xStack® DES-3528/DES-3552 Series Layer 2 Managed Stackable Fast Ethernet Switch Web UI Reference Guide
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Layer 2 Protocol Tunneling Settings
The layer 2 protocol tunneling is used to tunnel the layer 2 protocol packets. When the device is operating with the
Q-in-Q enabled, DA will be replaced by the tunnel multicast address, and the BPDU will be tagged with the tunnel
VLAN based on the QinQ VLAN configuration and the tunnel/uplink setting. When the device is operating with the
Q-in-Q disabled, the BPDU will have its DA replaced by the tunnel multicast address and is transmitted out based
on the VLAN configuration and the tunnel/uplink setting.
To view this window, click L2 Features > Layer 2 Protocol Tunneling Settings, as shown below:
The fields that can be configured are described below:
Parameter Description
Layer 2 Protocol
Tunneling State
Toggle the State field to either enable or disable Layer 2 Protocol Tunneling of ports.
Unit
Select a unit in the stack to be configured.
From Port / To Port
Specify the ports on which the L2PT to be configured.
Type
Specify the layer 2 protocol tunnel type which will apply on the specified ports.
UNI - Specify the port is UNI port.
NNI - Specify the port is NNI port.
None –Disable the tunneling function.
Tunneled Protocol
Specify tunneled protocols on this UNI port.
STP - Specify the BPDU received on these UNI will be tunneled.
GVRP - Specify the GVRP PDU received on these UNI will be tunneled.
Protocol MAC - Specify the destination MAC address of the L2 protocol packets that will
tunneled on these UNI ports. The MAC address can be 01-00-0C-CC-CC-CC or 01-00-0C-
CC-CC-CD.
All - Specify all supported.
Threshold
Specify the drop threshold for packets-per-second accepted on this UNI port. The port
drops the PDU if the protocol’s threshold is exceeded. The range of the threshold value is 0
to 65535 (packet/second). The value 0 means unlimited. By default, the value is 0.
Click the Apply button to accept the changes made for each individual section.
Spanning Tree
This Switch supports three versions of the Spanning Tree Protocol: 802.1D-1998 STP, 802.1D-2004 Rapid STP,
and 802.1Q-2005 MSTP. 802.1D-1998 STP will be familiar to most networking professionals. However, since
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