# Layer2 Protocol Tunneling Statistics

Port > Monitor > Layer2 Tunneling Statistics

This dialog box displays the Layer2 protocol tunneling statistics for this interface. The dialog box appears only when dot1q tunneling mode is enabled on this interface.

The following data is displayed:

- CDP Encapsulation PDUs (CltcTunnelEncapStats)

- CDP Deencapsulation PDUs (CltcTunnelDeEncapStats)

- VTP Encapsulation PDUs (CltcTunnelEncapStats)

- VTP Deencapsulation PDUs (CltcTunnelDeEncapStats)

- STP Encapsulation PDUs (CltcTunnelEncapStats)

- STP Deencapsulation PDUs (cltcTunnelDeEncapStats)

Do one of the following:

- To specify the refresh rate for this dialog box, select a value from the drop-down box.

- Click Start/Stop to begin/end device monitoring.

- Click Cancel to close the dialog box.

- Click Print to print the contents of the dialog box.

- Click Help to access online help.

Note: The Start/Stop toggle feature is supported only by CiscoView 5.x.

CDP Encapsulation PDUs (CltcTunnelEncapStats)

Indicates the number of tunneled incoming CDP encapsulated PDUs.

CDP Deencapsulation PDUs (CltcTunnelDeEncapStats)

Indicates the number of tunneled outgoing CDP deencapsulated PDUs.

VTP Encapsulation PDUs (CltcTunnelEncapStats)

Indicates the number of tunneled incoming VTP encapsulated PDUs.

VTP Deencapsulation PDUs (CltcTunnelDeEncapStats)

Indicates the number of tunneled outgoing VTP deencapsulated PDUs.

STP Encapsulation PDUs (CltcTunnelEncapStats)

Indicates the number of tunneled incoming STP encapsulated PDUs.

STP Deencapsulation PDUs (cltcTunnelDeEncapStats)

Indicates the number of tunneled outgoing STP deencapsulated PDUs.

Note: When none of these protocols are enabled for tunneling, a message appears stating this fact. In addition, no statistics will be available to monitor.

### Absolute/Differential Values Explained

The fields in monitor dialog boxes display either absolute or differential values:

- An absolute value indicates the value recorded for a monitor object at a specific polling time.

- A differential value is determined by subtracting the value recorded for a monitor object at the previous polling interval from the value recorded at the current polling interval.

Unless otherwise noted, the fields in this dialog box display differential values.