Use this command to display the reason for placing a port in a non-forwarding state due to an exceptional condition.
| port-string | (Optional) Specifies port(s) for which to display the non-forwarding reason. For a detailed description of possible port-string values, refer to Port String Syntax Used in the CLI in the S-, K-, and 7100 Series Configuration Guide. |
| sid sid | (Optional) Specifies the specific Spanning Tree(s) for which to display the non-forwarding reason. Valid values are 0 - 4094. If not specified, SID 0 is assumed. |
If no port-string is specified, non-forwarding reason is displayed for all ports.
If no SID is specified, SID 0 is assumed.
All command modes.
Exceptional conditions causing a port to be placed in listening or blocking state include a Loop Protect event, receipt of disputed BPDUs, and loopback detection.
This example shows how to display the non-forwarding reason on ge.1.1:
System(rw)->show spantree nonforwardingreason port ge.1.1 Port ge.1.1 has not been placed in a non-forwarding state on SID 0 due to any exceptional condition.
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