D-Link DGS-3100 Defining Spanning Tree Global Parameters, 14. STP Bridge Global Settings Page

DGS-3100 Series Gigabit Stackable Managed Switch User Manual

Defining Spanning Tree Global Parameters

While Classic STP prevents Layer 2 forwarding loops in a general network topology, convergence can take between 30-60 seconds. This time may delay detecting possible loops and propagating status topology changes. Rapid Spanning Tree Protocol (RSTP) detects and uses network topologies that allow a faster STP convergence without creating forwarding loops.

When STP is enabled, Loopback Detection is also enabled. Loopback Detection identifies any Loopback BPDUs that the Spanning Tree application receives on a port. In this case, the device sends a Loopback Detection trap for the port. When the condition is resolved, the device sends a Loopback Detection Resolved trap and the port learns the STP configuration again.

The STP Bridge Global Settings Page contains parameters for enabling STP on the device.

1.Click L2 Features > Spanning Tree > STP Bridge Global Settings. The STP Bridge Global Settings Page opens:

	Figure 3–14. STP Bridge Global Settings Page
The STP Bridge Global Settings Page contains the following fields:
Field	Description
STP Status	Enable or disables STP globally on the switch. The default is Disabled.
STP Version	Defines the desired version of STP to be implemented on the switch. There are three
	choices:
	STP — Sets the Spanning Tree Protocol (STP) globally on the switch.
	RSTP — Sets the Rapid Spanning Tree Protocol (RSTP) globally on the switch.
	MSTP — Sets the Multiple Spanning Tree Protocol (MSTP) globally on the switch.
Forwarding BPDU	Bridges use Bridge Protocol Data Units (BPDU) to provide spanning tree information.
	STP BPDUs filtering is useful when a bridge interconnects two regions; each region
	needing a separate spanning tree. BPDU filtering functions only when STP is disabled
	either globally or on a single interface. The possible values are:
	Enabled – Allows the forwarding of STP BPDU packets from other network
	devices..

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