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How to troubleshoot why a LAG on Securestack or S-Series is not forming to neighbor device by reviewing LACP counters

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TitleHow to troubleshoot why a LAG on Securestack or S-Series is not forming to neighbor device by reviewing LACP counters
Objective
  • How to troubleshoot why a LAG on Securestack is not forming to neighbor device by reviewing LACP counters
  • Diagnose why ports are not joining the lag group
Environment
  • Securestack
  • S-Series
  • All firmware versions
Procedure
  • Review LACP port counters for LACPDUsRx and LACPDUsTx packets by issuing the following command:
Securestack(su)->show port lacp port ge.1.1 counters

Port Instance: ge.1.1
LACPDUsRx:                  0
LACPDUsTx:                118
IllegalRx:                  0
UnknownRx:                  0
MarkerPDUsRx:               0
MarkerPDUsTx:               0
MarkerResponsePDUsRx:       0
MarkerResponsePDUsTx:       0
  • In the output, we see that the port is transmitting (Tx) the LACPDU packets but we are not receiving (Rx) any from the neighboring switch or device
  • Review configuration of both devices inter-connected to ensure LACP is enabled
  • Additional troubleshooting commands:
Securestack(su)->show port lacp port ge.1.1 status detail
Securestack(su)->show port lacp port ge.1.1 status summary
Securestack(su)->show lacp LAG.0.X

 
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