Trying to create a Etherchannel wtih sub interfaces to support VLAN inter-routing between 3825 ESM module to 3750 G 1RU switch. I can create the etherchannel between the 3825 and 3750 without subinterfaces and etherchannel works fine and can assign it to a VLAN.
But now the requirement has changed and customer wants to inter-route vlans across the etherchannel. Took the router on a stick approach across the ehterchannel but subinterface support doesn't seem possible.
I created the etherchannel with subinterfaces fine on the 3825 but when i add the physical interfaces into my ether-channels my config deletes the subinterfaces and defaults back to a plain vanillia port-channel interface. Below are the IOS i'm working with. It appears this configuration isn't supported on the ESM module but no warning given in software
Cisco 3825 Router
Cisco 3750G Switch