About EtherChannel:
- You can configure maximum 8 ports in single port-channel.
- All ports in the port-channel should be of same type (Fast Ethernet or Gigabit Ethernet), same speed, same duplex settings schweizer-apotheke.de. In addition, incase of trunk port-channel, same VLANs and native VLAN should be permitted. It is advisable to configure switchports on the port-channel interface rather than on each physical interface.
# config t
config)# interface range gigabit ethernet 0/51-52
config-if-range)# channel-group 1 mode active
(config-if-range)# channel-protocol 1 lacp
(config-if-range)# exit
(config)# interface port-channel 1
(config-if)# switchport trunk encapsulation dot1q
(config-if)# switchport mode trunk
(config-if)# end
You don’t need to specify Channel-protocol 1 lacp command because active keyword in channel-group 1 mode active instruct switch to form LACP aggregated link.
| Mode | Protocol | Description |
|---|---|---|
| On On | LACP PAgP | Links in this mode don't perform any protocol negotiation. It doesn't send or respond any frames sent by far-end switch. The other end of link should also be set to On to bring up the ether channel. |
| Active Auto | LACP PAgP | Links in this mode send and respond to frames in order to form aggregated link. |
| Passive Desirable | LACP PAgP | It doesn't initiate any frames but waits for first frame from far-end switch and then responds to initiate negotiation. |
Both end of the links should be On-On or Active-Passive or Auto-Desirable in order to bring up the ether channel. All other combination doesn’t bring up aggregated link.
