Bay Networks BayStack 400-ST1 Installation Manual

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Installing the BayStack 400-ST1 Cascade Module

Part No. 304433-A Rev 00 November 1998

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All rights rese rved.

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.

Statemen t of Con di tio ns

In the interest of improving internal design, opera tional function, and/or reliabi lity, 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 ) des cribed 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 interferenc e, in which case user s will be requir ed 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 Directiv e 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 en vironment, 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.

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Intr oduction

This guide provides pr ocedures 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 n ot 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 settin g 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

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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 Insta lling the 400-ST1 Cascade Module 16 Modifying an existing stack configuration 26 Upgrading the BayStack 450 Switch

Firmware

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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 th e BayStac k 400 -ST 1 C as cade Module).

BayStack 400-ST1 cascade module

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

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

Installing the BayStack 400-ST1 Cascade Module

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).

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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.

Note:

Unless otherwise specified, the terms “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.

Cascade A Out

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

Figure 2. Front Panel Components

Unit Select

Base

Cascade A In

BS0031A

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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 connecto r 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) det ermin es the base unit for the stack configuration (see “

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

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

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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

Cascade A In

Cascade A InUnit Select

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

Figure 3. Connecting Cascade Cables

BS0032A

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Base Unit Description

The base unit is a un i que 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 physic al ordering of the units within 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 un it 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 con figuration (up to 8 units) is reached.

If the base unit is ch anged to anoth er unit i n the stack, the ne w b ase uni t keep s it s or igi nal uni t number i n t he stack.

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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 Serie s Swit ch gu ide.

• Stack IP MAC address --- The stack 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.

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• Temporary Base Unit --- If an assigned base unit fails, the next unit in the stack order automatically becomes the new tempor ar y bas e unit. This change is indi cated by the Base LED on the temporary base unit’s LED display panel t urning o n (yellow).

The automatic base unit chang e 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 se ttings revert back to the settings configured before the unit became a member of the stack:

• IP address

• console password

• TELNET password

• SNMP community strings

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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 ar e associated with the b ase 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 th e next switch , which is assign ed as unit 2, and continue s until the last switch in the stack is assigne d as unit 8. The physical order of the switches is fr om bottom to top (unit 1 to unit 8).

Stack Down Configurations

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

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Unit 8

Unit 7

Unit 6

Unit 5

Unit 4

Unit 3

Unit 2

Unit 1

1 = Last unit 2 = Base unit

3 = Cascade cable (PN 303978-A) 4 = Cascade max-return cable (PN 303979-A)

Figure 4. Stack Up Configuration Example

BS0033A

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Unit 1

Unit 2

Unit 3

Unit 4

Unit 5

Unit 6

Unit 7

Unit 8

1 = Base unit 2 = Last unit

3 = Cascade cable (PN 303978-A) 4 = Cascade max-return cable (PN 303979-A)

BS0034A

Figure 5. Stack Down Configuration Example

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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 recom mend s that

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 throug h 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.

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Redundant Cascade Stacking Feature

BayStack 400-ST1 Cascade Modules allo w 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 o perational, without interruption.

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 automatically lo op their

internal s tack si 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 un its remain connected.

Although the example shown in Figure 6 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).

shows a failed

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Unit 1

Unit 2

Unit 3

Cascade A Out

Cascade A In

Unit 4

Unit 5

1 = Base unit 2 = Last unit

3 = Cascade cable (PN 303978-A) 4 = Cascade max-return cable (PN 303979-A)

BS0035A

Figure 6. Redundant Cascade Stacking Feature

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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 include s 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.

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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 thumbscrews and remove the filler

panel from the Cascade Module slot (Figure 7

1 = Filler panel 2 = Cascade module slot

BS0036A

Figure 7. Removing the Filler Panel

3. Insert the 400-ST1 Cascade Module into the

chassis slot taking car e to slide the module into the guides p rovided on th e chassis (Figure 8

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

Cascade A Out

Unit Select

ase

Cascade A In

BS0037A

Figure 8. Installing a 400-ST1 Cascade Module

4. Pr ess the module firmly into the chassis slot. Be

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

conf igured with the 400-ST1 Cascade Module.

7. Proceed to the next section “

Connecting Multiple Switch es” on page 19.

Install ing and

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Installing and Connecting Multiple Switches

The procedure to install and co nnect multiple switches is similar for tabletop, shelf, or standard 19-in ch 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 table top.

Refer to the Using the BayStack 450 10/100/1000 Serie s Swit ch guide for requirements and instructions

for installing the B a yStack 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.

Note:

Bay Networks recommends that you always configure the top unit in the stack as the base un it.

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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 th e base u nit.

Off

Cascade A Out

Unit Select

Base

Cascade A In

BS0038A

Figure 9. Setting the Unit Select Switch

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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).

Unit 1

Unit 2

Cascade A Out

Cascade A InUnit Select

Unit 3

Cascade A Out

Cascade A InUnit Select

Unit 4

Cascade A Out

Cascade A InUnit Select

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 Cable s

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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 ju st 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 303 979-A).

8. Be sure all cable connections to the cascade connectors are secur ed f irmly by the thumb screws on the cascade cable plugs.

9. Procee d to “

Connecting Power ” on page 23.

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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 unit 1.

The stack initializatio n sequence takes approximately 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.

Note:

Bay Networks recommends that you 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.

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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. Procee d to “

Verifying the Installation” following

this section.

Verifying the Installation

When installation is complete an d power is applied to the stack configuration, check to see that the following LED indicati ons are displayed on the switch LED 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 of f, 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.

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Cas

Pwr

Status

RPSU

Dwn

Base

1211

2423

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

BayStack

Cas

Pwr

Status

RPSU

450-24T Switch

Cas

Dwn

Base

BS0040A

Figure 11. Ve rifying the Installation

• The Base LED for the base unit o nly 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 v erify the LEDs. Refer to Using the BayStack 450 10/100/1000 Serie s Swit ch guide to set up the stack an d for detailed information abou t stacking, including troubleshootin g.

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Modifying an Existing Stack Configuration

This section provides examples of how to modify an existing stack configuration. The examples assume the stack configur ation is operation al 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 completion. Notify the connected stations that there will be a short disruption of network services before renumbering the stack.

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

This section include s the following topics:

• Assigning a new base unit to the stack

• Adding units to the stack

• Removing/replacing units from the stack

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Assigning a New Base Unit to the Stack

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

Note:

Bay Networks recommends that you always configure the top unit in the stack as the base un it.

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 posi tion.

3. Renumber the Stack.

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

renumber the stack configurati on .

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Adding Units to the Stack

This sectio n des cri b es how to add one or more units to t he middle of a stack or to the end of a stack.

Note:

Refer to Using the BayStack 450

10/100/100 0 Series S witc h for in formation about

installing units on a tabletop or in a standa rd 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 ne w units are numbered as unit 5 and unit 6 because they are additions to an existing 4 unit st ack.

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

Leave the other end of the cascade cable connected to the Cascade A Out connector at unit 2.

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

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

Unit 1

Unit 2

Unit 3

Unit 4

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

BS0041A

Figure 12. Adding to Middle of Stack

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

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

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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 Conf iguration” in the Using t he 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 ne w units are numbered as unit 5 and unit 6 because they are additions to the end of an existing 4 unit stack.

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Cascade Module

Unit 1

Unit 2

Unit 3

Unit 4

1 = Base unit

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

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.

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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-retur n cable fr om 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 Conf iguration” in the Using t he 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.

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Removing/Replacing Adjacent Units

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

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

Cascade A Out

Unit 1

Unit 2

Unit 3

Unit 4

Cascade A In

1 = Base unit 2 = Last unit

Figure 14. Removing Adjacent Units

Unit 5

Unit 6

BS0043A

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

3. Remove the units (units 3 a nd 4) and insta ll 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 Conf iguration” in the Using t he BayStack 450 10/100/1000 Series Switch guide.

Removing/Replacing Nonadjacent Units

Note: Remove and replace the units individually

to avoid segmenting th e 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 casc ade cable from the Cascade A Out connector at unit 3.

3. Remove the u n it (unit 3) and inst all the replacement unit as required.

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

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5. Repeat Steps 1 to 4 for unit 5.

Unit 1

Unit 2

Unit 3

Unit 4

Unit 5

Unit 6

1 = Base unit 2 = Last unit

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 Conf iguration” in the Using t he BayStack 450 10/100/1000 Series Switch guide.

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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:

software version V1.1.0, you must download

images

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

When upgrading the firmware image to

two

(the

boot code image

and the

before

agent image

the agent image is

) for

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

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3. After the BayStack 450 boot code image is downloaded , click on Version 1. 1.0 at the Ba yStack 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 settin g 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.

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• 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 Ph y set to Righ t.

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 Serie s Swit ch gu ide.