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Dell Converged Enhanced Ethernet Administrator’s Guide 73
53-1002116-01
LACP troubleshooting tips
7
• Make sure that LACPDUs are being received and transmitted on both ends of the link and
there are no error PDUs. This can be verified by entering the show lacp port-channel-num
counters command and looking at the rx and tx statistics. The statistics should be
incrementing and should not be at zero or a fixed value. If the PDU rx count is not
incrementing, check the interface for possible CRC errors by entering the show interface
link-name command on the neighboring switch.
• Make sure that the fiber length of the link has a deskew value of 7 microseconds. If it does not,
the link will not be able to join the LAG and the following RASLOG message is generated:
Deskew calculation failed for link <link-name>.
When a link has this problem, the show port-channel command displays the following:
Mux machine state : Deskew not OK.
If a Dell-based static trunk is configured on a link and the link is not able to join the LAG:
• Make sure that both ends of the link are configured as Dell for trunk type and verify that the
mode is “on.”
• Make sure that the port-channel interface is in the administrative “up” state by ensuring that
the no shutdown command was entered on the interface on both ends of the link.
If a standards-based static trunk is configured on a link and the link is not able to join the LAG:
• Make sure that both ends of the link are configured as standard for trunk type and verify that
the mode is “on.”
• Make sure that the port-channel interface is in the administrative “up” state by ensuring that
the no shutdown command was entered on the interface on both ends of the link.