1.17 EtherChannel over 802.1q Tunneling

Hello in version workbook "iewb-rs-vol1.ENTIREWORKBOOK.v5.019"

section 1.17 solution configuration include:




interface FastEthernet 0/19

switchport access vlan 100

swichtport trunk encapsulation dot1q


Do there be indispensable ?

Configuration of encapsulation trunk is only in fas 0/19

Best regards



  • As long as the ports are using dot1q, then dot1q-tunnel should work.
    So, just make sure the encapsulation is set to dot1q on each dot1q-tunnel port.

  • Hi,

       Command "switchport trunk encapsulation dot1q" says ue DTP to negotiate ttrunk but use only dot1q, NOT ISL. However, command "switchport mode dot1q-tunnel" disables DTP and makes the port a dot1q-tunnel port. So the first command is useless and it is not needed to make the feature functional.

    Good luck with your studies!

  • Thanks for the correction Christian.
    Indeed, the port is not actually running trunking, hence the command is useless.

    Rack1SW2#sh run int g0/13
    Building configuration...

    Current configuration : 195 bytes
    interface GigabitEthernet0/13
     switchport access vlan 100
     switchport mode dot1q-tunnel
     l2protocol-tunnel cdp
     l2protocol-tunnel stp
     l2protocol-tunnel point-to-point pagp
     no cdp enable

    Rack1SW2#sh int g0/13 switch
    Name: Gi0/13
    Switchport: Enabled
    Administrative Mode: tunnel
    Operational Mode: tunnel
    Administrative Trunking Encapsulation: negotiate
    Operational Trunking Encapsulation: native
    Negotiation of Trunking: Off
    Access Mode VLAN: 100 (VLAN0100)
    Trunking Native Mode VLAN: 1 (default)
    Administrative Native VLAN tagging: enabled
    Voice VLAN: none
    Administrative private-vlan host-association: none
    Administrative private-vlan mapping: none
    Administrative private-vlan trunk native VLAN: none
    Administrative private-vlan trunk Native VLAN tagging: enabled
    Administrative private-vlan trunk encapsulation: dot1q
    Administrative private-vlan trunk normal VLANs: none
    Administrative private-vlan trunk associations: none
    Administrative private-vlan trunk mappings: none
    Operational private-vlan: none
    Trunking VLANs Enabled: ALL
    Pruning VLANs Enabled: 2-1001
    Capture Mode Disabled
    Capture VLANs Allowed: ALL

    Protected: false
    Unknown unicast blocked: disabled
    Unknown multicast blocked: disabled
    Appliance trust: none

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