Stp Bridge Global Settings - D-Link xStack DES-3200 Series Reference Manual

802.1D-1998/802.1D-2004/802.1Q-2005 Compatibility
MSTP or RSTP can interoperate with legacy equipment and is capable of automatically adjusting BPDU packets to
802.1D-1998 format when necessary. However, any segment using 802.1D-1998 STP will not benefit from the
rapid transition and rapid topology change detection of MSTP or RSTP. The protocol also provides for a variable
used for migration in the event that legacy equipment on a segment is updated to use RSTP or MSTP.
The Spanning Tree Protocol (STP) operates on two levels:
1. On the switch level, the settings are globally implemented.
2. On the port level, the settings are implemented on a per-user-defined group of ports basis.

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 State
STP Version
Forwarding BPDU
Bridge Max Age (6-40)
Bridge Hello Time (1-2)
xStack® DES-3200 Series Layer 2 Managed Fast Ethernet Switch
Figure 4-22 STP Bridge Global Settings window
Description
Use the radio button to globally enable or disable STP.
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.
This field can be Enabled or Disabled. When Enabled, it allows the forwarding of
STP BPDU packets from other network devices. The default is Disabled.
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.
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