D-Link DGS-3120-24TC Product Manual - Page 87

STP Status, STP Version, Forwarding BPDU, Bridge Max Age 6 - 40, Bridge Hello Time 1

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xStack® DGS-3120 Series Managed Switch Web UI Reference Guide Figure 4-28 STP Bridge Global Settings window The fields that can be configured are described below: Parameter Description 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) 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 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 6 to 40. The default is 20. 79

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xStack® DGS-3120 Series Managed Switch Web UI Reference Guide
79
Figure 4–28 STP Bridge Global Settings window
The fields that can be configured are described below:
Parameter
Description
STP Status
Use the radio button to globally enable or disable STP.
STP Version
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.
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
.
Bridge Max Age (6 – 40)
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.
Bridge Hello Time (1 –
2)
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.
Bridge Forward Delay
(4 – 30)
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
Tx Hold Count (1-10)
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
.
Max Hops (6-40)
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
6
to
40
. The
default is
20
.