Change Management

This chapter contains the following information:

Change Management addresses removing and inserting modules in an active chassis. Both of these actions have implications in Cisco 7200/7400 Series Manager and must be handled effectively. You can remove or insert the following modules from a Cisco Edge Router chassis:

Port adapters (ATM, Ethernet, POS, DS-3)
AC or DC power supply modules

Removing a Module

When you remove an existing module from a chassis, Cisco 7200/7400 Series Manager detects that the module has been removed by heartbeat polling (which occurs every five minutes). Once Cisco 7200/7400 Series Manager detects the removed module, a major alarm is raised against the chassis object in Cisco 7200/7400 Series Manager.

Next, the chassis goes into subchassis discovery mode, to find out exactly which module has been removed. As a result, the removed module is placed in the lost comms no poll state, which causes a critical alarm to be raised against the module. This situation is rectified only when the module is put back into the chassis. When this occurs, heartbeat polling finds the reinserted module within five minutes and alerts the system to its presence. The alarms against the object are then cleared and the module moves into a normal (or perhaps errored) state.

Tips For detailed information on individual states, see the "Object States" section.

Inserting a New Module

Once you insert a new module into a chassis, it is discovered by heartbeat polling within five minutes. This means that it may take five minutes before the new module shows up in Cisco 7200/7400 Series Manager. Once Cisco 7200/7400 Series Manager finds the module, the chassis goes into subchassis discovery mode to find out exactly what module has been added. When the new module is discovered, it is added to the system and commissioned.

If the module is a port adapter that has interfaces, the interfaces are discovered during the subchassis discovery process. The commissioning process determines what state the module should be placed in: normal, errored, or mismatched state.

Mismatched State

The mismatched state occurs when the information found in the hardware and the information deployed in Cisco 7200/7400 Series Manager do not match. For instance, the mismatched state appears if you insert a module that does not correspond to the module type that has been predeployed in Cisco 7200/7400 Series Manager, or if the predeployment for the new module is incorrect.

Once the Cisco 7200/7400 Series Manager detects the new port adapter, it finds a mismatch. The port adapter is placed in the mismatched state and a major alarm is raised against the port adapter.

To rectify a mismatch problem, you must first assess the source of the problem. If the operator predeployed an incorrect port adapter, delete that port adapter and predeploy the correct port adapter. If the engineer inserted the wrong type of port adapter into the chassis, then remove that port adapter.

When you remove a port adapter, Cisco 7200/7400 Series Manager moves it to a lost comms no poll state. When you insert the correct port adapter, Cisco 7200/7400 Series Manager finds the new port adapter and downloads the correct predeployment and preconfiguration information, then places the port adapter in a normal state.

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