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86 Converged Enhanced Ethernet Administrator’s Guide
53-1002163-02
LACP troubleshooting tips
8
DRAFT: BROCADE CONFIDENTIAL
• Make sure that LACPDUs are being received and transmitted on both ends of the link and that
there are no error PDUs. This can be verified by entering the show lacp counters
port-channel-num command and looking at the receive mode (rx) and transmit mode (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. If the PDU tx count is not
incrementing, check the operational status of the link by entering the show interface link-name
command and verifying that the interface status is “up.”
If a Brocade-based dynamic 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 Brocade for trunk type.
• Make sure that both ends of the link are not configured for passive mode. They must be
configured as either active/active, active/passive, or passive/active.
• 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.
• Make sure that the links that are part of the LAG are connected to the same neighboring
switch.
• Make sure that the system ID of the switches connected by the link is unique. This can be
verified by entering the show lacp sys-id command on both switches.
• 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 Brocade-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 Brocade 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.