12.
Spanning Tree Protocol (STP)
MN700004 Rev 01
115
PortPriority = 128
PortState = disabled
PortEnable = disabled
PortPathCost = 10
DesignatedRoot = 08192.00:A0:12:00:00:03
DesignatedCost = 19
DesignatedBridge = 32768.00:A0:12:11:29:82
DesignatedPort = 128.1
FrwrdTransitions = 0
TopChangeDetection = Enabled
device-name
(config-if 1/1/1)#
spanning-tree priority 100
2. Displaying the spanning-tree topology for all interfaces:
device-name
(cfg protocol)#
spanning-tree interface all
============================================================================
===
Port |Pri|State|PCost| Cost |Designated bridge |DPrt |FwrdT|DtctTc
--------+---+-----+-----+-------+------------------+------+-----+--------
01/01/01 128 listn 19 19 32768.00A012000003 128.01 2 Disabled
01/01/02 128 block 19 0 32768.000002030405 128.63 0 Enabled
01/01/03 128 listn 19 0 32768.000002030405 128.62 2 Enabled
device-name
(cfg protocol)#
spanning-tree line-error-detect
The
spanning-tree line-error-detect
enable
command, in Protocol Configuration mode,
switches the device to using the existing alternate (backup) link instead of the current link,
when the CRC errors on the line reach critical level. The error level is considered critical
when the CRC error rate exceeds 1% for a 3-seconds interval. The command triggers
reconfiguring of the Spanning Tree or the Rapid Spanning Tree, so it is effective only when
either STP or RSTP is enabled.
The
spanning-tree line-error-detect
disable
command disables detecting of CRC errors.
Command Syntax
device-name
(cfg protocol)#
spanning-tree
line-error-detect
{
enable
|
disable
}
Argument Description
enable
Enables detecting of CRC errors and STP/RSTP reconfiguring.
disable
Disables detecting of CRC errors.
STP Configuration Commands in Interface Configuration
Mode
spanning-tree all
The
spanning-tree all
command, in Interface Configuration mode, displays the current status
of spanning-tree parameters for all the switch’s logical interfaces. The command is equivalent