ECS4660-28F_Management Guide-R03

C HAPTER 38 | Spanning Tree Commands
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spanning-tree
loopback-detection
This command enables the detection and response to Spanning Tree
loopback BPDU packets on the port. Use the no form to disable this
feature.
SYNTAX
[no] spanning-tree loopback-detection
DEFAULT SETTING
Enabled
COMMAND MODE
Interface Configuration (Ethernet, Port Channel)
COMMAND USAGE
◆ If Port Loopback Detection is not enabled and a port receives it’s own
BPDU, then the port will drop the loopback BPDU according to IEEE
Standard 802.1W-2001 9.3.4 (Note 1).
◆ Port Loopback Detection will not be active if Spanning Tree is disabled
on the switch.
EXAMPLE
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree loopback-detection
spanning-tree
loopback-detection
action
This command configures the response for loopback detection to block user
traffic or shut down the interface. Use the no form to restore the default.
SYNTAX
spanning-tree loopback-detection action
{block | shutdown duration}
no spanning-tree loopback-detection action
block - Blocks user traffic.
shutdown - Shuts down the interface.
duration - The duration to shut down the interface.
(Range: 60-86400 seconds)
DEFAULT SETTING
block
COMMAND MODE
Interface Configuration (Ethernet, Port Channel)
COMMAND USAGE
◆ If an interface is shut down by this command, and the release mode is
set to “auto” with the spanning-tree loopback-detection release-mode