Etherchannel between two CISCO switches.

This how to shows how to setup Etherchannel links between two switches. A trunk link was first established between the two switches and then the Etherchannel links were created using the PAgP protocol. You can download the PacketTrace file from here.

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The following commands will create a trunk between the two switches. You can run the command on only one switch.

 
switchport fastEthernet 0/1
switchport mode trunk
switchport trunk allowerd vlan 1-99,150 #in case you have VLANS

The following commands will need to be run on both switches.

 
interface  range  fastEthernet  0/1-4
channel-protocol  pagp
channel-group 1 mode  desirable

The following modes are available.

1
2
3
4
5
6
channel-group 1 mode ?
active Enable LACP unconditionally
auto Enable PAgP only if a PAgP device is detected
desirable Enable PAgP unconditionally
on Enable Etherchannel only
passive Enable LACP only if a LACP device is detected
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