Cisco Systems 3550 Monitoring and Maintaining CDP

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Catalyst 3550 Multilayer Switch Software Configuration Guide
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Chapter13 Configuring CDP Monitoring and Maintaining CDP
Monitoring and Maintaining CDP
To monitor and maintain CDP on your device, perform one or more of these tas ks, be ginn ing in
privileged EXEC mode.
These are examples of outputs from the CDP show privileged EXEC commands:
Switch# show cdp
Global CDP information:
Sending CDP packets every 50 seconds
Sending a holdtime value of 120 seconds
Sending CDPv2 advertisements is enabled
Command Description
clear cdp counters Reset the traffic counters to zero.
clear cdp table Delete the CDP table of information about neighbors.
show cdp Display global information, such as frequency of transmissions and the holdtime
for packets being sent.
show cdp entry entry-name
[protocol |version]Display information about a specific neighbor.
You can enter an asterisk (*) to display all CDP neighbors, or you can enter the
name of the neighbor about which you want information.
You can also limit the display to information about the protocols enabled on the
specified neighbor or information about the version of software running on the
device.
show cdp interface [type number] Display information about interfaces where CDP is enabled.
You can limit the display to the type of interface or the number of the interface
about which you want information (for example, entering gigabitethernet 0/1
displays information only about Gigabit Ethernet port 1).
show cdp neighbors [type number]
[detail]Display information about neighbors, including device type , in ter face t y pe a nd number, holdtime settings, capabilities, platform, and port ID.
You can limit the display to neighbors on a specific type or number of interface
or expand the display to provide more detailed information.
show cdp traffic Display CDP counters, including the number of packets sent and received and
checksum errors.