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1: Introduction
L2 Controller
The L2 controller, shown in Figure 1-10, is a rack-level controller that performs the
following functions:
•
Controls resource sharing.
•
Controls L1 controllers.
•
Maintains controller configuration and topology information.
•
Enables remote maintenance.
•
Routes data between upstream and downstream devices, as follows:
Upstream devices (for example, the system console) provide control for the system,
initiate commands for the downstream devices, and act on the messages that they
receive from downstream devices.
Downstream devices (for example, L1 controllers) perform the actions specified by
the L2 controller commands, send responses to the L2 controller that indicate the
status of the commands, and send error messages to the L2 controller.
Содержание Origin 300
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