All,

I have been on this lab for too log now trying to figure out why my
Q&Q/L2TP tunnel is not working for Task 5.6. Here are my configs for
SW2/SW4.

===============================================
Cat2
-------

interface FastEthernet0/19
 switchport access vlan 990
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 1-11,13-989,991-998,1000-4094
 switchport mode dot1q-tunnel
 l2protocol-tunnel cdp
 l2protocol-tunnel stp
 l2protocol-tunnel vtp
 no cdp enable
!
interface FastEthernet0/20
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 1-11,13-989,991-998,1000-4094
 switchport mode trunk
!
interface FastEthernet0/21
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 567
 switchport trunk allowed vlan 100,200,300,567
 switchport mode trunk
!
interface FastEthernet0/22
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 990
 switchport mode trunk
!
interface FastEthernet0/23
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 567
 switchport trunk allowed vlan none
 switchport mode trunk
!
interface FastEthernet0/24
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 1-11,13-989,991-998,1000-4094
 switchport mode trunk

=============================================================================
Cat4
-------
interface GigabitEthernet1/0/19
 switchport access vlan 990
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 1-11,13-989,991-998,1000-4094
 switchport mode dot1q-tunnel
 l2protocol-tunnel cdp
 l2protocol-tunnel stp
 l2protocol-tunnel vtp
 no cdp enable
!
interface GigabitEthernet1/0/20
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 1-11,13-989,991-998,1000-4094
 switchport mode trunk
!
interface GigabitEthernet1/0/21
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 567
 switchport trunk allowed vlan 100,200,300,567
 switchport mode trunk
!
interface GigabitEthernet1/0/22
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 990
 switchport mode trunk
!
interface GigabitEthernet1/0/23
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 1-11,13-89,991-998,1000-4094
 switchport mode trunk
!
interface GigabitEthernet1/0/24
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 1-11,13-665,667-989,991-998,1000-4094
 switchport mode trunk
=====================================================================

I have already tried doing this a couple of times, but it still does not
work. I get the error:

00:10:58: %PM-4-ERR_DISABLE: l2ptguard error detected on Gi1/0/19, putting
Gi1/0/19 in err-disable state
Cat4#sh int stat
00:11:00: %LINEPROTO-5-UPDOWN: Line protocol on Interface
GigabitEthernet1/0/19, changed state to down
Cat4#sh int stat
00:11:01: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/19, changed state to
down
Cat4#sh int status
I am sure you have ran into this issue.

Thanks for your help.

Khalifa
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