Cisco Cisco FastHub 412M 10 100 Repeater
2 Release Notes for the FastHub 400 10/100 Series
Limitations
Limitations
•
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]
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]
Usage Guidelines
•
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]
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.
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.
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 it snaps
into place.
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.
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]
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]