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12-13
Configuring for Network Management Applications
CDP
Monitoring and Managing
the Switch
An SNMP utility can progressively discover CDP devices in a network by:
1. Reading a given device’s CDP Neighbor table (in the Management Infor-
mation Base, or MIB) to learn about other, neighbor CDP devices
2. Using the information learned in step 1 to go to and read the neighbor
devices’ CDP Neighbors tables to learn about additional CDP devices,
and so on
This section describes CDP operation in a Switch 4108GL. For information on
how to use an SNMP utility to retrieve the CDP information from the switch’s
CDP Neighbors table (in the switch’s MIB), refer to the documentation
provided with the particular SNMP utility. For information on the object
identifiers in the CDP MIB, see “CDP Neighbor Data and MIB Objects” on page
25.
CDP Terminology
■ CDP Device: A switch, server, router, workstation, or other device
running CDP.
■ CDP-Aware: A device that has CDP in its operating code (with CDP
either enabled or disabled in that device).
■ CDP-Disabled: A CDP-aware device on which CDP is currently
disabled.
■ Non-CDP Device: A device that does not have CDP in its operating
code.
■ CDP Neighbor: A CDP device that is either directly connected to
another CDP device or connected to that device by a non-CDP device,
such as some hubs.
General CDP Operation
The switch stores information about adjacent CDP devices in a CDP Neigh-
bors table maintained in the switch’s MIB (Management Information Base).
This data is available to SNMP-based applications designed to read CDP data
from the MIB. For example: