Table of Contents
Release Notes for the
FastHub 400 10/100 Series
November 10, 1999
These release notes provide information on the FastHub 400 10/100 Series (hereafter referred to as the FastHub 400 models).
The tracking numbers for some items in this document are added for your convenience.
Some series 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 Release 1.00.02 detects the absence of an extension module and isolates the extension port from the hub.
- The FastHub 400M model can store up to 4096 MAC addresses in memory; the optional switched uplink modules can store up to 1536 MAC addresses. If you experience 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]
- Before connecting a FastHub 400M model to a modem, you should 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. [CSCdk83978] [CSCdk83009]
- You must purchase and use the FastHub 400 stacking cable (model 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.
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 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 M1 hub continuously stores the configuration settings for the following stack elements:
Note The primary management hub is referred to as the M1 hub, the secondary management hub as the M2 hub.
- Itself
- The most recent three hubs it has managed (whether or not they are currently being managed)
- One each Tx and Fx switched uplink module for itself and each of the most recent three hubs it has 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, that device can assume its former configuration in the stack through the M1 hub. Whether or not this happens depends upon whether the stored configuration for that particular device has been retained by the M1 hub or overwritten through intervening changes. [CSCdk90005]
- For example, in a stack of hubs in which hub 1 is the FastHub 400 model M1 hub and hubs 2, 3, and 4 are FastHub 400 model unmanaged hubs, the following conditions would apply:
- If you remove hub 3 and replace it with a new hub (hub A), the new hub would keep its default configuration:
Original Stack 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 was removed for troubleshooting purposes and later reinstalled in the second position in the stack, the M1 hub would recognize the serial number of that hub as belonging to one of its saved configurations and would apply the previously saved hub 4 configuration.
Original Stack 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)
To reset the nonvolatile RAM (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 as the M2 hub.
- When a second FastHub 400 model managed hub is added to a stack, the new 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. [CSCdk91393]
- You must power down the stack before resetting either or both management hubs.
- To do this, unplug the stacking cable from the management hub(s) you want to clear.
- Connect the hub to a management station
- Power up the hub and access the command-line interface (CLI).
- Refer to the online reference FastHub 400 10/100 Series Command Reference for information about accessing the CLI. See the "Cisco Connection Online" section of this release note for information about locating this online-only document through the Cisco web.
- Use the CLI delete nvram command to reset either or both management hubs to default values.
- Refer to the online reference FastHub 400 10/100 Series Command Reference for more information about this command.
- Whichever management hub 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. 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 cleared configuration first. This will prevent the redundant management hub from copying its saved configuration to the hub whose configuration you just cleared.
Use the following publications with this document:
- 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
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Posted: Tue Apr 4 17:06:19 PDT 2000
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