Purpose:

In this lab, we'll learn how to configure a Cisco Catalyst router to do layer-2 vlan switching between multiple Ethernet interfaces.

Procedure:

You will work together in groups of 3.

0. Boot your 3 machines into Linux. Note *carefully* which ethernet interfaces on the machines are up and running. (!!!) After you note this for yourself, unplug 2 of the machines from all networks.

1. Get a Cisco Catalyst router and light blue serial cable from your benevolent professor. Connect the router to a USB port on the one machine still connected to the green network. Do not plug the router in yet.

2. Download and install putty on the same machine. (Use apt-get. If you don't remember how to do this, look back at a previous lab to see how.)

*** Q1: What is the command to get putty onto your computer? ***

3. Configure putty to be able to communicate with the router over the USB port (/dev/ttyUSB0).

• run sudo putty
• Click on Serial for the Connection Type:
• Set the serial line to /dev/ttyUSB0
• Click on Keyboard, then set backspace key to Control-H.
• Click on Session. Click on Default Settings. Click Save.
• Click Open.

Notes for me:

cisco / cisco

• show system mode shows switch or router. Can be set with set system mode
• show spanning-tree shows the status of STP.
• have to use Ctrl-H to do backspace.
• show interfaces status to see interfaces.
• show mac address-table to see layer 2 forwarding table.
  • Note that the machines are on vlan 1.
• Need to disable network-manager on the linux boxes or setting ip addr manually will not stick.
• How do you end a PUtty session cleanly? I just killed the window but it was still connected to the /dev/tty, so now I cannot start putty again...

4. Now, plug the router in. Wait a while. You will see the router boot (slowly). You'll see the file system being tested, the OS loading, and the hardware components being tested. Eventually, it will ask you these questions. (Your answer are in bold below.)

Would you like to enter the initial configuration dialog? [yes/no] yes

Would you like to enter basic management setup? [yes/no] yes

Enter host name [Switch]: <any hostname here is fine. I used is333-1.>

Enter enable secret: bluestone

Enter enable password: hi

Enter virtual terminal password: bluestone

Configure SNMP Network Mangement? [no] no

<Press space when you see --More--.>

Enter interface name used to connect to the
management network from the above interface summary: vlan1
(Note that vlan1 is in the list, but scrolled off the top.)

Configure IP on this interface [yes]: yes

IP address for this interface: 10.0.0.1

Subnet mask for this interface [255.0.0.0]: <enter>

Would you like to enable as a cluster command switch? [yes/no]: no

<Menu about saving your configuration>
Enter your selection [2] : 2

<Enter>

is333-1> (You will see your switch name here, if you didn't use is333-1 like I did.)

At this point, we have configured the basic passwords on the router, and created a VLAN (vlan1) with an IP address, for use in managing the router. We are now in "non-enabled" mode, which means we can see some basic stuff, but cannot make changes.

*** Q2: Use show version to see the version of software running on the router. Record it in your lab report. ***

5. Creating a (2nd) vlan for switching traffic

vlan1 was created for managing the router. Now, we need to create a second vlan for use in switching traffic between hosts.

All commands for changing the configuration of the router require you to be in "enable" mode. To enter this mode, type

is333-1> enable
Password: bluestone

is333-1#

Type ? to see the options for commands. You can use ? within a command also to see available parameters to a command.

NOTE: most of the following does not work.

• seems like to set a vlan name you do config t, then interface vlan 10, then name... But why are you setting the name of a vlan in the interface menu?

To add interfaces to a vlan we have to create the vlan first:

• is333-1# conf t (set the router to receive configuration commands from the terminal)
• is333-1(config)# vlan ?
<You see about 3 ways to complete the vlan command. The first one creates a vlan.>
• is333-1(config)# vlan database (we are creating a vlan with number 10)
• is333-1(config-vlan)# name <put a name here. I chose red.>
• end (to get out of configuring the vlan mode)
• show vlan
*** Q3: Record the line(s) you see regarding the vlan you just created. ***
  

6. Add interfaces to the vlan

• Get into "configuration terminal" mode again.
• Use ? to find out how to get into the mode where you are configuring the "vlan 10 interface".
  *** Q4: What command did you use to get into this mode? ***
• Ethernet interfaces are "FastEthernet" on these devices, and ports are labeled 0/n. This is because we can stack multiple switches together, in which case the first switch is 0, second is 1, etc., and the n is the port # on that switch. Note: don't ever type the whole word "FastEthernet". Just type fa<tab>.
• To add interfaces to a vlan we have to get into the interface config mode:
• is333-1(config-if)# interface fastEthernet 0/1
• is333-1(config-if)# switchport access vlan 10 (this makes FastEthernet port 0/1 a part of vlan 10 switching.)
• is333-1(config-if)# end (commit the changes)
• is333-1# show vlan
• *** Q5: What does this command show now? ***
• Repeat the above commands, adding a second port to vlan 10.

Now, using ethernet cables connect your other 2 machines to the ports that you added to vlan 10. Then, create IP addresses on those interfaces (e.g., 15.0.0.1/24 and 15.0.0.2/24), and see if you can ping between the hosts. (You might find it very useful to refer here to see how to turn off the NetworkManager and how to set IP addresses.)

HERE, perhaps, repeat with web interface.

• Note that the cisco switch comes up with an IP adress of 192.168.1.254/24 by default: show ip interface.
• My problem is how to connect to it from a linux box so I can use a web browser...
• ip dhcp server does not work with error: DHCP server cannot be configured. To enable the DHCP server, remove DHCP clients on all interfaces.

7. Extra credit.

Set up two other hosts to use the same switch, but be on a different VLAN.

*** Q6: List the steps to do that. ***

8. Another Extra Credit

Now, set up the switch to do routing between the two VLANs.

*** Q7: List the steps to do it. ***

9. Clean up and submit your answers via moodle.