Hmm. Handige scratchpad voor het trunken van twee Cisco switches:

interface FastEthernet0/1
port group 1

!— Assigned port to port channel 1.
switchport trunk encapsulation dot1q
!— Configured the port to use the trunking encapsulation dot1Q.
switchport mode trunk
!— Configured port to be in trunking mode.
!
interface FastEthernet0/2
port group 1
!— Assigned port to port channel 1.
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface FastEthernet0/3
port group 1
!— Assigned port to port channel 1.
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface FastEthernet0/4
port group 1
!— Assigned port to port channel 1.
switchport trunk encapsulation dot1q
switchport mode trunk

Denk om het saven van running config -> startup config en een lekkere, versie, nieuwe firmware!
Succes!