Administration: Discovery
Configuring CDP
116 Cisco Small Business 200, 300 and 500 Series Managed Switch Administration Guide (Internal Version)
8
Setting CDP Properties
Similar to LLDP, CDP (Cisco Discovery Protocol) is a link layer protocol for directly
connected neighbors to advertise themselves and their capabilities to each other.
Unlike LLDP, CDP is a Cisco proprietary protocol.

CDP Configuration Workflow

The followings is sample workflow in configuring CDP on the device. You can also
find additional CDP configuration guidelines in the LLDP/CDP section.
STEP 1 Enter the CDP global parameters using the CDP Properties page
STEP 2 Configure CDP per interface using the Interface Setting page
STEP 3 If Auto Smartport is to detect the capabilities of CDP devices, enable CDP in the
Smartport Properties page.
See Identifying Smartport Type for a description of how CDP is used to identify
devices for the Smartport feature.
To enter CDP general parameters:
STEP 1 Click Administration > Discovery - CDP > Properties.
STEP 2 Enter the pa rameters.
•CDP Status—Select to enable CDP on the device.
•CDP Frames Handling—If CDP is not enabled, select the action to be taken
if a packet that matches the selected criteria is received:
-

Bridging

—Forward the packet based on the VLAN.
-

Filtering

—Delete the packet.
-

Flooding

—VLAN unaware flooding that forwards incoming CDP packets
to all the ports excluding the ingress ports.
•CDP Voice VLAN Advertisement—Select to enable the device to advertise
the voice VLAN in CDP on all of the ports that are CDP enabled, and are
member of the voice VLAN. The voice VLAN is configured in the Voice VLAN
Properties page.
•CDP Man datory TLVs Validati on—If selected, incoming CDP packets not
containing the mandatory TLVs are discarded and the invalid error counter is
incremented.