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NXA-ENET24 - Software Management Guide
Spanning Tree Commands (Cont.)
Command Function
spanning-tree forward-time
This command configures the
spanning tree bridge forward
time globally for this switch.
Use the no form to restore the
default.
Syntax:
spanning-tree forward-time seconds
no spanning-tree forward-time
• seconds - Time in seconds. (Range: 4-30 seconds). The minimum value
is the higher of 4 or [(max-age / 2) + 1].
Default Setting: 15 seconds
Command Mode: Global Configuration
Command Usage: This command sets the maximum time (in seconds) the
root device will wait before changing states (i.e., discarding to learning to
forwarding). This delay is required because every device must receive
information about topology changes before it starts to forward frames. In
addition, each port needs time to listen for conflicting information that would
make it return to the discarding state; otherwise, temporary data loops
might result.
Example:
Console(config)#spanning-tree forward-time 20
Console(config)#
spanning-tree hello-time
This command configures the
spanning tree bridge hello time
globally for this switch.
Use the no form to restore the
default.
Syntax:
spanning-tree hello-time time
no spanning-tree hello-time
• time - Time in seconds. (Range: 1-10 seconds). The maximum value is
the lower of 10 or [(max-age / 2) -1].
Default Setting: 2 seconds
Command Mode: Global Configuration
Command Usage: This command sets the time interval (in seconds) at
which the root device transmits a configuration message.
Example:
Console(config)#spanning-tree hello-time 5
Console(config)
spanning-tree max-age
This command configures the
spanning tree bridge maximum
age globally for this switch.
Use the no form to restore the
default.
Syntax:
spanning-tree max-age seconds
no spanning-tree max-age
• seconds - Time in seconds. (Range: 6-40 seconds)
The minimum value is the higher of 6 or [2 x (hello-time + 1)].
The maximum value is the lower of 40 or [2 x (forward-time - 1)].
Default Setting: 20 seconds
Command Mode: Global Configuration
Command Usage: This command sets the maximum time (in seconds) a
device can wait without receiving a configuration message before
attempting to reconfigure. All device ports (except for designated ports)
should receive configuration messages at regular intervals. Any port that
ages out STA information (provided in the last configuration message)
becomes the designated port for the attached LAN. If it is a root port, a new
root port is selected from among the device ports attached to the network.
Example:
Console(config)#spanning-tree max-age 40
Console(config)#