Installing the BayStack 400-ST1 Cascade Module Part No.
© 2000 by Nortel Networks, Inc. All rights reserved. Printed in the USA. August 2000. Trademarks Nortel Networks and BayStack are trademarks of Nortel Networks, Inc. All other trademarks and registered trademarks are the property of their respective owners. Statement of Conditions In the interest of improving internal design, operational function, and/or reliability, Nortel Networks, Inc. reserves the right to make changes to the products described in this document without notice. Nortel Networks, Inc.
Introduction This guide shows how to install BayStack™ 400-ST1 Cascade Modules into the following supported switches1: • Nortel Networks Business Policy Switch 2000™ • BayStack 450 Switch • BayStack 410-24T Switch You can create a mixed stack of supported switches, but certain restrictions apply (Figure 1).
As shown in Figure 1 on page 1, in a mixed stack configuration, the BayStack 450 and 410-24T switches must use compatible but device-specific software versions to operate with the Business Policy Switch. You must ensure that the Interoperability Software Version Numbers (ISVN) are identical. That is, the ISVN for the BayStack 450 and 410-24T must be the same as the ISVN for the Business Policy Switch. If the numbers are different, only the units that have the same ISVN as the base unit will form a stack.
You can obtain the latest updates to your product documentation, including release notes, by visiting the Nortel Networks Web site at the following location: www.support.baynetworks.com/library/tpubs Find the Nortel 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.
Contents of Shipment Your BayStack 400-ST1 shipment includes the following items (Figure 2): 1 AL2033010 2 3 4 Optional Cables BS0030B Figure 2. Contents of Shipment Item Description Part Number Order Number 1 BayStack 400-ST1 Cascade Module -- AL20330101 -- .5 meter (18 in.) cascade cable 308085-A -- -- Installing the BayStack 400-ST1 Cascade Module 304433-B -- 2 Optional (additional) .5 meter (18 in.) cascade cable 308085-A AL2018002 3 Optional 1 meter (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. 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 3. Component descriptions follow the figure.
Cascade A Out Connector Provides an attachment point for connecting this unit to another unit via the cascade cable. A cascade 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 4). Note: For stacking three or more units, order the optional 1 meter (3.28 ft) or 3 meter (9.84 ft) cascade return cable (Figure 2).
Cascade A In Cascade A Out 1 Unit 1 Cascade A Out Unit Select Cascade A In Unit 2 Cascade A Out Unit Select Cascade A In 1 = Base unit 3 2 = 303978-A cascade cable 3 = 303978-A cascade cable (used for return) 2 BS0032A Figure 4.
Base Unit The base unit is a unique unit that can be selected by the Unit Select switch on the front panel of the 400-ST1 cascade module (see “Unit Select Switch” on page 6). One unit must be assigned as the base unit; all other units must have their Unit Select switch set to Off.
• 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 there is only one Business Policy Switch unit in your mixed stack configuration, and it fails, the next upstream BayStack 450 Switch unit will become the temporary base unit and will continue stack operation. The base unit change is indicated by the Base LED on the temporary base unit’s LED display panel turning on (yellow). • -- The automatic failover to a temporary base unit is a temporary safeguard only.
• Stack MAC address -- The stack MAC address is automatically assigned during the stack initialization. The base unit’s MAC address, with an offset, is used for the stack MAC address. For example, if the base unit’s MAC address is: 00-00-82-99-44-00 and the offset is: 1F then the stack 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.
Stack Configurations As shown in Figure 5, the cascade connectors and cables on the 400-ST1 front panel provide the ability to stack up to eight switches. With 400-4TX media dependent adapters (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” on page 8), the physical stack order depends on the base unit’s position and whether the stack is configured stack up or stack down.
t Ou 1 Unit 8 Unit 7 Unit 6 Unit 5 Unit 4 Unit 3 Unit 2 Unit 1 2 In 1 = Last unit 2 = Base unit 3 3 = Cascade cable (PN 303978-A) 4 = Cascade max-return cable (PN 303979-A) 4 BS0033A Figure 5.
Stack Down Configurations In Figure 6, 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 assigned as unit 8. The physical order of the switches is from top to bottom (unit 1 to unit 8). Note: Certain network management station (NMS) applications assume a stack down configuration for the graphical user interface (GUI) that represents the stack.
Unit 1 In 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Unit 7 Unit 8 2 O ut 1 = Base unit 3 2 = Last unit 3 = Cascade cable (PN 303978-A) 4 = Cascade max-return cable (PN 303979-A) 4 BS0034A Figure 6.
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 interruption. Figure 7 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 7, unit 3 becomes nonoperational.
Cascade A Out Cascade A In 1 Unit 1 Unit 2 A Unit 3 B Unit 4 Unit 5 2 1 = Base unit 3 2 = Last unit 3 = Cascade cable (PN 303978-A) 4 = Cascade max-return cable (PN 303979-A) 4 BS0035A Figure 7.
Installation This section describes how to connect up to eight switches into a redundant stack. The stack can consist of any combination of supported switch models. Before installing your equipment, review the previous sections of this guide. Note: For stacking three or more units, order the optional 1 meter (3.28 ft) or 3 meter (9.84 ft) cascade return cable (Figure 2).
Installing the 400-ST1 Cascade Module The Cascade Module slot on supported switches 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. Remove the filler panel from the Cascade Module slot (Figures 8 and 9). • BayStack 450 and 410-24T -- Use a Phillips-head screwdriver to loosen the two thumbscrews and remove the filler panel (Figure 8).
• Business Policy Switch -- Use a flat-blade screwdriver to gently pry off the filler panel (Figure 9). Business Policy Switch 1 1 = Filler panel 2 = Cascade module slot Figure 9. 3. 2 BS0036C Business Policy Switch Filler Panel Insert the 400-ST1 Cascade Module into the chassis slot taking care to slide the module into the guides provided on the chassis (Figure 10). Caution: Make 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 Base Cascade A In BS0037A Figure 10. Installing a 400-ST1 Cascade Module 4. Press the module firmly into the chassis slot. Make 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 “Installing and Connecting Multiple Switches” on page 22.
Installing and Connecting Multiple Switches The procedure to install and connect multiple switches is similar for standard 19-inch utility rack, shelf, and tabletop installations. To install multiple switches, follow these steps: 1. Install one unit at a time in the rack, on a shelf, or on a tabletop. Refer to your switch’s User Guide for specific requirements and instructions for installing your switch in a standard 19-inch utility rack, on a shelf, or on a tabletop. 2.
5. Set the Unit Select switch for the base unit to the Base (up = Base) position (Figure 11). Note: In a mixed stack configuration that contains one or more Business Policy Switch units, the Business Policy Switch must be configured as the base unit. If you do not designate the Business Policy Switch as the base unit, the stack will not operate. 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.
7. Connect the units using the supplied cascade cables (Figure 12). a. Connect one end of a cascade cable to the Cascade A Out connector on the Base Unit (unit 1). 1 Unit 1 Unit 2 Cascade A Out Unit Select Cascade A In Cascade A Out Unit Select Cascade A In Cascade A Out Unit Select Cascade A In Cascade A Out Unit Select Cascade A In 3 Unit 3 2 4 Unit 4 1 = Base unit 2 = Last unit 3 = Cascade cable (PN 303978-A) 4 = Cascade max-return cable (PN 303979-A) BS0039A Figure 12.
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 return cable to the Cascade A Out connector.
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 initialization sequence takes approximately 30 seconds for completion.
2. Plug the other ends of the AC power cords into a grounded AC power strip. 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).
Pwr Cas Up Pwr Cas Up Status Dwn Status Dwn RPSU Base RPSU Base 1 2 BayStack 450-24T Switch 21 23 22 24 Cas 1 = Base unit only 2 = All other units in stack Figure 13. • BS0040B 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 13, cycle the power to the stack and verify the LEDs.
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, Nortel Networks recommends that you renumber the entire stack after any modification involving configuration changes.
Assigning a New Base Unit to the Stack To assign a new base unit to the stack, complete the following steps: Note: Nortel Networks recommends that you 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 11 on page 23 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.
Adding Units to the Stack This section describes how to add one or more units to the middle of a stack or to the end of a stack. Note: Refer to your switch’s User Guide for information about installing units on a tabletop or in a standard 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 14).
For tabletop configurations, temporarily move units 1 and 2 to allow space for units 5 and 6. 1 Unit 1 In Unit 2 Unit 3 Unit 4 2 O ut 1 = Base unit 3 2 = Last unit 3 = Cascade cable (PN 303978-A) 4 = Cascade max-return cable (PN 303979-A) 4 BS0041A Figure 14. 4. Adding to Middle of Stack Add the new units in the desired location. For tabletop configurations, replace units 1 and 2 (temporarily moved in Step 4).
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 your switch’s User Guide.
1 Cascade Module Unit 1 In Cascade Module Unit 2 Cascade Module Unit 3 Cascade Module Unit 4 Cascade Module Cascade Module 2 O ut 3 1 = Base unit 2 = Last unit 3 = Cascade cable (PN 303978-A) 4 = Cascade max- return cable (PN 303979-A) 4 BS0042A Figure 15. 2. Adding to End of Stack Disconnect the cascade return cable (item 4) from the Cascade A Out connector at unit 4. Leave the other end of the cascade return cable connected to the Cascade A In connector at unit 1. 3.
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 return cable from 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 your switch’s User Guide.
Removing/Replacing Adjacent Units To remove/replace adjacent units from an operating stack, complete the following steps (Figure 16): 1. Remove the cascade cable from the Cascade A Out connector at unit 2. 1 Unit 1 In Cascade A Out Unit 2 Unit 3 Unit 4 Cascade A In Unit 5 Unit 6 2 O ut 1 = Base unit 2 = Last unit BS0043A Figure 16.
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 your switch’s User Guide. Removing/Replacing Nonadjacent Units Note: Remove and replace the units individually to avoid segmenting the stack configuration.
5. Repeat steps 1 to 4 for unit 5. 1 Unit 1 In Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 2 ut O 1 = Base unit 2 = Last unit BS0044A Figure 17. 6. Removing Nonadjacent Units Renumber the order of the units for the new stack configuration (if desired). You can renumber the unit numbers as described in your switch’s User Guide.
Upgrading the Switch Firmware Your switch firmware provides a code load facility that allows you to upgrade the firmware image over any switch port, including any MDA ports. Note: The BayStack 400-ST1 Cascade Module will not operate with BayStack 450 switches that are configured with BayStack 450 software versions earlier than version V1.1.0. You must upgrade the switches to BayStack 450 software version V1.1.0 (or later) before you install the BayStack 400-ST1 Cascade Modules.
Accessing the Latest Documentation If you are upgrading your switch, be sure to obtain the latest version of the switch’s User Guide. You can obtain the latest updates to your product documentation, including release notes, by visiting the Nortel 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.
