Cisco Cisco FastHub 412M 10 100 Repeater

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:

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. 
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