How does upstream and downstream port channel work in 802.11ac APs and clients?
AP support 802.3ad (LACP) as well as Static Port channel.
Packets are sprayed from Controller to both Ethernet ports of AP.
AP re-orders packets and delivers to wireless clients (in-order delivery) made possible by per-STA per-TID sequencing in GRE header for data packets from Controller.
Packets spraying based on Destination MAC of packet (hashed to 2 buckets statically).