D-Link DSA-3200 Technical Information download pdf (Page 108)

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DGS-3200 Series Layer 2 Managed Gigabit Ethernet Switch Web UI Reference Guide

NOTE: The Bridge Hello Time cannot be longer than the Bridge Max Age. Otherwise, a

configuration error will occur. Observe the following formulas when setting the above

parameters:

Bridge Max Age <= 2 x (Bridge Forward Delay - 1 second)

Bridge Max Age > 2 x (Bridge Hello Time + 1 second)

Configure the following parameters for STP:

Parameter Description

STP Status

Use the radio button to globally enable or disable STP.

STP Version

Use the drop-down menu to choose the desired version of STP:

STP - Select this parameter to set the Spanning Tree Protocol (STP) globally on the

switch.

RSTP - Select this parameter to set the Rapid Spanning Tree Protocol (RSTP) globally on

the Switch.

MSTP - Select this parameter to set the Multiple Spanning Tree Protocol (MSTP) globally

on the Switch.

Forwarding BPDU This field can be Enabled or Disabled. When Enabled, it allows the forwarding of STP

BPDU packets from other network devices. The default is Enabled.

Bridge Max Age (6 –

40)

The Max Age may be set to ensure that old information does not endlessly circulate

through redundant paths in the network, preventing the effective propagation of the new

information. Set by the Root Bridge, this value will aid in determining that the Switch has

spanning tree configuration values consistent with other devices on the bridged LAN. The

user may choose a time between 6 and 40 seconds. The default value is 20 seconds.

Bridge Hello Time (1 –

The Hello Time can be set from 1 to 2 seconds. This is the interval between two

transmissions of BPDU packets sent by the Root Bridge to tell all other switches that it is

indeed the Root Bridge. This field will only appear here when STP or RSTP is selected for

the STP Version. For MSTP, the Hello Time must be set on a port per port basis. The

default is 2 seconds.

Bridge Forward Delay

(4 – 30)

The Forward Delay can be from 4 to 30 seconds. Any port on the Switch spends this time

in the listening state while moving from the blocking state to the forwarding state. The

default is 15 seconds

TX Hold Count (1-10)

Used to set the maximum number of Hello packets transmitted per interval. The count can

be specified from 1 to 10. The default is 6.

Max Hops (6-40)

Used to set the number of hops between devices in a spanning tree region before the

BPDU (bridge protocol data unit) packet sent by the Switch will be discarded. Each switch

on the hop count will reduce the hop count by one until the value reaches zero. The Switch

will then discard the BPDU packet and the information held for the port will age out. The

user may set a hop count from 6 to 40. The default is 20.

New Root Trap Used to enable or disable the sending of new root traps. The default is Enabled.

Topology Change Trap Used to enable or disable the sending of topology change traps. The default is Enabled.

Click Apply to implement changes made.

STP Port Settings

STP can be set up on a port per port basis.

To view the following window, click L2 Features > Spanning Tree > STP Port Settings:

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D-Link DSA-3200 Technical Information Page 108

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