Table 1 summarizes existing TLVs. Existing TLV Descriptions TLV Definition Device-ID Identifies the device name in the form of a character string. Address TLV Contains a list of network addresses of both receiving and transmitting devices. Port-ID Identifies the port on which the CDP packet is sent. Capabilities Describes the device's functional capability in the form of a device type, for example, a switch.
Version Contains information about the software release version on which the device is running.
Platform Describes the hardware platform name of the device, for example, Cisco 4500. IP Network Prefix Contains a list of network prefixes to which the sending device can forward IP packets. This TLV is used by network operators to verify VTP domain configuration in adjacent network nodes. This TLV is used by CDP to indicate, per interface, the assumed VLAN for untagged packets on the interface. CDP learns the native VLAN for an interface.