Brocade 6910 Ethernet Access Switch Configuration Guide (Supporting R2.2.0.0) - Manual (Page 387)

Brocade 6910 Ethernet Access Switch Configuration Guide 331
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Spanning Tree Commands
Example
This example shows how to enable the Spanning Tree Algorithm for the switch:
Console(config)#spanning-tree
Console(config)#
spanning-tree cisco-prestandard
This command configures spanning tree operation to be compatible with Cisco prestandard
versions. Use the no form to restore the default setting.
[no] spanning-tree cisco-prestandard
Default Setting
Disabled
Command Mode
Global Configuration
Command Usage
Cisco prestandard versions prior to Cisco IOS Release 12.2(25)SEC do not fully follow the IEEE
standard, causing some state machine procedures to function incorrectly. The command forces the
spanning tree protocol to function in a manner compatible with Cisco prestandard versions.
Example
Console(config)#spanning-tree cisco-prestandard
Console(config)#
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) a port 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.