Port Channels

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Fast EtherChannel (FEC)
Gigabit EtherChannel (GEC)

Configuration

config-if# channel-group 1 mode on

Load Balancing

config# port-channel load-balance <type>

Discovery

Port Aggregation Protocol (PAgP)

config-if# channel-group 1 mode [auto| desirable]

Link Aggregation Control Protocol (LACP)

config-if# channel-group 1 mode [active|passive]

Requirements

Same speed and Duplex
If not trunking then same access VLAN
If trunking, same trunk type, same allowed VLANs and same native VLAN
Same STP cost per VLAN on all links in channel
No SPAN & RSPAN