Configuring Switching Information
95
GS752TP, GS728TP, and GS728TPP Gigabit Smart Switches
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. 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 you set the priority to any value from 0 through
4095, it is set to 0. The valid range is 0–61440. The default priority is 32768.
• Bridge Max
Age (Sec). Specify the bridge maximum age time for the Common and
Internal Spanning T
ree (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.
• Bridge Hello T
ime (Sec). Specifies 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 (Sec). 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 valid range is 4–30 seconds.
The default value is 15.
• Spanning T
ree 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 1–40.
3. Click APPL
Y to send the updated configuration to the switch.
Configuration changes take place immediately.
The following table describes the MSTP Status information displayed on the CST
Configuration screen:
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