Router:

interface Ethernet0/0
 no ip address
 ip nat inside
 full-duplex
!
interface Ethernet0/0.1
 encapsulation dot1Q 1 native
 ip address 192.168.1.254 255.255.255.0

Switch:

!
interface FastEthernet0/1
 description Connection to Router (Trunk)
 switchport mode trunk
 switchport voice vlan 2
 duplex full
 spanning-tree portfast
!

!
interface Vlan1
 ip address 192.168.1.253 255.255.255.0
 no ip route-cache

!
end




Switch#sh int Fast0/1 switch
Name: Fa0/1
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: 2 (VLAN_Voice)
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: 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