An indication of the format of Device-Id contained in the
corresponding instance of rlCdpTlvDeviceId.
serialNumber(1) indicates that the value of rlCdpTlvDeviceId
object is in the form of an ASCII string contain the device
serial number.
macAddress(2) indicates that the value of rlCdpTlvDeviceId
object is in the form of Layer 2 MAC address.
other(3) indicates that the value of rlCdpTlvDeviceId object
is in the form of a platform specific ASCII string contain
info that identifies the device. For example: ASCII string
contains serialNumber appended/prepened with system name.