Cisco FASTHUB 412 12 PORT 10/100 STACKABLE 사양 가이드

 FastHub Stacks C-5

FastHub 400 models can be added to or removed from the hub stack without powering
down any hub in the stack. This is referred to as hot swapping. The stack reconfigures itself
in approximately 30 seconds. If you power down a hub in the middle of the stack and keep
it interconnected to the stack, the hubs above and below it continue to communicate.

If you are removing a management hub and there is no secondary management

hub in the stack, you lose manageability for the entire hub stack. In addition, if the removed
management hub is mounted between two operating hubs, you split the Ethernet segment
into two separate segments when the stacking cables are disconnected.

Do not install three or more FastHub 400M models in the stack. No electrical

damage occurs; however, management functions might not perform properly, and
erroneous management information might be created.

If you keep a hub interconnected to the stack but only power down that hub, the hubs

above and below that powered-down hub will still communicate with each other. However,
you will not be able to manage that hub, and it will not be displayed from the hub manager.

Follow these steps to remove the hub:

On the hub being removed, disconnect the stacking cable from either the DOWN
or UP connectors or from both connectors.

Remove the hub from the rack or tabletop.

If you have a stack that has two management hubs and you remove one management

hub from the stack, it will have the same IP address as the stack. Avoid IP conflict by
changing the IP address of the removed management hub before you reuse it and connect
it to another hub stack in the network.

Removing hubs from the hub stack can introduce noise into the network through the

disconnected stacking cables. To prevent this, it is important that you either install a
replacement hub or reconnect the cables to existing hubs in the stack. See the “Building a
Hub Stack” section on page C-4 to interconnect the hubs.