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4 Configuration
L2 Features > Spanning Tree > STP Global Settings
The Switch implements two versions of the Spanning Tree Protocol: Rapid Spanning Tree Protocol (RSTP)
as defined by IEEE 802.1w, a version compatible with the IEEE 802.1D STP. RSTP can operate with legacy
equipment implementing IEEE 802.1D, however the advantages of using RSTP will be lost.
By default, Rapid Spanning Tree is disabled. If enabled, the Switch will listen for Bridge Protocol Data Unit
(BPDU) packets and their accompanying Hello Packets. The BPDU packets are sent even if a BPDU packet
is not received. Therefore, each connection between bridges is sensitive to the status of the link. Ultimately
this difference results in faster detection of failed links, and therefore faster topology adjustment.
The fields that can be configured are described below:
Item
Spanning Tree State
Spanning Tree State
Spanning Tree Mode
Spanning Tree Mode
STP Traps
STP New Root Trap
STP Topology Change
Traps
Click Apply to make the configurations take effect.
L2 Features > Spanning Tree > STP Port Settings
STP can be set up per port. In addition to setting Spanning Tree parameters for use on the switch level, the
Switch allows configuration of a spanning tree setup for a group of ports. Each port group spanning tree will
require separate configuration.
An STP Group spanning tree works in the same way as the switch-level spanning tree, but the root bridge
concept is replaced with a root port concept. The root port is selected based on the priority of and path cost
to the port. Redundant links will be blocked, just as redundant links are blocked on the switch level.
The STP on the switch level blocks redundant links between switches (and similar network devices). The
port level STP will block redundant links within an STP Group
Figure 4.42 - L2 Features > Spanning Tree > STP Global Settings
Description
Select to enable or disable the Spanning Tree Protocol.
Select the STP mode. The options to choose from are RSTP
and STP.
Select to enable or disable the STP new root trap option.
Select to enable or disable the STP topology change trap
option.
Table 4.23
D-Link Smart Managed Switch User Manual
30
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