ProCurve Series 2300 and 2500 Switches Release Notes

186
Enhancements in Release F.02.02
CDP
This section describes CDP operation in the Series 2500 switches. 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 196.
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 Neighbors table. For example:
Figure 85. Example of How Series 2500 Switches Store Data on Neighbor CDP Devices
Switch "A"
with CDP Running
• The Neighbors table in switches "A", "B", and "D"
contain information on switch "C" only because
it is the only neighbor for these switches.
• The Neighbors table in switch "C" contains
information on switches "A", "B", and "D"
because all of these switches are neighbors of
switch "C".
Note: A given switch’s CDP Neighbor table
includes data only on neighbor CDP devices, but
not on that switch itself.
CDP Neighbor Table
Switch "C" data
Switch "B"
with CDP Running
CDP Neighbor Table
Switch "C" data
Switch "C"
with CDP Running
CDP Neighbor Table
Switch "A" data
Switch "B" data
Switch "D" data
Switch "D"
with CDP Running
CDP Neighbor Table
Switch "C" data