802.1Q Tunneling Problem

[wngzhiyu007]

Switch 1&Switch 2

vlan 100
interface gi0/0
switch trunk encap dot
switch mode trunk

interface GigabitEthernet0/1
switchport access vlan 100
switchport mode dot1q-tunnel
media-type rj45
negotiation auto
l2protocol-tunnel cdp
l2protocol-tunnel stp
l2protocol-tunnel vtp
no cdp enable

switch 3&switch 5

vlan 14

interface GigabitEthernet0/0
switchport trunk encapsulation dot1q
switchport mode trunk

interface gi0/1
switchport access vlan 14
switchport mode access
vIOS7/vIOS9

interface GigabitEthernet0/0
ip address 10.0.0.1/2 255.255.255.0
duplex auto
speed auto
media-type rj45

When I did ping from 10.0.0.2 to 10.0.0.1, G0/1 in Switch 1 does not strip the outer tag 100 and when I did ping from 10.0.0.1 to 10.0.0.2, Gi0/1 in Switch 2 does not strip the outer tag 100.

here is the arp packet for ping from 10.0.0.2 to 10.0.0.1 at G0/0 Switch 3

Please help to find the reason!

[Georg Pauwen]

Hello,

what switch model (e.g. 3850) is this on, and what IOS version are you running ?

[wngzhiyu007]

vios_l2 Software (vios_l2-ADVENTERPRISEK9-M), Version 15.2(4.0.55)E

[wngzhiyu007]

it looks like QinQ works fine when adding outer vlan, but does not work when striping outer vlan.

[Giuseppe Larosa]

Hello,

your configuration looks like correct.

However, you are using some kind of virtual switch.

It can be a limitation of this platform.

On real switches your configuration will work.

Hope to help

Giuseppe

[wngzhiyu007]

Hi Giuseppe, thanks so much!