Topology
Addressing Table
|
Device
|
Interface
|
IP Address
|
Subnet Mask
|
Default Gateway
|
|
R1
|
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-a-stick 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 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.
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.
____________________________________________________________________________________
____________________________________________________________________________________
____________________________________________________________________________________
____________________________________________________________________________________
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.
____________________________________________________________________________________
____________________________________________________________________________________
c.
On S1, assign the access port
for PC-A to VLAN 10. Write the commands you used in the space provided.
____________________________________________________________________________________
____________________________________________________________________________________
____________________________________________________________________________________
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.
____________________________________________________________________________________
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.
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.
____________________________________________________________________________________
b.
Configure the subinterface to
operate on VLAN 1. Write the command you used in the space provided.
____________________________________________________________________________________
c.
Configure the subinterface with
the IP address from the Address Table. Write the command you used in the space
provided.
____________________________________________________________________________________
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.
_______________________________________________________________________________________
Step 5:
Verify connectivity.
Enter the command to view the routing
table on R1. What networks are listed?
_______________________________________________________________________________________
From PC-A, is it possible to ping the
default gateway for VLAN 10? _____
From PC-A, is it possible to ping PC-B?
_____
From PC-A, is it possible to ping Lo0?
_____
From PC-A, is it possible to ping S2?
_____
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?
_______________________________________________________________________________________
_______________________________________________________________________________________
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
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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