Unanswered Question
Oct 27th, 2009


What is the difference is L2 Etherchannel Vs L3 EtherChannel.

I have this problem too.
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Jerry Ye Tue, 10/27/2009 - 13:22

L2 etherchannel is a switch port and L3 etherchannel is a routed port.

L2 etherchannel can carry STP and trunking information like 802.1q. No IP address is required to assign on interface Port-Channel.

L3 etherchannel, you will need to configure IP address on it.



nasr.khan Tue, 10/27/2009 - 13:37


Server has 3NIC and requirement is to have high speed connection. Each NIC is 10/100/1000 with redundancy.

L3 Etherchannel is suitable for this requirement. But L3 Etherchannel also has other option, which suits best for this??


Server IP :

thotsaphon Tue, 10/27/2009 - 13:51


In case you want to connect the server(3Nics) with the switch. I'd better go for Layer2 EtherChannel. The server needs to do a teaming for 3 interfaces. The switch side is configured the L2 Etherchannel(Access-Vlan) for that. Why Layer2? Because we always configure the gateway on L3 device. (grin)



nasr.khan Tue, 10/27/2009 - 13:58

What steps are required on cisco switch in terms of config.

assuming 3NIC is connected to 3ports on the switch.

thotsaphon Tue, 10/27/2009 - 14:14


It depends on which teaming modes on your server are supported. Assuming that Your server supports LACP for teaming NICs. The switch side has to be configured in this mode as well. The following command is for the switch.

==LACP== Let's assume that the server is in VLAN 10


Switch# configure terminal

Switch(config)# interface range gigabitethernet0/1 -3

Switch(config-if-range)# switchport mode access

Switch(config-if-range)# switchport access vlan 10

Switch(config-if-range)# channel-group 5 mode active

Switch(config-if-range)# end


You should use the link posted by the other poster to understand what LACP does for us.




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