# Using the Chassis MIB

To enable or disable traps, set the boardStatusChangeTrapEnable object in the Board table. You must also configure traps. See Configuring NMS SNMP for more information about configuring traps.

The agent uses the Chassis MIB Trap group to specify trap information. The Chassis Trap group has a valid object identifier, but does not contain usable information for developers.

## Hot Swap

Extracting a board removes the entry for that board from the Board table. If all the boards in a bus segment are extracted, that bus segment entry is removed from the Bus Segment table. If the removed entry creates a non-contiguous numerical sequence, that number is used the next time a board is inserted (and recognized by the agent). The Hot Swap software sees an inserted board before the agent has access to it.

Note: Hot Swap works only with the CompactPCI bus and is available only if the Hot Swap Manager is running. For more information on running the Hot Swap Manager, refer to the NMS OAM System User's Manual.

## Linking to the Trunk MIB

dsx1CircuitIdentifier in the Trunk MIB (RFC 2495) contains the name of the board that the line is on, as well as a board number and trunk number. The board text portion maps to the boardFamilyId in the Chassis MIB and the board number maps to the boardIndex in the Chassis MIB (both objects are in the Board table).

For example:

dsx1CircuitIdentifier = AG_4040_1TE_02_01
boardModelText = AG_4040_1TE
boardFamilyNumber = 2

In this example, dsx1CircuitIdentifier says that the trunk is on an AG_4040_1TE board, the family number is 2, and the trunk number is 1. The trunk number has no direct match in the Chassis MIB.