D-Link xStack DES-3800 Series User Manual page 117

The following parameters can be set:
Parameter Description
STP Status Use the pull-down menu to enable or disable STP globally on the Switch. The default is Disabled.
STP Version Use the pull-down menu to choose the desired version of STP to be implemented on the Switch.
There are two choices:
STP compatable - 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.
Type in a value between 1 and 10 seconds to specify how often the switch will broadcast its hello
Hello Time
messages to other switches.
(1-10 Sec)
Max Age The Max Age may be set to ensure that old information does not endlessly circulate through
(6-40 Sec) 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.
Forward Delay The Forward Delay can be from 4 to 30 seconds. Any port on the Switch spends this time in the
(4-30 Sec) listening state while moving from the blocking state to the forwarding 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 BDPU 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.
TX Hold Count Used to set the maximum number of Hello packets transmitted per interval. The count can be
specified from 1 to 10. The default is 3.
Forwarding This field can be Enabled or Disabled. When set to Enabled, it allows the forwarding of STP
BPDU BPDU packets from other network devices. The default is Enabled.
Click Apply to implement changes made.
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