Spanning Tree - D-Link DGS-3000 Series Reference Manual

The fields that can be configured are described below:
Parameter
Layer 2 Protocol
Tunneling State
From Port / To Port
Type
Tunneled Protocol
Threshold (0-65535)
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 802.1D-2004
RSTP and 802.1Q-2005 MSTP have been recently introduced to D-Link managed Ethernet switches, a brief
introduction to the technology is provided below followed by a description of how to set up 802.1D-1998 STP, 802.1D-
2004 RSTP, and 802.1Q-2005 MSTP.
802.1Q-2005 MSTP
Multiple Spanning Tree Protocol, or MSTP, is a standard defined by the IEEE community that allows multiple VLANs
to be mapped to a single spanning tree instance, which will provide multiple pathways across the network. Therefore,
these MSTP configurations will balance the traffic load, preventing wide scale disruptions when a single spanning tree
instance fails. This will allow for faster convergences of new topologies for the failed instance. Frames designated for
these VLANs will be processed quickly and completely throughout interconnected bridges utilizing any of the three
spanning tree protocols (STP, RSTP or MSTP).
An MSTI ID will classify these instances. MSTP will connect multiple spanning trees with a Common and Internal
Spanning Tree (CIST). The CIST will automatically determine each MSTP region, its maximum possible extent and
will appear as one virtual bridge that runs a single spanning tree. Consequentially, frames assigned to different VLANs
will follow different data routes within administratively established regions on the network, continuing to allow simple
and full processing of frames, regardless of administrative errors in defining VLANs and their respective spanning
trees.
DGS-3000 Series Gigabit Ethernet Switch Web UI Reference Guide
Figure 4-28 Layer 2 Protocol Tunneling Settings window
Description
Click to enable or disable the Layer 2 protocol tunneling state.
Use the drop-down menus to select a range of ports to use in the configuration.
Select the port type.
UNI - Specify the ports as UNI ports.
NNI - Specify the ports as NNI ports.
None - Disable tunnel on the port.
Select tunneled protocols on the UNI ports.
STP - Specify to use the STP protocol.
GVRP - Specify to use the GVRP protocol.
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 - All tunnel enabled Layer 2 protocols will be tunneled on the ports.
Enter the drop threshold for packets-per-second accepted on the UNI ports. The ports
drop the PDU if the protocol's threshold is exceeded.
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