Supermicro SSE-G2252, User Manual

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Chapter 34: Spanning Tree Commands
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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
D
EFAULT
S
ETTING
Disabled
C
OMMAND
M
ODE
Global Configuration
C
OMMAND
U
SAGE
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.
E
XAMPLE
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.
S
YNTAX
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].
D
EFAULT
S
ETTING
15 seconds
C
OMMAND
M
ODE
Global Configuration
C
OMMAND
U
SAGE
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.