Switching
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XS728T ProSAFE 28-Port 10-Gigabit L2+ Smart Switch
The following table describes the STP Status information displayed on the screen.
Field Description
Bridge Identifier The bridge identifier for the CST. It is made up using the bridge priority and
the base MAC address of the bridge.
Time Since Topology Change The time in seconds since the topology of the CST last changed.
Topology Change Count The number of times the topology has changed for the CST.
Topology Change The value of the topology change parameter for the switch indicating if a
topology change is in progress on any port assigned to the CST
. The value is
either True or False.
Designated Root The bridge identifier of the root bridge. It is made up from the bridge priority
and the base MAC address of the bridge.
Root Path Cost Path cost to the designated root for the CST.
Root Port Port to access the Designated Root for the CST.
Max Age (sec) Specifies the bridge maximum age for CST. The value must be less than or
equal to (2 X bridge forward delay) – 1 and greater than or equal to 2 X
(bridge hello time +1).
Forward Delay (sec) Derived value of the root port bridge forward delay parameter.
Hold Time (sec) Minimum time between transmission of configuration BPDUs.
CST Regional Root Priority and base MAC address of the CST regional root.
CST Path Cost Path cost to the CST tree regional root.
CST Configuration
To configure Common Spanning Tree (CST) and Internal Spanning Tree on the switch, use
the CST Configuration screen.
To configure CST settings:
1. Select Switching > STP > Advanced > CST Configuration.
2. Specify values for CST in the following fields:
• Bridge Priority. Specify the bridge priority value for the Common and Internal
Spanning
Tree (CST). When switches or bridges are running STP, each is assigned a
priority. After exchanging BPDUs, the switch with the lowest priority value becomes
the root bridge. The bridge priority is a multiple of 4096.
• Bridge Max
Age (Sec). Specify the bridge maximum age time for the Common and
Internal Spanning Tree (CST), which indicates the amount of time in seconds a bridge
waits before implementing a topological change. The value must be less than or
equal to (2 * bridge forward delay) – 1 and greater than or equal to 2 * (bridge hello
time +1). The valid range is 6–40, and the default value is 20.
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