Cisco Cisco FastHub 412M 10 100 Repeater

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 

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. 

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. 
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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).

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)

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)