Table Of Contents
Release Notes for the
FastHub 400 10/100 Series
These release notes provide information on the FastHub 400 10/100 series (hereafter referred to as the FastHub 400s).
The tracking numbers for some items in this document are added for your convenience.
The FastHub 400M can store up to 4096 MAC addresses in memory. The optional switched uplink modules can store up to 1536 MAC addresses. If there is excessive flooding of unicast packets on these devices, your hub or module might have reached its maximum. To clear the MAC address table, power-cycle the hub. [CSCdk90641]
•Some 400 FastHubs have improperly terminated 100-MB TXEN signal lines at the extension port. If this problem occurs when no extension module is present, 100-MB data can be corrupted. Firmware releases 1.00.02 and later detect the absence of an extension module and isolate the extension port from the hub.
•You must purchase and use the FastHub 400 stacking cable (part number WS-C400-CAB-EXP) to create a hub stack of interconnected FastHub 400 models. Do not use any other cable for this purpose. You can order this cable from your Cisco representative or reseller.
•A FastHub 400 does not support modem connections over a telephone line to a PC connected to another modem by a telephone line. To connect to a FastHub 400 using a modem, refer to your modem manual for the correct configuration command syntax. [CSCdk83978]
•Before connecting a FastHub 400M model to a modem, configure your modem to ignore input from the data terminal equipment (DTE) during dial-out or dial-in. Without this precaution, there is a small chance that the modem could disconnect. Refer to your modem manual for the correct configuration command syntax. [CSCdk83009]
When changing or moving units within a managed hub stack, note these configuration rules.
•The stacking cable connectors are lockable. When you insert the stacking cable, be sure that it snaps into place.
•The stacking cables are not hot-swappable. You must power down the hub stack before connecting or disconnecting a stacking cable. If you connect or disconnect a stacking cable while the power is on, power-cycle the stack to ensure correct stack-management operation.
•The primary management hub is referred to as the M1 hub. The secondary management hub is referred to as the M2 hub.
•The M1 hub continuously stores the configuration settings for these stack elements:
–The three hubs that it has most recently managed (whether or not the hubs are currently being managed).
–TX and FX switched uplink modules for itself and for each of the three hubs that it has most recently managed.
This means that if you remove a hub (other than the M1 hub) or module from the stack and later reinstall the same device, the M1 hub reconfigures that device with its former configuration in the stack. Whether or not this happens depends upon whether the stored configuration for that particular device has been retained by the M1 hub or overwritten in subsequent changes.
In a stack of hubs where hub 1 is the FastHub 400 M1 hub and hubs 2, 3, and 4 are FastHub 400 unmanaged hubs, these conditions apply:
–If you remove hub 3 and replace it with a new hub (hub A), the new hub keeps its default configuration. (See Table 1.)
Original Stack Replaced with New Stack
Hub 1 (store M1)
Hub 2 (store 2)
(Hub 3) ---->
Hub A ---->
Hub 3 (store A: default)
Hub 4 (store 4)
–If hub 4 is removed for troubleshooting purposes and later reinstalled in the second position in the stack, the M1 hub recognizes the serial number of that hub as belonging to one of its saved configurations and applies the previously saved hub 4 configuration. (See Table 2.)
Original Stack Reinstalled New Stack
Hub 1 (store M1)
Hub 2 ------->
Hub 4 ---->
Hub 2 (store 4: saved)
Hub 3A ---->
Hub 3 (store 2: saved)
Hub 4 (store 3A: saved)
Clearing the NVRAM of a Management Hub in a Redundant Stack
To reset the nonvolatile random-access memory (NVRAM) configuration settings of one or both management hubs in a redundant stack configuration, note the following guidelines.
Note The primary management hub is referred to as the M1 hub. The secondary management hub is referred to as the M2 hub.
•When a second FastHub 400 managed hub is added to a stack, the new hub, referred to as the M2 hub, learns the saved configuration settings for the stack from the M1 hub. If the M1 hub fails, the M2 hub uses the saved configuration of the M1 hub.
•The delete nvram command only resets the NVRAM of the M1 hub. If an M2 hub is connected to the stack, the contents of the M2 hub NVRAM will immediately be copied to the NVRAM of the M1 hub. To ensure you reset the NVRAM of a FastHub 400, use one of these methods:
–To clear the NVRAM of the M1 hub, disconnect the stack cable between the M1 hub and the M2 hub, connect a console cable to the M1 hub, and use the delete nvram command.
–To clear the NVRAM of the M2 hub, disconnect the stack cable between the M1 hub and the M2 hub, connect a console cable to the M2 hub, and use the delete nvram command. [CSCdk91393]
•You must power down the stack before resetting either or both management hubs. To do this, unplug the stacking cable from the management hubs that you want to reset.
•Connect the hub to a management station.
•Power on the hub and access the command-line interface (CLI).
•Refer to the online FastHub 400 10/100 Series Command Reference for information about accessing the CLI. See the "Obtaining Documentation" section of this document for information about locating this document through Cisco.com.
•Use the CLI delete nvram command to reset either or both management hubs to their default values.
•Refer to the online reference FastHub 400 10/100 Series Command Reference for more information about this command.
•The management hub that is powered on first becomes the new M1 hub in the stack because the hub with the longest up time is by default the M1 hub.
Note If you delete the NVRAM configuration settings for one management hub and not the other, be sure to power on the management hub with the deleted configuration first. This prevents the redundant management hub from copying its saved configuration to the hub whose configuration you just deleted.
This section describes resolved caveats in the FastHub 400s.
Resolved Caveats in Release v1.00.04
This problem was resolved in release v.1.00.04:
An enable password is no longer limited to less than eight characters.
Resolved Caveats in Release v1.00.03
This problems was resolved in release v.1.00.03:
Using Cisco Discovery Protocol (CDP) with a FastHub 400M no longer occasionally locks the console.
These publications provide more information about the FastHub 400 models:
•FastHub 400 10/100 Series Cabling and Start Up
•FastHub 400 10/100 Series Installation and Configuration Guide
•Installation Notes for the FastHub 400 10/100 Series Switched Uplink Modules
•FastHub 400 10/100 Series Command Reference (online only)
•FastHub 400 10/100 series Hub Manager online help
The following sections provide sources for obtaining documentation from Cisco Systems.
World Wide Web
You can access the most current Cisco documentation on the World Wide Web at the following sites:
Cisco Documentation CD-ROM
Cisco documentation and additional literature are available in a CD-ROM package, which ships with your product. The Cisco Documentation CD-ROM is updated monthly and may be more current than printed documentation. The CD-ROM package is available as a single unit or as an annual subscription.
Cisco documentation is available in the following ways:
•Registered Cisco Direct Customers can order Cisco Product documentation from the Networking Products MarketPlace:
•Registered Cisco.com users can order the Documentation CD-ROM through the online Subscription Store:
•Nonregistered Cisco.com users can order documentation through a local account representative by calling Cisco corporate headquarters (California, USA) at 408 526-7208 or, in North America, by calling 800 553-NETS(6387).
Obtaining Technical Assistance
Cisco provides Cisco.com as a starting point for all technical assistance. Customers and partners can obtain documentation, troubleshooting tips, and sample configurations from online tools. For Cisco.com registered users, additional troubleshooting tools are available from the TAC website.
Cisco.com is the foundation of a suite of interactive, networked services that provides immediate, open access to Cisco information and resources at anytime, from anywhere in the world. This highly integrated Internet application is a powerful, easy-to-use tool for doing business with Cisco.
Cisco.com provides a broad range of features and services to help customers and partners streamline business processes and improve productivity. Through Cisco.com, you can find information about Cisco and our networking solutions, services, and programs. In addition, you can resolve technical issues with online technical support, download and test software packages, and order Cisco learning materials and merchandise. Valuable online skill assessment, training, and certification programs are also available.
Customers and partners can self-register on Cisco.com to obtain additional personalized information and services. Registered users can order products, check on the status of an order, access technical support, and view benefits specific to their relationships with Cisco.
To access Cisco.com, go to the following website:
Technical Assistance Center
The Cisco TAC website is available to all customers who need technical assistance with a Cisco product or technology that is under warranty or covered by a maintenance contract.
Contacting TAC by Using the Cisco TAC Website
If you have a priority level 3 (P3) or priority level 4 (P4) problem, contact TAC by going to the TAC website:
P3 and P4 level problems are defined as follows:
•P3—Your network performance is degraded. Network functionality is noticeably impaired, but most business operations continue.
•P4—You need information or assistance on Cisco product capabilities, product installation, or basic product configuration.
In each of the above cases, use the Cisco TAC website to quickly find answers to your questions.
To register for Cisco.com, go to the following website:
If you cannot resolve your technical issue by using the TAC online resources, Cisco.com registered users can open a case online by using the TAC Case Open tool at the following website:
Contacting TAC by Telephone
If you have a priority level 1(P1) or priority level 2 (P2) problem, contact TAC by telephone and immediately open a case. To obtain a directory of toll-free numbers for your country, go to the following website:
P1 and P2 level problems are defined as follows:
•P1—Your production network is down, causing a critical impact to business operations if service is not restored quickly. No workaround is available.
•P2—Your production network is severely degraded, affecting significant aspects of your business operations. No workaround is available.
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This document is to be used in conjunction with the documents listed in the FastHub 400 10/100 Series Installation and Configuration Guide.
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