D-Link xStack DXS-3350SR Installation & User Manual - page 73
DXS-3350SR Gigabit Layer 3 Switch
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 three choices:
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.
Hello Time: (1 - 10 sec) <2>
The Hello Time can be set from 1 to 10 seconds. When using 802.1d STP 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. For 802.1w
RSTP, the BDPU is sent by the Designated Port to identify it to other ports.
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. See
the MST Port Settings section for further details.
Max Age: (6 - 40 sec) <20>
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.
Forward Delay: (4 - 30 sec)
<15 >
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.
Max Hops (1-20) <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 (1-10) <3>
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 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.
Click Apply to implement changes made.
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