C
HAPTER
33
| Spanning Tree Commands
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EXAMPLE
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree link-type point-to-point
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).
â—† 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
release-mode
This command configures the release mode for a port that was placed in
the discarding state because a loopback BPDU was received. Use the no
form to restore the default.
SYNTAX
spanning-tree loopback-detection release-mode
{auto | manual}
no spanning-tree loopback-detection release-mode
auto - Allows a port to automatically be released from the
discarding state when the loopback state ends.
manual - The port can only be released from the discarding state
manually.
DEFAULT SETTING
auto
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