On the Cisco:
Create a port-channel interface:
interface port-channel 1
switchport mode trunk
no ip address
no shutdown
Then put the physical interfaces in the channel group:
interface gi 0/1
switchport mode trunk
no ip address
channel-group 1 mode on
no shutdown
!
interface gi 0/2
switchport mode trunk
no ip address
channel-group 1 mode on
no shutdown
!
Always do any remaining configuration such as native and allowed VLANs only on the port-channel interface, not on its members.
Note that the IEEE standard method of interconnecting port-channels between vendors is LACP. Adtran doesn't seem to support this, although Cisco does. There is no guarantee of full connectivity between Cisco and Adtran using channel-group 1 mode on which doesn't use the IEEE standard and they may simply not interoperate. Ideally you would use channel-group 1 mode active on both sides for an LACP bundle. I don't think any version of AOS will accept this, perhaps the very latest will. If so, then use channel-group 1 mode active on both sides of the link.
In short, what you're attempting may not be supported due to proprietary differences between the port-channel signaling of Adtran and Cisco. Ideally, LACP should interoperate between vendors but it doesn't look like Adtran supports it (yet).
