FACULTY OF ENGINEERING. Lab Experiment

Transcription

1 FACULTY OF ENGINEERING ECE2056 Data Communications and Networking Lab Experiment DCN2: Network Setup and Study Using Switches Last revised: Revised by: GVT

2 Learning Outcome: Pre- Requisite: Instructions: Design a basic local area network through the connections of multiple switches. For the tasks given in this experiment, the students must have completed them in the simulator. Otherwise, it would be a waste of time running this experiment, and it may even damage the equipment used. For the following tasks, remember to capture the screenshots of your work, and put them in your report. 1. Topology a) Connect the switches (e.g., S3700 or S5700, etc.) according to the topology below. 2. Basic Operations a) Connect a PC to any of the switch (suggested to connect to LSW1) using a console cable. b) Run a terminal emulation program such as Putty on the PC to create a connection. c) Select a COM port (COM3 or COM4). The following settings should appear by default but if it does not, set the parameters to: 9600 bits per second 8 data bits No parity 1 stop bit No flow control d) Turn on the power switch to start the switches. When the startup process is complete, a command prompt is shown. You are now in User View environment. <Huawei> e) Before the switches can be configured, all prior configurations have to be reset or erased from the switch s memory. This is done to prevent configuration conflicts. 2

3 f) To reset the switch to the default factory configuration, run the reset saved-configuration command to clear all previous configurations. <Huawei> reset saved-configuration Warning: The action will delete the saved configuration in the device. The configuration will be erased to reconfigure. Continue? [Y/N]: y Warning: Now clearing the configuration in the device. Info: Succeeded in clearing the configuration in the device. <Huawei> g) Run the reboot command to restart the devices. <Huawei> reboot Info: The system is comparing the configuration, please wait. Warning: All the configuration will be saved to the next startup configuration. Continue? [y/n]: n System will reboot! Continue? [y/n]: y Info: system is rebooting, please wait h) Once the switch has rebooted, run the system-view command to access the System View. Most of the following tasks can only be completed in System View. <Huawei> system-view [Huawei] i) The first thing to do on a switch that had been recently erased is to change the device name using the sysname command. [Huawei] sysname LSW1 [LSW1] j) Repeat steps (a) till (i) for switch LSW2 as in the topology diagram. 3. Configure IP Address for an Interface a) We want to configure IP addresses for the switches. Although the switches have many physical interfaces (ports), a switch is a Layer 2 and hence, should not have an IP address. b) However, most managed switches (i.e. switches that can be configured) allow an IP address to be assigned to the switch through the use of a virtual interface. A virtual interface for a switch is called the Virtual LAN Interface or vlanif. The vlanif is virtual and therefore does not point to a specific physical interface. c) We begin with LSW1. At LSW1, VLANIF 1 is assigned the IP address /24. Run the following commands one after another: 3

4 [LSW1] interface vlanif 1 [LSW1-Vlanif1] ip address [LSW1-Vlanif1] quit [LSW1] d) Use the command display interface vlanif 1 to verify that the IP address has been successfully assigned. [LSW1] display interface vlanif 1 Vlanif1 current state : DOWN Description: Route Port, The Maximum Transmit Unit is 1500 Internet Address is /24 IP Sending Frames Format is PKTFMT_ETHNT_@, Hardware address is 4c1fcc18-3c73 Current system time: :12:39-08:00 Input bandwidth utilization : -- Output bandwidth utilization : -- e) Take a screenshot and attach it in your report. f) Repeat steps (c) till (e) for LSW2 but use the IP address of /24. Do not forget to take a screenshot and attach it in your report. g) In the output of display interface vlanif 1, carefully look for the MAC address of LSW1 and LSW2. Tip: MAC address is also known as address. Record this in your report too. LSW1: LSW2: 4. Test connectivity between the switches a) After completing the configuration, run the ping command to test the connection between any two switches. b) At LSW1, try to ping LSW2 at the IP address of [LSW1] ping PING : 56 data bytes, press CTRL_C to break Reply from : bytes=56 Sequence=1 ttl=255 time = 1 ms Reply from : bytes=56 Sequence=2 ttl=255 time = 2 ms Reply from : bytes=56 Sequence=3 ttl=255 time = 1 ms Reply from : bytes=56 Sequence=4 ttl=255 time = 3 ms Reply from : bytes=56 Sequence=5 ttl=255 time = 2 ms ping statistics packet(s) transmitted 5 packet(s) received 0.00% packet loss round-trip min/avg/max = 1/2/3 ms 4

5 c) Is there connectivity between LSW1 and LSW2? d) Likewise, attempt ping LSW1 from LSW2. Do you think that it will work? e) Be sure to take a screenshot of both the ping tests. f) If your connectivity tests fail, troubleshoot your configurations. 5. Check MAC Address Tables a) Run the ping command once again to ensure that the next command works properly. So, be sure to ping LSW1 ( ) from LSW2 ( ) and vice versa. b) Now, at each switch, run the following command: [LSW1] display mac-address [LSW2] display mac-address c) The command display mac-address is used to check the MAC address table (i.e. MAC addresses that have been recorded) d) Be sure to take a screenshot of your results. e) Report and explain the results that you observe. Tip: Explain your results here in relation to the results that you obtained in Section 3, Part (g). 6. Spanning Tree Protocol (STP) a) Now let us investigate the importance of Spanning Tree Protocol (STP). b) At each switch, turn off the STP by running the command stp disable. [LSW1] stp disable [LSW2] stp disable c) Check the MAC address table multiple times at each switch. Observe very carefully for any changes. d) Take a screenshot once you have identified the changes. Report your observation. Can you name the problem and explain the cause? 5

6 e) At each switch, enable STP again by running the command stp enable. [LSW1] stp enable [LSW2] stp enable f) Do the changes in the MAC address table recur? Explain the purpose and operations of STP. g) You can view the operations of STP using the command display stp brief [LSW1] display stp brief [LSW2] display stp brief h) Take a screenshot on both switches and explain the STP states. Tip: Use Google. 7. Prepare the report a) Compose a report that consists of the observations of the results of each command/task. Briefly discuss your observations using the questions in the lab sheet as a guide. b) Use the template in the following page as the cover page of your report. 6

7 FACULTY OF ENGINEERING ECE2056 Data Communications and Networking Lab Experiment DCN2: Network Setup and Study Using Switches Student Name: Student ID: Lab Group No.: Degree Major: Declaration of originality: I declare that all sentences, results and data mentioned in this report are from my own work. All work derived from other authors have been listed in the references. I understand that failure to do this is considered plagiarism. I agree that this report will be given 0 marks if any words/photos in this report are copied from others. Student s signature: 7