CLI Reference Guide-R01

Chapter 19 | Spanning Tree Commands
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◆ When configured for manual release mode, then a link down / up event will not
release the port from the discarding state. It can only be released using the
spanning-tree loopback-detection release command.
Example
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree loopback-detection release-mode manual
Console(config-if)#
spanning-tree
loopback-detection
trap
This command enables SNMP trap notification for Spanning Tree loopback BPDU
detections. Use the no form to restore the default.
Syntax
[no] spanning-tree loopback-detection trap
Default Setting
Disabled
Command Mode
Interface Configuration (Ethernet, Port Channel)
Example
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree loopback-detection trap
spanning-tree
restricted-tcn
This command prevents a TCNs from being propagated from a switch port to other
ports. Use the no form to restore the default setting.
Syntax
[no] spanning-tree restricted-tcn
Default Setting
Disabled
Command Mode
Interface Configuration (Ethernet, Port Channel)
Commnad Usage
This command prevents a switch from propagating Topology Change Notifications
(TCNs) to other ports on the switch.