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Bridge Spanning Tree configuration
Spanning tree bridge parameters can be configured for each Spanning Tree Group. STP bridge
parameters include:
Bridge priority
Hello Time
Max Age
Forwarding delay
Current bridge configuration
The following table describes the Bridge Spanning Tree Configuration commands.
Table 110 Bridge Spanning Tree Configuration commands
Command
Description
spanning-tree stp <1-128> bridge
priority <0-65535>
Configures the bridge priority. The bridge priority parameter
controls which bridge on the network is the STP root bridge.
To make this switch the root bridge, configure the bridge priority
lower than all other switches and bridges on your network. The
lower the value, the higher the bridge priority. The range is 0 to
65535, and the default is 32768.
RSTP/MSTP: The range is 0 to 61440, in steps of 4096 (0, 4096,
8192...), and the default is 32768.
Command mode: Global configuration
Configures the bridge hello time. The hello time specifies how
often the root bridge transmits a configuration bridge protocol
data unit (BPDU).
Any bridge that is not the root bridge uses the root bridge hello
value. The range is 1 to 10 seconds, and the default is 2 seconds.
Command mode: Global configuration
Configures the bridge maximum age. The maximum age
parameter specifies the maximum time the bridge waits without
receiving a configuration bridge protocol data unit before it
reconfigures the STP network. The range is 6 to 40 seconds, and
the default is 20 seconds.
Command mode: Global configuration
Configures the bridge forward delay parameter. The forward
delay parameter specifies the amount of time that a bridge port
has to wait before it changes from the listening state to the
learning state and from the learning state to the forwarding state.
The range is 4 to 30 seconds, and the default is 15 seconds.
Command mode: Global configuration
Displays the current bridge STP parameters.
Command mode: All
spanning-tree stp <1-128> bridge
hello-time <1-10>
spanning-tree stp <1-128> bridge
maximum-age <6-40>
spanning-tree stp <1-128> bridge
forward-delay <4-30>
show spanning-tree stp <1-128>
bridge
When configuring STP bridge parameters, the following formulas must be used:
2*(fwd-1) > mxage
2*(hello+1) < mxage
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