Chapter 5
Configuration Using the Web-based Utility
35
24/48-Port 10/100 + 4-Port Gigabit Resilient Clustering Smart Switch with 2 Combo SFPs
Topology Changes Counts The total amount of STP
state changes that have occurred.
Last Topology Change The elapsed time since the bridge
was initialized or reset, and the last topographic change
occurred. The time is displayed in a day hour minute
second format, for example, 2 days 5 hours 10 minutes
and 4 seconds.
Spanning Tree > Global STP
The Global STP screen contains global parameters for STP
on the Switch.
Spanning Tree > Global STP
Global Setting
Spanning Tree State Select Enable or Disable from the
drop-down menu to enable or disable STP on the Switch.
The default is Enable.
BPDU Handling Determines how BPDU packets are
managed when STP is disabled on the port or Switch.
BPDUs are used to transmit spanning tree information.
The possible values are:
Filtering Filters BPDU packets when spanning tree is
disabled on an interface.
Flooding Floods BPDU packets when spanning tree is
disabled on an interface. This is the default value.
Path Cost Default Values The method used to assign
default path costs to STP ports. The possible values are:
Short Specifies a range of 1-65,535 for port path
costs.
Long Specifies a range of 1-200,000,000 for port path
costs. The default path costs assigned to an interface
varies according to the selected method. This is the
default value.
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Bridge Settings
Priority Specifies the bridge priority value. When
switches or bridges are running STP, each is assigned a
priority. After exchanging BPDUs, the device with the
lowest priority value becomes the Root Bridge. The default
value is 32768. The value must be a multiple of 4096. For
example, 4096, 8192, 12288, etc. The range is 0 to 65535.
Hello Time Specifies the device Hello Time (the amount of
time in seconds a root bridge waits between configuration
messages). The default is 2 seconds. The range is 1 to 10
seconds.
Max Age Specifies the device Maximum Age Time (the
amount of time in seconds that a bridge waits before
sending configuration messages). The default is 20
seconds. The range is 6 to 40 seconds.
Forward Delay Specifies the device forward delay time
(the amount of time in seconds a bridge remains in a
listening and learning state before forwarding packets).
The default is 15 seconds. The range is 4 to 30 seconds.
Choose settings for the Hello Time, Max Age, and Forward
Delay parameters so that both of the following are true:
Max Age ≥ 2 × (Hello Time + 1)
2 × (Forward Delay – 1) ≥ Max Age
Click Save Settings to save the changes, or Cancel
Changes to cancel the changes.
Spanning Tree > STP Port Settings
The STP Port Settings screen allows network administrators
to assign STP settings to specific interfaces.
Spanning Tree > STP Port Settings
Interface Indicates the port or LAG on which STP is
enabled. Select either Port (default) or LAG, then select
the interface from the drop-down menu.
Enable STP Select this to enable STP on the port. The
default is Enabled.
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