Stp Bridge Global Settings - D-Link xStack Reference Manual

xStack® DGS-3120 Series Layer 2 Stackable Managed Switch Web UI Reference Guide

STP Bridge Global Settings

On this page the user can configure the STP bridge global parameters.
To view the following window, click L2 Features > Spanning Tree > STP Bridge Global Settings, as show below:
The fields that can be configured are described below:
Parameter
STP Status
STP Version
Forwarding BPDU
Bridge Max Age (6 – 40)
Bridge Hello Time (1 – 2)
Bridge Forward Delay
(4 – 30)
Tx Hold Count (1-10)
Max Hops (6-40)
Figure 4-25 STP Bridge Global Settings window
Description
Use the radio button to globally enable or disable STP.
Use the pull-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.
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.
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.
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.
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
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.
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
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