On Feb 4, 2009, at 8:14 AM, Ronan Mullally wrote:
It's not possible to do cross-chassis LACP / PAGP, on stacked 3750Gs at least. The switches will tell you that all ports must be on the same physical switch (and give you a maximum of 12 port-channel interfaces, which for a 24 port switch makes sense).
This issue has been fixed in recent code releases IIRC. (We're running it in production, and I do remember having to upgrade to work around that issue.)
~Max