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layer 3 EtherChannel explaination

I have these two switches with thier configuratios

Switch1:

interface FastEthernet0/10

switchport trunk encapsulation isl

no ip address

channel-group 1 mode desirable

!

interface FastEthernet0/11

switchport trunk encapsulation isl

no ip address

channel-group 1 mode desirable

!

interface FastEthernet0/12

switchport trunk encapsulation isl

no ip address

channel-group 1 mode desirable

!

interface Port-channel1

switchport trunk encapsulation isl

Switch2:

interface FastEthernet0/10

switchport trunk encapsulation isl

no ip address

channel-group 1 mode auto

!

interface FastEthernet0/11

switchport trunk encapsulation isl

no ip address

channel-group 1 mode auto

!

interface FastEthernet0/12

switchport trunk encapsulation isl

no ip address

channel-group 1 mode auto

!

interface Port-channel1

switchport trunk encapsulation isl

Pitfall:

((To ensure that all member interfaces maintain the exact same configuration put them in the channel with the channel-group interface command, then apply all subsequent configuration to the port-channel interface.

Note that for layer 3 EtherChannel configurations, member

interfaces must first be designated as routed interfaces before being

put them in the channel-group)).

I am looking for explaination for this phrase in pitfall :(Note that for layer 3 EtherChannel configurations, member

interfaces must first be designated as routed interfaces before being

put them in the channel-group)?

1 REPLY
Super Bronze

Re: layer 3 EtherChannel explaination

Hi

Basically you have two types of real ports on a switch - routed and switched. Switched ports are for PCs/trunk links and so on, whereas a routed port is like a real router interface with an IP address etc.

You switch a port to a switchport using the 'switchport' command, or to a routed one by entering 'no switchport'.

What the pitfall note is saying is that if you want to have an L3 (or routed) Etherchannel, each port must get the 'no switchport' command before the 'channel-group' commmand.

Your config has ports with 'switchport' enabled, so it is a layer 2 etherchannel.

Aaron

Aaron Please remember to rate helpful posts to identify useful responses, and mark 'Answered' if appropriate!
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