To enable the Cisco Discovery Protocol (CDP) and configure CDP attributes, use the cdp command. To disable CDP or reset CDP attributes, use the no form of this command.
cdp { advertise { v1 | v2 } | enable | format device-id { mac-address | serial-number | system-name } | holdtime seconds | timer seconds }
no cdp { advertise | enable | format device-id { mac-address | serial-number | system-name } | holdtime seconds | timer seconds }
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advertise
{
v1
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v2
}
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Configures the version to use to send CDP advertisements. Version-2 is the default state.
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enable
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Enables CDP for all Ethernet interfaces.
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format device-id
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Configures the format of the CDP device ID.
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mac-address
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Uses the MAC address as the CDP device ID.
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serial-number
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Uses the serial number as the CDP device ID.
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system-name
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Uses the system name, which can be expressed as a fully qualified domain name, as the CDP device ID. This is the default.
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holdtime
seconds
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Specifies the amount of time a receiver should hold CDP information before discarding it. The range is from 10 to 255 seconds; the default is 180 seconds.
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timer
seconds
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Sets the transmission frequency of CDP updates in seconds. The range is from 5 to 254; the default is 60 seconds.
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None
Global configuration mode
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Release
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Modification
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4.0(0)N1(1a)
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This command was introduced.
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This example shows how to enable CDP on all Ethernet interfaces:
This example shows how to configure the MAC address as the CDP device ID:
This example shows how to disable CDP on all Ethernet interfaces:
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Command
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Description
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show cdp
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Displays Cisco Discovery Protocol (CDP) information.
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