Nexus 5548UP lacp with IBM AIX P740

Question

We are currently working in a lab to configure our first pair of 5548UP(with a 2232PP on each) with FCoE to an IBM p740 AIX server.  On the Nexus side I have confugured the physical port e100/1/1 (2232pp) to be in a channel-group that will be part of a vpc with the other 5548UP switch, I am trunking all vlans in the etherchannel with the IBM server.  Everything is working, i have the port-channel UP, the vfc and vpc when I use ''channel-group x mode ON'' on the physical ports and on the server side the 803.2ad is not active, it's configured ''roundRobin''. 
Suppose I want to use LACP for the connections with the server should I configure the Nexus switch port with ''channel-group x mode active'' or ''channel-group x mode passive''?  When the server is configured with ''802.3ad'' enabled and when I have ''channel-group x mode active'' or ''passive'' it doesn't work, the port-channel x does not come UP.
Does anyone have an explenation of how I should be configure?
Thanks

Answer 1

Hello,
Using LACP passive or active mode should not make much of a difference as long as one of the sides of the port-channel actively negotiates LACP.  In most cases, we just configure both sides to be LACP active.
When you say the port-channel is not working when using LACP, what are the symptoms?
Are the physical ports in "I" state?'
'show port-channel summary' will show this
What does the output of "show lacp counters interface port-channel X"  show?
This command will tell you if the Nexus 5K/2K is receiving LACPDUs from the IBM device (and if we are sending them).  I would suggest to collect the LACP counters to verify that we are receiving the LACP packets from IBM, otherwise Nexus will not bring up the port-channel.  Here is an example output from my lab switch:
5548-2019# show lacp counters interface port-channel 500
                    LACPDUs         Marker      Marker Response    LACPDUs
Port              Sent   Recv     Sent   Recv     Sent   Recv      Pkts Err
port-channel500
Ethernet1/15       16401  16399    0      0        0      0        0
Ethernet1/16       16400  16399    0      0        0      0        0
Regards,
Steven