7 Marketing (0030c5_33dc59) | J4313A HP Switch. . . S
12 Mgmt NIC(099a05-09df9b | NIC Model X666 H
12 Mgmt NIC(099a05-09df11 | NIC Model X666 H
Enabling and Disabling CDP Operation
Enabling CDP operation (the default) on the switch causes the switch to add entries to its CDP Neighbors table
for any CDP packets it receives from other neighboring CDP devices.
Disabling CDP operation clears the switch's CDP Neighbors table and causes the switch to drop inbound CDP
packets from other devices without entering the data in the CDP Neighbors table.
Syntax:
[no] cdp run
Enables or disables CDP read-only operation on the switch.
(Default: Enabled)
Example:
To disable CDP read-only on the switch:
switch(config)# no cdp run
When CDP is disabled:
• show cdp neighbors
displays an empty CDP Neighbors table
• show cdp
displaysGlobal CDP informationEnable CDP [Yes]: No
Enabling or disabling CDP operation on individual ports
In the factory-default configuration, the switch has all ports enabled to receive CDP packets. Disabling CDP on a
port causes it to drop inbound CDP packets without recording their data in the CDP Neighbors table.
Syntax:
[no] cdp enable {< [e] port-list >}
Example:
To disable CDP on port A1:
switch(config)# no cdp enable a1
Filtering CDP information
In some environments it is desirable to be able to configure a switch to handle CDP packets by filtering out the
MAC address learns from untagged VLAN traffic from IP phones. This means that normal protocol processing
occurs for the packets, but the addresses associated with these packets is not learned or reported by the software
address management components. This enhancement also filters out the MAC address learns from LLDP and
802.1x EAPOL packets on untagged VLANs.
The feature is configured per-port.
Chapter 8 Configuring for Network Management Applications 205
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