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XS712T Smart Switch
CST Configuration
Use the CST Configuration screen to configure Common Spanning Tree (CST) and Internal
Spanning Tree on the switch.
To configure CST settings:
1. Select Switch
ing STP Advanced CST Configuration.
2. Specify values for CST in the appropriate fields:
• Bridge
Priority. 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. Specifies the bridge priority value for the Common and Internal
Spanning Tree (CST). The valid range is 0–61440. The bridge priority is a multiple of
4096. If you specify a priority that is not a multiple of 4096, the priority is automatically
set to the next lowest priority that is a multiple of 4096. For example, if the priority is
attempted to be set to any value between 0 and 4095, it will be set to 0. The default
priority is 32768.
• Bridge
Max Age (secs). 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 valid range is 6–40, and 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 default value is 20.
• Bridge
Hello Time (secs). Specify the switch Hello time for the Common and Internal
Spanning Tree (CST), which indicates the amount of time in seconds a root bridge
waits between configuration messages. The value is fixed at 2 seconds.
• Bridge
Forward Delay (secs). Specify the switch forward delay time, which indicates
the amount of time in seconds a bridge remains in a listening and learning state
before forwarding packets. The value must be greater or equal to (Bridge Max Age /
2) + 1. The time range is from 4 seconds to 30 seconds. The default value is 15.
• S
panning Tree Maximum Hops. Specify the maximum number of bridge hops the
information for a particular CST instance can travel before being discarded. The valid
range is 6–40