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Cisco FastHub 400 10/100 Series Repeaters

Release Notes for the FastHub 400 10/100 Series, January 2003

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Release Notes for the FastHub 400 10/100 Series

Table Of Contents

Release Notes for the FastHub 400 10/100 Series

Contents

Documentation Notes

Limitations

Usage Guidelines

Stacking Guidelines

Stacking Example

Clearing the NVRAM of a Management Hub in a Redundant Stack

Resolved Caveats

Resolved Caveats in Release 1.00.08

Resolved Caveats in Release 1.00.06

Resolved Caveats in Release 1.00.04

Resolved Caveats in Release 1.00.03

Related Documentation

Obtaining Documentation

Cisco.com

Documentation DVD

Ordering Documentation

Documentation Feedback

Cisco Product Security Overview

Reporting Security Problems in Cisco Products

Obtaining Technical Assistance

Cisco Technical Support Website

Submitting a Service Request

Definitions of Service Request Severity

Obtaining Additional Publications and Information


Release Notes for the FastHub 400 10/100 Series


Revised March 2005

These release notes include important information about the FastHub 400 10/100 series (hereafter referred to as the FastHub 400) and any limitations, restrictions, and caveats that apply to it.

For the complete list of FastHub 400 10/100 series documentation, see the "Related Documentation" section.

The tracking numbers for some items in this document are added for your convenience.

Contents

"Documentation Notes" section

"Limitations" section

"Usage Guidelines" section

"Resolved Caveats" section

"Obtaining Documentation" section

"Obtaining Technical Assistance" section

Obtaining Additional Publications and Information

Documentation Notes

The installation and configuration guide incorrectly lists the CISCO-SIBU-SIMPLE-UPGRADE-MIB.my MIB as a supported MIB. The hub does not support this MIB.

In Release 1.00.03, the enable password must have between 4 to 7 alphanumeric characters. The string can include all alphanumeric characters except a space or a question mark and is case sensitive.

Limitations

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)

Usage Guidelines

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, see 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. See your modem manual for the correct configuration command syntax. (CSCdk83009)

Stacking Guidelines

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:

Itself.

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.

Stacking Example

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.)

Table 1

Original Stack
Replaced with
New Stack

Hub 1

 

Hub 1 (store M1)

Hub 2

 

Hub 2 (store 2)

(Hub 3) ---->

Hub A ---->

Hub 3 (store A: default)

Hub 4

 

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.)

Table 2

Original Stack
Reinstalled
New Stack

Hub 1

 

Hub 1 (store M1)

Hub 2 ------->

Hub 4 ---->

Hub 2 (store 4: saved)

Hub 3A ---->

 

Hub 3 (store 2: saved)

(Hub 4)

 

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).

See 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.

See 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.


Resolved Caveats

These caveats were resolved in these releases:

"Resolved Caveats in Release 1.00.08" section

"Resolved Caveats in Release 1.00.06" section

"Resolved Caveats in Release 1.00.04" section

"Resolved Caveats in Release 1.00.03" section

Resolved Caveats in Release 1.00.08

This configuration caveat was resolved in Release 1.00.08:

CSCdw69907

The Cisco FastHub 400 is susceptible to Simple Network Management Protocol (SNMP) vulnerabilities. These vulnerabilities can be easily and repeatedly demonstrated with the use of the University of Oulu Secure Programming Group (OUSPG) "PROTOS" Test Suite for SNMPv1. The test suite is generally used to analyze a protocol and produce messages that probe various design limits within an implementation of a protocol. Test packets containing overly-long or malformed object identifiers and other combinations of exceptional values in various fields can be programmatically generated and then transmitted to a network device under test. The PROTOS test suite for SNMPv1, as distributed, contains approximately 53,000 individual test cases.

Further details are described in the advisory at this link:

http://www.cisco.com/warp/public/707/cisco-malformed-snmp-msgs-non-ios-pub.shtml

Resolved Caveats in Release 1.00.06

This problem was resolved in Release 1.00.06:

CSCdv15665

You no longer lose connectivity across the uplink module when moving to a new port on the same FastHub 400 or to a port on a different FastHub 400.

Resolved Caveats in Release 1.00.04

This problem was resolved in Release 1.00.04:

CSCdr79923

An enable password is no longer limited to less than eight characters.

Resolved Caveats in Release 1.00.03

This problem was resolved in Release 1.00.03:

CSCdr17179

Using Cisco Discovery Protocol (CDP) with a FastHub 400M no longer occasionally locks the console.

Related Documentation

These documents provide complete information about the hub and are available from this Cisco.com site:

http://www.cisco.com/univercd/cc/td/doc/product/fhubs/fh400/index.htm

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

Obtaining Documentation

Cisco documentation and additional literature are available on Cisco.com. Cisco also provides several ways to obtain technical assistance and other technical resources. These sections explain how to obtain technical information from Cisco Systems.

Cisco.com

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Ordering Documentation

You can find instructions for ordering documentation at this URL:

http://www.cisco.com/univercd/cc/td/doc/es_inpck/pdi.htm

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We appreciate your comments.

Cisco Product Security Overview

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http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html

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Reporting Security Problems in Cisco Products

Cisco is committed to delivering secure products. We test our products internally before we release them, and we strive to correct all vulnerabilities quickly. If you think that you might have identified a vulnerability in a Cisco product, contact PSIRT:

Emergencies — security-alert@cisco.com

Nonemergencies — psirt@cisco.com


Tip We encourage you to use Pretty Good Privacy (PGP) or a compatible product to encrypt any sensitive information that you send to Cisco. PSIRT can work from encrypted information that is compatible with PGP versions 2.x through 8.x.

Never use a revoked or an expired encryption key. The correct public key to use in your correspondence with PSIRT is the one that has the most recent creation date in this public key server list:

http://pgp.mit.edu:11371/pks/lookup?search=psirt%40cisco.com&op=index&exact=on


In an emergency, you can also reach PSIRT by telephone:

1 877 228-7302

1 408 525-6532

Obtaining Technical Assistance

For all customers, partners, resellers, and distributors who hold valid Cisco service contracts, Cisco Technical Support provides 24-hour-a-day, award-winning technical assistance. The Cisco Technical Support Website on Cisco.com features extensive online support resources. In addition, Cisco Technical Assistance Center (TAC) engineers provide telephone support. If you do not hold a valid Cisco service contract, contact your reseller.

Cisco Technical Support Website

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http://tools.cisco.com/RPF/register/register.do


Note Use the Cisco Product Identification (CPI) tool to locate your product serial number before submitting a web or phone request for service. You can access the CPI tool from the Cisco Technical Support Website by clicking the Tools & Resources link under Documentation & Tools. Choose Cisco Product Identification Tool from the Alphabetical Index drop-down list, or click the Cisco Product Identification Tool link under Alerts & RMAs. The CPI tool offers three search options: by product ID or model name; by tree view; or for certain products, by copying and pasting show command output. Search results show an illustration of your product with the serial number label location highlighted. Locate the serial number label on your product and record the information before placing a service call.


Submitting a Service Request

Using the online TAC Service Request Tool is the fastest way to open S3 and S4 service requests. (S3 and S4 service requests are those in which your network is minimally impaired or for which you require product information.) After you describe your situation, the TAC Service Request Tool provides recommended solutions. If your issue is not resolved using the recommended resources, your service request is assigned to a Cisco TAC engineer. The TAC Service Request Tool is located at this URL:

http://www.cisco.com/techsupport/servicerequest

For S1 or S2 service requests or if you do not have Internet access, contact the Cisco TAC by telephone. (S1 or S2 service requests are those in which your production network is down or severely degraded.) Cisco TAC engineers are assigned immediately to S1 and S2 service requests to help keep your business operations running smoothly.

To open a service request by telephone, use one of the following numbers:

Asia-Pacific: +61 2 8446 7411 (Australia: 1 800 805 227)
EMEA: +32 2 704 55 55
USA: 1 800 553-2447

For a complete list of Cisco TAC contacts, go to this URL:

http://www.cisco.com/techsupport/contacts

Definitions of Service Request Severity

To ensure that all service requests are reported in a standard format, Cisco has established severity definitions.

Severity 1 (S1)—Your network is "down," or there is a critical impact to your business operations. You and Cisco will commit all necessary resources around the clock to resolve the situation.

Severity 2 (S2)—Operation of an existing network is severely degraded, or significant aspects of your business operation are negatively affected by inadequate performance of Cisco products. You and Cisco will commit full-time resources during normal business hours to resolve the situation.

Severity 3 (S3)—Operational performance of your network is impaired, but most business operations remain functional. You and Cisco will commit resources during normal business hours to restore service to satisfactory levels.

Severity 4 (S4)—You require information or assistance with Cisco product capabilities, installation, or configuration. There is little or no effect on your business operations.

Obtaining Additional Publications and Information

Information about Cisco products, technologies, and network solutions is available from various online and printed sources.

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http://www.cisco.com/packet

iQ Magazine is the quarterly publication from Cisco Systems designed to help growing companies learn how they can use technology to increase revenue, streamline their business, and expand services. The publication identifies the challenges facing these companies and the technologies to help solve them, using real-world case studies and business strategies to help readers make sound technology investment decisions. You can access iQ Magazine at this URL:

http://www.cisco.com/go/iqmagazine

Internet Protocol Journal is a quarterly journal published by Cisco Systems for engineering professionals involved in designing, developing, and operating public and private internets and intranets. You can access the Internet Protocol Journal at this URL:

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