Objective: Configure R52 to route traffic between VLAN 13 and VLAN 23 using 802.1q encapsulation
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)#ip route 23.23.23.0 255.255.255.0 13.13.13.3
R2(config)#int e0/1
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(config)#int e0/2
R3(config-if)#no shu
R3(config-if)#int e0/2.13
R3(config-subif)#encapsulation dot1q 13
R3(config-subif)#ip add 13.13.13.3 255.255.255.0
R3(config-subif)#int e0/2.23
R3(config-subif)#encap dot 23
R3(config-subif)#ip add 23.23.23.3 255.255.255.0
SW1(config)#vlan 13
SW1(config-vlan)#exi
SW1(config)#vlan 23
SW1(config-vlan)#exi
SW1(config)#int e0/0
SW1(config-if)#switch access vlan 13
SW1(config-if)#no shu
SW1(config-if)#int e0/1
SW1(config-if)#switch acc vla 23
SW1(config-if)#no shu
SW1(config-if)#int e0/2
SW1(config-if)#switc trun encap dot
SW1(config-if)#swit mode trun
SW1(config-if)#no shu
Verify interface
R1#sh ip int bri | i Int|up
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 13.13.13.1 YES manual up up
R2(config-if)#do sh ip int bri | i Int|up
Interface IP-Address OK? Method Status Protocol
Ethernet0/1 23.23.23.2 YES manual up up
R3(config)#do sh ip int bri | i Int|up
Interface IP-Address OK? Method Status Protocol
Ethernet0/2 unassigned YES unset up up
Ethernet0/2.13 13.13.13.3 YES manual up up
Ethernet0/2.23 23.23.23.3 YES manual up up
SW1(config-if)#do sh ip int bri | i Int|up
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 unassigned YES unset up up
Ethernet0/1 unassigned YES unset up up
Ethernet0/2 unassigned YES unset up up
Verify the switchport and trunk in SW1
SW1(config-if)#do sh int e0/2 switch
Name: Et0/2
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
SW1(config-if)#do sh int trun
Port Mode Encapsulation Status Native vlan
Et0/2 on 802.1q trunking 1
Port Vlans allowed on trunk
Et0/2 1-4094
Port Vlans allowed and active in management domain
Et0/2 1,13,23
Port Vlans in spanning tree forwarding state and not pruned
Et0/2 1,13,23
Make sure ping is ok
R1#ping 23.23.23.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 23.23.23.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
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