Ether channel or Port channels

Ether channel, which is also known as link aggregation or Port channel.
Ether channel bundle multiple phisical link to make a single logical link.
Ether channel can be used for load balancing or load sharing and fault tolerance.
Ether channel or Port channel have three mode LACP, PAgP and ON MODE.
Ether channel increase bandwith , increase availablity and load sharing.
Required same duplex, native Vlan and allow vlan and switch mode should be same .
Layer 2 distribution on source and destination Mac
Layer 3 distribution on source and destination IP address
Min link 2 required and Max 8 interface
Ether channel configure switch to switch and switch to servers.

LACP is the open standard 802.3ad.
-Same speed and duplex
-Must be in same vlan
Same operational mode.
You have up to 16 port in LACP ether channel but 8 only can be active at one time.
- -one site active -other side active -its work
- -one site active -other side passive -its work
-- one site passive -other side passive -its not work

Configuration LACP

-Its cisco proprietory its work in same like LACP

--One switch side auto and second switch side desirable - work
--One switch side desirable and second switch side desirable - work
--on - no protocols are used: it assumes the other side has enabled Link aggregation

Switch-1

Switch-2

show etherchannel summary: This command displays a summary of EtherChannel information, including the status and configuration of EtherChannels on the switch.