Lab 19 Router On A Stick

Objective

To configure routing between vlans.

Topology

Basic Setting

• PC0 is connected to Fa0/1.
• PC1 is connected to Fa0/2.
• IPs have been configured.
• The router's G6/1 is connected to G1/1 on the switch.

Requirements

• Enable trunk on G1/1 on the switch.
• Create subinterfaces on G6/0 of the router.
• On G6/0.1, the IP is configured as 192.168.0.1 255.255.255.0, and this will be the gateway for VLAN1.
• The IP for G6/0.2 should be configured as 192.168.1.1 255.255.255.0, and this will be the gateway for VLAN2.

Steps

On Router1

Router>en
Router#confi t
Router(config)#interface gigabitEthernet 6/0
Router(config-if)#no sh
Router(config-if)#exit
Router(config)#interface gigabitEthernet 6/0.1   // go to subinterface
Router(config-subif)#encapsulation dot1Q 1  // set this subinterface as the gateway for VLAN1.
Router(config-subif)#ip address 192.168.0.1 255.255.255.0
Router(config-subif)#no sh
Router(config-subif)#exit
Router(config)#interface gigabitEthernet 6/0.2
Router(config-subif)#ip address 192.168.1.1 255.255.255.0
Router(config-subif)#encapsulation d
Router(config-subif)#encapsulation dot1Q 2 // set this as the gateway for VLAN2.
Router(config-subif)#no sh

Check IPs for sub-interfaces

Router#show int g6/0.1

GigabitEthernet6/0.1 is up, line protocol is up (connected)
  Hardware is PQUICC_FEC, address is 00d0.ba64.77ea (bia 00d0.ba64.77ea)
  Internet address is 192.168.0.1/24
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation 802.1Q Virtual LAN, Vlan ID 1
  ARP type: ARPA, ARP Timeout 04:00:00,
  Last clearing of "show interface" counters never

Router#show int g6/0.2

GigabitEthernet6/0.2 is up, line protocol is up (connected)
  Hardware is PQUICC_FEC, address is 00d0.ba64.77ea (bia 00d0.ba64.77ea)
  Internet address is 192.168.1.1/24
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation 802.1Q Virtual LAN, Vlan ID 2
  ARP type: ARPA, ARP Timeout 04:00:00,
  Last clearing of "show interface" counters never

On Switch0

Switch>en
Switch#confi t
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#int
Switch(config)#interface gigabitEthernet 1/1
Switch(config-if)#switchport mode trunk // set mode to Trunk

Ping PC0 from PC1

PC>ping 192.168.0.2
Pinging 192.168.0.2 with 32 bytes of data:
Reply from 192.168.0.2: bytes=32 time=17ms TTL=127
Reply from 192.168.0.2: bytes=32 time=17ms TTL=127
Reply from 192.168.0.2: bytes=32 time=15ms TTL=127
Reply from 192.168.0.2: bytes=32 time=16ms TTL=127
Ping statistics for 192.168.0.2:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 15ms, Maximum = 17ms, Average = 16ms
Summary: Subinterfaces,created on the G Ethernet interface which is connected to the trunk port on a switch, can be used for routing for different VLANS on a switch.