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interface GigabitEthernet1/1
switchport trunk allowed vlan 10,20
switchport trunk encapsulation dot1q
switchport mode trunk
negotiation auto
channel-group 1 mode active
!
interface GigabitEthernet1/2
switchport trunk allowed vlan 10,20
switchport trunk encapsulation dot1q
switchport mode trunk
negotiation auto
channel-group 1 mode active
interface Port-channel1
switchport trunk allowed vlan 10,20
switchport trunk encapsulation dot1q
switchport mode trunk
On both sides.