Lab 7. Switching - Router on a Stick and the Native VLAN

Objective: Configure R1 to route traffic between VLAN 13 and VLAN 23. VLAN 13 should be the 802.1q Native VLAN

R1:

R1(config)#int e0/0

R1(config-if)#ip add 13.13.13.1 255.255.255.0

R1(config-if)#no shu

R1(config-if)#ip route 23.23.23.0 255.255.255.0 13.13.13.3

R2:

R2(config)#int e0/2

R2(config-if)#ip add 23.23.23.2 255.255.255.0

R2(config-if)#no shu

R2(config-if)#ip route 13.13.13.0 255.255.255.0 23.23.23.3

R3: 

R3(config)#int e0/3

R3(config-if)#no shu

R3(config-if)#int e0/3.13

R3(config-subif)#encap dot1q 13 native

R3(config-subif)#ip add 13.13.13.3 255.255.255.0

R3(config-subif)#int e0/3.23

R3(config-subif)#encap dot1q 23      

R3(config-subif)#ip add 23.23.23.3 255.255.255.0

SW1:

SW1(config)#vlan 13,23

SW1(config-vlan)#exi

SW1(config)#int e0/0                               ---> to R1

SW1(config-if)#switch acce vla 13

SW1(config-if)#no shu

SW1(config-if)#int e0/1                           ---> to SW2

SW1(config-if)#switch trunk encap dot

SW1(config-if)#switch mod trun

SW1(config-if)#no shu

SW2:

SW2(config)#vla 13,23

SW2(config-vlan)#exi

SW2(config)#int e0/2                             ---> to R2

SW2(config-if)#switch acc vla 23

SW2(config-if)#no shu

SW2(config-if)#int e0/3                          ---> to R3

SW2(config-if)#switch trunk encap dot

SW2(config-if)#switch trunk native vla 13

SW2(config-if)#switch mode trunk

SW2(config-if)#no shu

SW2(config-if)#int e0/1                         ---> to SW1

SW2(config-if)#switc

SW2(config-if)#switc trunk encap dot1

SW2(config-if)#switc mode trunk

SW2(config-if)#no shu

Verify the switchport and trunk

SW1(config-if)#do sh int trunk 

Port                Mode         Encapsulation  Status        Native vlan

Et0/1               on              802.1q            trunking      1

Port                Vlans allowed on trunk

Et0/1               1-4094

Port                Vlans allowed and active in management domain

Et0/1               1,13,23

Port                Vlans in spanning tree forwarding state and not pruned

Et0/1               1,13,23

SW1(config-if)#do sh int e0/1 switch

Name: Et0/1

Switchport: Enabled

Administrative Mode: trunk

Operational Mode: trunk

Administrative Trunking Encapsulation: dot1q

Operational Trunking Encapsulation: dot1q

Operational Dot1q Ethertype:  0x8100

Negotiation of Trunking: On

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 1 (default)

Administrative Native VLAN tagging: enabled

Operational Native VLAN tagging: disabled

  

SW2(config-if)#do sh int trunk

Port                Mode         Encapsulation  Status        Native vlan

Et0/1               on              802.1q            trunking      1

Et0/3               on              802.1q            trunking      13

Port                Vlans allowed on trunk

Et0/1               1-4094

Et0/3               1-4094

Port                Vlans allowed and active in management domain

Et0/1               1,13,23

Et0/3               1,13,23

Port                Vlans in spanning tree forwarding state and not pruned

Et0/1               1,13,23

Et0/3               1,13,23

SW2(config-if)#do sh int e0/3 switch

Name: Et0/3

Switchport: Enabled

Administrative Mode: trunk

Operational Mode: trunk

Administrative Trunking Encapsulation: dot1q

Operational Trunking Encapsulation: dot1q

Operational Dot1q Ethertype:  0x8100

Negotiation of Trunking: On

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 13 (VLAN0013)

Administrative Native VLAN tagging: enabled

Operational Native VLAN tagging: disabled

SW2(config-if)#do sh int e0/2 switch

Name: Et0/2

Switchport: Enabled

Administrative Mode: dynamic desirable

Operational Mode: static access

Administrative Trunking Encapsulation: negotiate

Operational Trunking Encapsulation: native

Operational Dot1q Ethertype:  0x8100

Negotiation of Trunking: On

Access Mode VLAN: 23 (VLAN0023)

Trunking Native Mode VLAN: 1 (default)

Administrative Native VLAN tagging: enabled

Operational Native VLAN tagging: disabled 

SW2(config-if)#do sh int e0/1 switch

Name: Et0/1

Switchport: Enabled

Administrative Mode: trunk

Operational Mode: trunk

Administrative Trunking Encapsulation: dot1q

Operational Trunking Encapsulation: dot1q

Operational Dot1q Ethertype:  0x8100

Negotiation of Trunking: On

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 1 (default)

Administrative Native VLAN tagging: enabled

Operational Native VLAN tagging: disabled

Make sure ping is ok

R2#sh ip rou 13.13.13.1

Routing entry for 13.13.13.0/24

  Known via "static", distance 1, metric 0

  Routing Descriptor Blocks:

  * 23.23.23.3

      Route metric is 0, traffic share count is 1

R2#ping 13.13.13.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 13.13.13.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/4/8 ms