We are having a problem setting up a port channel/aggregated ethernet interface using two 1 gig connections between our Palo Alto (model 5020, PAN-OS 8.0) and a Cisco switch (model WS-C3750G-24T (IOS: 12.2(55)SE1). We have worked with TAC but can't seem to get this issue resolved.
(Most of the articles concerning lacp with PAN and cisco connections are pretty dated)
On the 3750 etherchannel, are you using ACTIVE, PASSIVE or ON (ie - channel-group 1 mode active)? Also, what packet distribution algorithm are you using on the 3750? Your options are dst-ip | dst-mac | src-dst-ip | src-dst-mac | src-ip | src-mac. I've done a lot of etherchannel work with the 3750 platform. Usually if you are "really" using LACP, you should be running your etherchannel with ACTIVE/SRC-DST-IP. There are scenarios (ie - old school ESXi) where you are forced to use "ON". One last word of advice. The 3750's are finicky. You should put your configs in the port-channel and let them trickly down to the interfaces. If everything doesn't match exactly, it may not work.
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