Unable to establish port-channel with Jumbo Frames on Cisco 3130G

We have a Dell M1000e enclosure with (4) Cisco 3130G switch blades installed.

For the (2) switch blades that are to connect to the iSCSI arrays we have set the system MTU to 9000 bytes, and assign each of the Gigabit Ethernet ports to a VLAN of 100.

When we attempt to set up a port-channel to aggregate the bandwidth, the port-channel fails to setup. When we checked the causeof the failure. It seems that the port-channel mtu remains at a MTU of 1500 bytes.

Does anyone have an idea of how to correct this?
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Marius GunnerudSenior Systems EngineerCommented:
you have changed the  MTU on all interfaces to participate in the ether-channel?

Are you shutting down the interfaces to be placed in the ether-channel before creating the ether-channel? Try doing that.  shut down the interfaces create the ether-channel and then bring the interfaces back up.
j2luceAuthor Commented:
The interfaces themselves all have the jumbo MTU of 9000 set through the global command. If you remove the etherchannel setup (no port-channel xx), the ports themselves are shutdown. I then set up the etherchannel by using the command "group-channel xx mode on" command. I then run the "no shutdown" command, on each port. The etherchannel initially comes up and then err-disables itself after 20-25 seconds.
Marius GunnerudSenior Systems EngineerCommented:
are all interfaces configured exaclty the same?  I am not just talking about the ether-channel but all other commands?

check spanning tree, perhaps there is a port not in forwarding state when setting up the ether-channel.
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j2luceAuthor Commented:
Turns out that you can not trunk cross-switch with the 3130G and the Cisco 4900Ms.
While we were able to do it with our Cisco 4500s and the 3130G, it turns out that it can not be done with some switches. Found that statement in the documentation for the 3100 series blade switches. So we reconfigured our wiring so everything is going to the same switch module and it works!

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Marius GunnerudSenior Systems EngineerCommented:
Good stuff! Thanks for the update.
j2luceAuthor Commented:
I did not submit everything we did however we found the answer without much additional help
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