show stpd ports non-forwarding-reason

show stpd stpd_name ports {port_list} { non-forwarding-reasons }

Description

Displays the reasons for placing a port in a non-forwarding state.

Syntax Description

stpd_name Specifies an STPD (Spanning Tree Domain) name on the switch.
port_list Specifies one or more ports or slots and ports.
non-forwarding-reasons Displays only reasons for placing a port in a non-forwarding state.

Default

N/A

Usage Guidelines

Ports can be placed in the non-forwarding state for the following reasons:
  • Placed in listening state because it is in dispute.
  • Not been placed in a non-forwarding state due to any exceptional condition.
  • Placed in listening or blocking state by the Loop Protect feature.
  • Placed in listening state by the Loop Protect feature, but this condition may be normal because the link partner does not support Loop Protect.
  • Placed in blocking state because a loopback condition has been detected.
  • Unknown non-forwarding reason.

Example

The following example displays the non-forwarding reasons on port 1:10 in STP (Spanning Tree Protocol) domain r1:

show stpd r1 ports 1:10 non-forwarding-reason


Port        Reason
----------------------------------------------------------------------------------------                                                   
1:1         Placed in listening state because it is in dispute.
1:2         Not been placed in a non-forwarding state due to any exceptional condition.
1:3         Placed in listening or blocking state by the Loop Protect feature.
1:4         Placed in listening state by the Loop Protect feature, but this condition
            may be normal because the link partner does not support Loop Protect.
1:5         Placed in blocking state because a loopback condition has been detected.
1:6         Unknown non-forwarding reason.        
      

History

This command was first available in ExtremeXOS 15.7.1.

Platform Availability

This command is available on the Summit X450-G2, X460-G2, X670-G2, X770, and ExtremeSwitching X440-G2, X620, X690, X870 series switches.