Problem with setting up etherchannel.

[proziumwtf]

I am trying to create an etherchannel between two switches 2970G and a 3750G 

The configuration of the interfaces is as follows :

interface Port-channel3
 switchport mode access
 macro description 3750G-16TD
!
interface GigabitEthernet2/0/1
 switchport trunk encapsulation dot1q
 switchport mode trunk
 switchport nonegotiate
 channel-group 3 mode active
!
interface GigabitEthernet2/0/2
 switchport trunk encapsulation dot1q
 switchport mode trunk
 switchport nonegotiate
 channel-group 3 mode active
!
interface GigabitEthernet2/0/3
 switchport trunk encapsulation dot1q
 switchport mode trunk
 switchport nonegotiate
 channel-group 3 mode active
!
interface GigabitEthernet2/0/4
 switchport trunk encapsulation dot1q
 switchport mode trunk
 switchport nonegotiate
 channel-group 3 mode active

When I connect the switches i get this message :

%EC-5-CANNOT_BUNDLE2: Gi2/0/4 is not compatible with Po3 and will be suspended (dtp mode of Gi2/0/4 is on, Po3 is off)
%EC-5-CANNOT_BUNDLE2: Gi2/0/3 is not compatible with Po3 and will be suspended (dtp mode of Gi2/0/3 is on, Po3 is off)

any idea how to fix the etherchannel ?

[Sajid Ali]

Issue seems with interface attribute, please check duplex and speed of both interfaces.

Error Message    EC-5-CANNOT_BUNDLE2: [chars] is not compatible with [chars] and will 
be suspended ([chars]).

Explanation    This message means that the interface has different interface attributes than other ports in the EtherChannel. For the interface to join the bundle (EtherChannel), change the interface attributes to match the EtherChannel attributes. The first [chars] is the interface to be bundled, the second [chars] is the physical interface that is already in the bundle, and the third [chars] is the reason for the incompatibility.

Recommended Action    Change the interface attributes to match the EtherChannel attributes.

[Xu Zhang]

Not sure if that was because the port-channel 3 configured as access port but the members port were configured as trunk port.

[Sajid Ali]

I am talking about Gi2/0/4 and Gi2/0/3, check duplex and speed of both interfaces same as GigabitEthernet 2/0/2 setting.

Sajid Ali Pathan