S3524_config#sho run
Building configuration...


Current configuration:
!
!version 2.0.1l
service timestamps log date
service timestamps debug date
!
hostname S3524
!
!
!
!
spanning-tree mode rstp
!
!
policy-map      1         //policy map to define cos,for only 1 cos.for more.need to define more.
 classify icos 1          //inner vlan cos=1
 action cos 1             //add 2nd tag cos=1
!
!
aaa authentication login default none
aaa authentication enable default none
!
!
!
interface GigaEthernet0/1               //QinQ uplink port 
 switchport mode dot1q-tunnel-uplink
 switchport trunk vlan-untagged none
!
interface GigaEthernet0/2
!
interface GigaEthernet0/3
!
interface GigaEthernet0/4
!         
interface GigaEthernet0/5
!
interface GigaEthernet0/6
!
interface GigaEthernet0/7
!
interface GigaEthernet0/8
!
interface GigaEthernet0/9
!
interface GigaEthernet0/10
!
interface GigaEthernet0/11
!
interface GigaEthernet0/12
!
interface GigaEthernet0/13
!
interface GigaEthernet0/14
!
interface GigaEthernet0/15
!
interface GigaEthernet0/16
!
interface GigaEthernet0/17
!
interface GigaEthernet0/18
!
interface GigaEthernet0/19
!
interface GigaEthernet0/20
!
interface GigaEthernet0/21
!
interface GigaEthernet0/22
!
interface GigaEthernet0/23
!
interface GigaEthernet0/24           //QinQ downlink port
 switchport mode dot1q-translating-tunnel
 switchport dot1q-translating-tunnel translate 1-4 5 6   //inner vlan=1 to 4, then give 2nd tag 5, and default cos=6
 qos policy 1 ingress                //apply qos policy "1" to this port, when packet icos=1, add 2nd tag cos=1
!
interface VLAN1
 ip address 192.168.35.24 255.255.0.0
 no ip directed-broadcast
!
dot1q-tunnel

vlan 1-5
!
!