D-Link DES-3028 User Manual - Stp Bridge Global Settings

DES-3028 DES-3028P DES-3052 DES-3052P Layer 2 Fast Ethernet Managed Switch 

STP Bridge Global Settings 

To open the following window, open Spanning Tree in the L2 features folder and click the STP Bridge Global Settings link. 

Figure 7- 16. STP Bridge Global Settings window 

The following parameters can be set: 

Parameter                             Description 

Spanning Tree Protocol 

Use the pull-down menu to enable or disable STP globally on the Switch. The 

default is Disabled. 

Bridge Max Age (6 - 40 

Sec)

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. If the value ages out and a BPDU has still not 

been received from the Root Bridge, the Switch will start sending its own BPDU to 

all other switches for permission to become the Root Bridge. If it turns out that 

your switch has the lowest Bridge Identifier, it will become the Root Bridge. The 

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

Bridge Hello Time(1 - 10 

Sec)

The Hello Time can be set from 1 to 10 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.  

Bridge Forward Delay (4 

- 30 Sec)

The Forward Delaycan 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 for-

warding state. 

Max Hops (1-20) 

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 1 to 20. The 

default is 20. 

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