Configuring 802.1Q Trunk-Based Inter-VLAN Routing Topology

Lab – Configuring 802.1Q Trunk-Based Inter-VLAN Routing
Topology

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Lab – Configuring 802.1Q Trunk-Based Inter-VLAN Routing

Addressing Table
Device
R1

Interface

IP Address

Subnet Mask

Default Gateway

G0/1.1

192.168.1.1

255.255.255.0

N/A

G0/1.10

192.168.10.1

255.255.255.0

N/A

G0/1.20

192.168.20.1

255.255.255.0

N/A

Lo0

209.165.200.225

255.255.255.224

N/A

S1

VLAN 1

192.168.1.11

255.255.255.0

192.168.1.1

S2

VLAN 1

192.168.1.12

255.255.255.0

192.168.1.1

PC-A

NIC

192.168.10.3

255.255.255.0

192.168.10.1

PC-B

NIC

192.168.20.3

255.255.255.0

192.168.20.1

Switch Port Assignment Specifications
Ports

Assignment

Network

S1 F0/1

802.1Q Trunk

N/A

S2 F0/1

802.1Q Trunk

N/A

S1 F0/5

802.1Q Trunk

N/A

S1 F0/6

VLAN 10 – Students

192.168.10.0/24

S2 F0/18

VLAN 20 – Faculty

192.168.20.0/24

Objectives
Part 1: Build the Network and Configure Basic Device Settings
Part 2: Configure Switches with VLANs and Trunking
Part 3: Configure Trunk-Based Inter-VLAN Routing

Background / Scenario
A second method of providing routing and connectivity for multiple VLANs is through the use of an 802.1Q
trunk between one or more switches and a single router interface. This method is also known as router-on-astick inter-VLAN routing. In this method, the physical router interface is divided into multiple subinterfaces that
provide logical pathways to all VLANs connected.
In this lab, you will configure trunk-based inter-VLAN routing and verify connectivity to hosts on different
VLANs as well as with a loopback on the router.
Note: This lab provides minimal assistance with the actual commands necessary to configure trunk-based
inter-VLAN routing. However, the required configuration commands are provided in Appendix A of this lab.
Test your knowledge by trying to configure the devices without referring to the appendix.
Note: The routers used with CCNA hands-on labs are Cisco 1941 Integrated Services Routers (ISRs) with
Cisco IOS, Release 15.2(4)M3 (universalk9 image). The switches used are Cisco Catalyst 2960s with Cisco
IOS, Release 15.0(2) (lanbasek9 image). Other routers, switches and Cisco IOS versions can be used.
Depending on the model and Cisco IOS version, the commands available and output produced might vary

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Lab – Configuring 802.1Q Trunk-Based Inter-VLAN Routing
from what is shown in the labs. Refer to the Router Interface Summary Table at the end of the lab for the
correct interface identifiers.
Note: Make sure that the routers and switches have been erased and have no startup configurations. If you
are unsure, contact your instructor.

Required Resources

1 Router (Cisco 1941 with Cisco IOS, release 15.2(4)M3 universal image or comparable)

2 Switches (Cisco 2960 with Cisco IOS, release 15.0(2) lanbasek9 image or comparable)

2 PCs (Windows 7, Vista, or XP with terminal emulation program, such as Tera Term)

Console cables to configure the Cisco IOS devices via the console ports

Ethernet cables as shown in the topology

Part 1: Build the Network and Configure Basic Device Settings
In Part 1, you will set up the network topology and configure basic settings on the PC hosts, switches, and
router.

Step 1: Cable the network as shown in the topology.
Step 2: Configure PC hosts.
Step 3: Initialize and reload the router and switches as necessary.
Step 4: Configure basic settings for each switch.
a. Disable DNS lookup.
b. Configure device names as shown in the topology.
c.

Assign class as the privileged EXEC password.

d. Assign cisco as the console and vty passwords.
e. Configure logging synchronous for the console line.
f.

Configure the IP address listed in the Addressing Table for VLAN 1 on both switches.

g. Configure the default gateway on both switches.
h. Administratively deactivate all unused ports on the switch.
i.

Copy the running configuration to the startup configuration.

Step 5: Configure basic settings for the router.
a. Disable DNS lookup.
b. Configure device names as shown in the topology.
c.

Configure the Lo0 IP address as shown in the Address Table. Do not configure subinterfaces at this time
as they will be configured in Part 3.

d. Assign cisco as the console and vty passwords.
e. Assign class as the privileged EXEC password.
f.

Configure logging synchronous to prevent console messages from interrupting command entry.

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Lab – Configuring 802.1Q Trunk-Based Inter-VLAN Routing
g. Copy the running configuration to the startup configuration.

Part 2: Configure Switches with VLANs and Trunking
In Part 2, you will configure the switches with VLANs and trunking.
Note: The required commands for Part 2 are provided in Appendix A. Test your knowledge by trying to
configure S1 and S2 without referring to the appendix.

Step 1: Configure VLANs on S1.
a. On S1, configure the VLANs and names listed in the Switch Port Assignment Specifications table. Write
the commands you used in the space provided.

S1:vlan 10
S1:name Students
S1:interface vlan 10
S1:ip address 192.168.10.0 255.255.0.0

b. On S1, configure the interface connected to R1 as a trunk. Also configure the interface connected to S2
as a trunk. Write the commands you used in the space provided.

S1:interface f0/1
S1:switchport mode trunk
S1:interface f0/5
S1:switchport mode trunk

c.

On S1, assign the access port for PC-A to VLAN 10. Write the commands you used in the space
provided.
S1:interface f0/6
S1:switchport access vlan 10

Step 2: Configure VLANs on Switch 2.
a. On S2, configure the VLANs and names listed in the Switch Port Assignment Specifications table.
b. On S2, verify that the VLAN names and numbers match those on S1. Write the command you used in the
space provided.

show vlan brief
c.

On S2, assign the access port for PC-B to VLAN 20.

d. On S2, configure the interface connected to S1 as a trunk.

Part 3: Configure Trunk-Based Inter-VLAN Routing
In Part 3, you will configure R1 to route to multiple VLANs by creating subinterfaces for each VLAN. This
method of inter-VLAN routing is called router-on-a-stick.
Note: The required commands for Part 3 are provided in Appendix A. Test your knowledge by trying to
configure trunk-based or router-on-a-stick inter-VLAN routing without referring to the appendix.

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Lab – Configuring 802.1Q Trunk-Based Inter-VLAN Routing

Step 1: Configure a subinterface for VLAN 1.
a. Create a subinterface on R1 G0/1 for VLAN 1 using 1 as the subinterface ID. Write the command you
used in the space provided.
interface g0/1.1
b. Configure the subinterface to operate on VLAN 1. Write the command you used in the space provided.
encapsulation dot1Q 1
c.

Configure the subinterface with the IP address from the Address Table. Write the command you used in
the space provided.
ip address 192.168.1.1 255.255.255.0

Step 2: Configure a subinterface for VLAN 10.
a. Create a subinterface on R1 G0/1 for VLAN 10 using 10 as the subinterface ID.
b. Configure the subinterface to operate on VLAN 10.
c.

Configure the subinterface with the address from the Address Table.

Step 3: Configure a subinterface for VLAN 20.
a. Create a subinterface on R1 G0/1 for VLAN 20 using 20 as the subinterface ID.
b. Configure the subinterface to operate on VLAN 20.
c.

Configure the subinterface with the address from the Address Table.

Step 4: Enable the G0/1 interface.
Enable the G0/1 interface. Write the commands you used in the space provided.

interface g0/1
no shutdown

Step 5: Verify connectivity.
Enter the command to view the routing table on R1. What networks are listed?
show ip route
From PC-A, is it possible to ping the default gateway for VLAN 10? No
From PC-A, is it possible to ping PC-B? No
From PC-A, is it possible to ping Lo0 Yes
From PC-A, is it possible to ping S2? No
If the answer is no to any of these questions, troubleshoot the configurations and correct any errors.

Reflection
What are the advantages of trunk-based or router-on-a-stick inter-VLAN routing?

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Lab – Configuring 802.1Q Trunk-Based Inter-VLAN Routing

Router Interface Summary Table
Router Interface Summary
Router Model

Ethernet Interface #1

Ethernet Interface #2

Serial Interface #1

Serial Interface #2

1800

Fast Ethernet 0/0
(F0/0)

Fast Ethernet 0/1
(F0/1)

Serial 0/0/0 (S0/0/0)

Serial 0/0/1 (S0/0/1)

1900

Gigabit Ethernet 0/0
(G0/0)

Gigabit Ethernet 0/1
(G0/1)

Serial 0/0/0 (S0/0/0)

Serial 0/0/1 (S0/0/1)

2801

Fast Ethernet 0/0
(F0/0)

Fast Ethernet 0/1
(F0/1)

Serial 0/1/0 (S0/1/0)

Serial 0/1/1 (S0/1/1)

2811

Fast Ethernet 0/0
(F0/0)

Fast Ethernet 0/1
(F0/1)

Serial 0/0/0 (S0/0/0)

Serial 0/0/1 (S0/0/1)

2900

Gigabit Ethernet 0/0
(G0/0)

Gigabit Ethernet 0/1
(G0/1)

Serial 0/0/0 (S0/0/0)

Serial 0/0/1 (S0/0/1)

Note: To find out how the router is configured, look at the interfaces to identify the type of router and how many
interfaces the router has. There is no way to effectively list all the combinations of configurations for each router
class. This table includes identifiers for the possible combinations of Ethernet and Serial interfaces in the device.
The table does not include any other type of interface, even though a specific router may contain one. An
example of this might be an ISDN BRI interface. The string in parenthesis is the legal abbreviation that can be
used in Cisco IOS commands to represent the interface.

Appendix A – Configuration Commands
Switch S1
S1(config)# vlan 10
S1(config-vlan)# name Students
S1(config-vlan)# vlan 20
S1(config-vlan)# name Faculty
S1(config-vlan)# exit
S1(config)# interface f0/1
S1(config-if)# switchport mode trunk
S1(config-if)# interface f0/5
S1(config-if)# switchport mode trunk
S1(config-if)# interface f0/6
S1(config-if)# switchport mode access
S1(config-if)# switchport access vlan 10

Switch S2
S2(config)# vlan 10
S2(config-vlan)# name Students
S2(config-vlan)# vlan 20
S2(config-vlan)# name Faculty
S2(config)# interface f0/1
S2(config-if)# switchport mode trunk

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Lab – Configuring 802.1Q Trunk-Based Inter-VLAN Routing
S2(config-if)# interface f0/18
S2(config-if)# switchport mode access
S2(config-if)# switchport access vlan 20

Router R1
R1(config)# interface g0/1.1
R1(config-subif)# encapsulation dot1Q 1
R1(config-subif)# ip address 192.168.1.1 255.255.255.0
R1(config-subif)# interface g0/1.10
R1(config-subif)# encapsulation dot1Q 10
R1(config-subif)# ip address 192.168.10.1 255.255.255.0
R1(config-subif)# interface g0/1.20
R1(config-subif)# encapsulation dot1Q 20
R1(config-subif)# ip address 192.168.20.1 255.255.255.0
R1(config-subif)# exit
R1(config)# interface g0/1
R1(config-if)# no shutdown

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