LAB: 802.1q Layer 2 tunneling

R1:
interface FastEthernet0/0
no shutdown
!
interface FastEthernet0/0.14
encapsulation dot1Q 14
ip address 14.0.0.1 255.255.255.0
!
interface FastEthernet0/0.41
encapsulation dot1Q 41
ip address 41.0.0.1 255.255.255.0
R4:
interface FastEthernet0/1
no shutdown
!
interface FastEthernet0/1.14
encapsulation dot1Q 14
ip address 14.0.0.4 255.255.255.0
!
interface FastEthernet0/1.41
encapsulation dot1Q 41
ip address 41.0.0.4 255.255.255.0

SW1:
system mtu 1504
!
interface FastEthernet0/1
switchport access vlan 100
switchport mode dot1q-tunnel
l2protocol-tunnel cdp
no cdp enable
!
interface FastEthernet0/13
switchport trunk encapsulation dot1q
switchport mode trunk
SW2:
system mtu 1504
!
interface FastEthernet0/13
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface FastEthernet0/16
switchport trunk encapsulation dot1q
switchport mode trunk

SW3:
system mtu 1504
!
interface FastEthernet0/16
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface FastEthernet0/19
switchport trunk encapsulation dot1q
switchport mode trunk
SW4:
system mtu 1504
!
interface FastEthernet0/4
switchport access vlan 100
switchport mode dot1q-tunnel
l2protocol-tunnel cdp
no cdp enable
!
interface FastEthernet0/19
switchport trunk encapsulation dot1q
switchport mode trunk

verification:

Rack1R4#show cdp neighbor
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater
Device ID Local Intrfce Holdtme Capability Platform Port ID
Rack1R1 Fas 0/1 125 R S I 2610XM Fas 0/0