I am in the process if connecting two 3750's, each with 2 1GB uplinks, to the copper 10/100/1000 ports on a 4507R.
I have split the uplinks from the two 3750's into two seperate cards on the 4507 and have set-up a port-group with the following configuration:
interface Port-channel2
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
end
I have then applied this to the physical ports on the 4507, which has now got four 10/100/1000 ports with the following configuration:
interface GigabitEthernet5/31
switchport trunk encapsulation dot1q
switchport mode trunk
speed 1000
channel-group 2 mode desirable
end
I am able to get one of the 3750's to create a bundle and appear as a 2GB interface, but when I try to connect the second 3750, the ports on both ends go into a 'suspend' state.
The logs on the 3750 states that one of the uplink ports is not compatible with the other.
Is there a restriction on the number of physical ports allowed in the port-channel interface ?
Any help appreciated.
Thanks.