Aggregated Ports (Notes)

Load Balancing
switch(config)# port-channel load-balance {src-ip|dst-ip|src-dst-ip|src-mac|dst-mac|src-dst-mac|src-port|dst-port|src-dst-port}
Method	Hash Operation		Switches
src-ip	bits		All Models
dst-ip	bits		All Models
src-dst-ip	XOR		All Models
src-mac	bits		All Models
dst-mac	bits		All Models
src-dst-mac	XOR		All Models
src-port	bits		4500, 6500
dst-port	bits		4500, 6500
src-dst-port	XOR		4500, 6500
For 2 links last one bit of the address will be chosen for hash operation
For 3-4 links last two bits will be choosen
For 5-8 links last three bits will be choosen
EtherChannel Negotiation Protocols
To provide some dynamic link configuration
PAgP	Cisco proprietary
	Modes	on|auto|desirable
		on - all ports channeling, no pagp packets will be exchanged
		auto - waits to channel until asked
		desirable - actively asks for
	PAgP forms EtherChannel only on ports that are configured for identical static vlans or trunk
	PAgP also modifies dynamically modifies parameters of EtherChannel if one of the bundled ports is modified
LACP	Standard	802.3ad
	Modes	on|passive|active
		on - all ports channeling, no lacp packets will be exchanged
		passive - waits to channel until asked
		active - actively asks for
	In addition to learning neighbor's port group capabilities and comparing with local port capabilities, LACP also assigns roles to EtherChannel endpoints.
	Switch with lowest system priority (2byte priority + 6byte MAC address) is allowed to make decisions on which ports actively are participating in EtherChannel at a given point of time
	In LACP upto 16 ports can be configured as members, with 8 being active at a time and rest being on standby. Should an active port go down, one of the standby ports become active.
	Active ports are selected based on port priority (2byte priority + 2byte port number) by the switch with lowest system priority.
	Lower value indicates high priority.
switch(config-if)# channel-protocol {lacp|pagp}
switch(config)# lacp system-priority <0-65535>
switch(config-if)# channel-group <no.> mode {on|desirable|auto|active|passive}
switch(config-if)# lacp port-priority <0-65535>
show etherchannel <no.>
show etherchannel load-balance
show etherchannel protocol
show ethterchannel {detail|summary}