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A chassis is a representation of the physical frame or structure of a multi-component device. A chassis management application is typically used to monitor the ups and downs of the device, configure ports, or manage fault in the device. The image given below is a typical example of a chassis view of a switch.
A typical chassis device consists of the following components.
Front Panel with the displays and the LED's showing the soundness of different connections.
Shelves that support a series of slots. The chassis framework may or may not be divided into shelves.
Slots in which cards are inserted.
Cards that are plugged into the slots.
Chassis Types
Chassis Applications are of two types based on the data provided to build the application. They are
Device based Chassis (Chassis Application built for managing Device).
Managed Object based Chassis (Chassis Application built for managing Managed Objects in Web NMS Database).
Device based Chassis
The application that directly contacts the device for management information is called as "Device based Chassis". The management information includes the data required to construct the Chassis Application. The application shows the performance data of the components in direct contact with the device. It also configures the information of the components.
Managed Object based Chassis
The application that directly contacts the Web NMS database for MO data is called "Managed Object based Chassis". For Managed Object based chassis the MO (Managed Object ) data should be populated in the Web NMS database. If necessary, the performance and configuration management that affects the device should also be done in the Web NMS database.
Chassis Mode
Based on the Card component in a Chassis, the Chassis applications can be further divided into the following:
Static Chassis
Dynamic Chassis
The above division is based on the following behaviour
Cards that are fixed in a particular slot
Cards that change from one slot to another from time to time.
Example of a Chassis Device
Number of Shelves:1
Number of Slots in shelf : 5
Number of Cards in shelf : 5
Number of Card Types in shelf: 4
The initial arrangement of cards in slots is as given below
| Slot | Card Type |
|---|---|
|
Slot1 |
CPU Card |
|
Slot2 |
Line Card |
|
Slot3 |
Blank Card |
|
Slot4 |
NP Card |
|
Slot5 |
Line Card |
In the above scenario if the Device is monitored only for status and performance, with the cards remaining unchanged in their respective slots, the Device can be represented as a Static Chassis. This type of applications are built based on the Device.
On the other hand, if the cards swap positions during runtime, the Device can be represented as Dynamic Chassis. In the above example if the card in Slot2 and Slot4 are interchanged, or all of the slots have Line card etc then the device applications needs constant updates on the position of the cards and constant FCP management functions is a must. Dynamic Chassis applications can be built for Devices or Managed Objects in Web NMS Database.
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