit 6.

7. Renumber the order of the units for the new stack
configuration (if desired).

You can renumber the unit numbers as described in
“Setting Up the Stack Configuration” in the Us ing the
BayStack 450 10/100/1000 Series Switch guide.

Removing/Replacing Units from the Stack

This section describes how to remove and/or replace units
in an operating stack.

Because the Redundant Cascade Stacking feature allows
signals to loopback at a single point of failure, adjacent
contiguous cabled units can be removed and replaced as a
single unit from the stack.

For more information about the Redundant Cascade
Stacking feature see “

Redundant Cascade Stacking

Feature” on page 14.

32

Removing/Replacing Adjacent Units

To remove/replace adjacent units from an operating stack,
complete the following steps (see Figure 14

):

1. Remove the cascade cable from the Cascade A Out
connector at unit 2.

1

Cascade A Out

Cascade A In

2

1 = Base unit
2 = Last unit

O

u

t

Figure 14. Removing Adjacent Units

33

Unit 1

I

n

Unit 2

Unit 3

Unit 4

Unit 5

Unit 6

BS0043A

2. Remove the cascade cable from the Cascade A In
connector at unit 5.

3. Remove the units (units 3 and 4) and install
replacement units as required.

4. Renumber the order of the units for the new stack
configuration (if desired).

You can renumber the unit numbers as described in
“Setting Up the Stack Configuration” in the Us ing the
BayStack 450 10/100/1000 Series Switch guide.

Removing/Replacing Nonadjacent Units

Note: Remove and replace the units individually

to avoid segmenting the stack configuration.

To remove/replace nonadjacent units from an operating
stack, complete the following steps (see Figure 15

):

1. Remove the cascade cable from the Cascade A In
connector at unit 3.

2. Remove the cascade cable from the Cascade A Out
connector at unit 3.

3. Remove the unit (unit 3) and install the
replacement unit as required.

4. Reconnect the casc ade cables (removed in Steps 1
and 2) to unit 3.

34

5. Repeat Steps 1 to 4 for unit 5.

1

2

1 = Base unit
2 = Last unit

Unit 1

I

n

Unit 2

Unit 3

Unit 4

Unit 5

Unit 6

O

u

t

BS0044A

Figure 15. Removing Nonadjacent Units

6. Renumber the order of the units for the new stack
configuration (if desired).

You can renumber the unit numbers as described in
“Setting Up the Stack Configuration” in the Us ing the
BayStack 450 10/100/1000 Series Switch guide.

35

Upgrading the BayStack 450 Switch Firmware

The BayStack 450 switch firmware provides a code load
facility that allows you to upgrade the firmware image
over any switch port, including any MDA ports.

You must upgrade the BayStack 450 switch firmware
image before you install the BayStack 400-ST1 Cascade
Module.

Note:

When upgrading the firmware image to

software version V1.1.0, you must download

images

proper operation of the switch. The new boot code
image must be downloaded
downloaded.

boot code image

(the

and the

before

agent image

the agent image is

Accessing the Firmware Images

You can access the firmware image files directly on the
World Wide Web, as follows:

1. Go to support.baynetworks.com/software/ethernet/
baystack_450.html

2. Under the Operational Software heading, click on
Version 1.1.0 at the BayStack 450 boot code link.

Follow the prompts to download the BayStack 450
boot code image. The boot code image filename is

b4501101.img

two

) for

36

3. After the BayStack 450 boot code image is
downloaded, click on Vers ion 1.1.0 at the BayS tack
450 agent link.

Follow the prompts to download the BayStack 450
agent image. The agent image filename is

b4501102.img

Be sure to download the BayStack 450 boot code image
first, then download the BayStack 450 agent image.

Accessing the Latest Documentation

If you are upgrading your BayStack 450 switches, be sure
to obtain the latest version of the Using the BayStack 450
10/100/1000 Series Switch guide. This guide provides
instructions for setting up your stack configuration after
you install the 400-ST1 Cascade Modules.

You can obtain the latest updates to your product
documentation, including release notes, by visiting the
Bay Networks Web site at the following location:

www.support.baynetworks.com/library/tpubs

Upgrade Restrictions

The following restrictions apply when upgrading the
switch firmware:

• The firmware cannot be upgraded through a port that
is configured for tagged traffic.

37

• The port connection to the load host cannot be
through a MultiLink Trunk.

• During the load process, the ports are configured as
follows:

• Twisted-pair ports: autonegotiation enabled.

• Fiber optic ports: 100 Mb/s, half-duplex.

• Gigabit MDA ports: autonegotiation disabled,

Preferred Phy set to Right.

For detailed information about downloading a new
software image, see “Chapter 3, “Using the Console
Interface,” in the Using the BayStack 450 10/100/1000
Series Switch guide.

38