Rootbridge ITT-270 STP, Root Bridge, PortFast, BPDU Guard, and EtherChannel Guide Directions: This assignment utilizes the spanning tree protocol for the

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Rootbridge ITT-270 STP, Root Bridge, PortFast, BPDU Guard, and EtherChannel Guide

Directions: This assignment utilizes the spanning tree protocol for the purpose of determining the best ways to route data based upon root bridge technologies. STP is a listening-learning protocol, so sometimes it takes a while for it to become fully functional. We will learn ways to avoid those delays using PortFast and BPDU Guard. To complete this assignment, follow the guidelines provided below. At the end of this document you will find the related assignment questions; submit only the completed questions portion to your instructor. Note: At various points you will be required to obtain a screen capture; add this directly into the document following the related question.

Guidelines

For this week’s assignment, set it up as follows:

(Todd, 2016)

This week’s assignments are written to be used with 2960 switches. Feel free to use any of the simulators to work through the objectives.

1. From the S3 switch, use the show spanning-tree vlan 1 command. Verify the output.

Before continuing, answer questions 1 through 4 below.

2. From S1, show spanning-tree summary

a. Sh cdp neighbors

b. sh spanning-tree summary

Before continuing, answer questions 5 and 6 below.

Reflection: From S3, what is the bridge ID for VLAN 1?

3. Type the following command on Switch 3:

a. show spanning-tree vlan 1

Before continuing, answer questions 7 and 8 below.

4. Let’s make S3 the root bridge for VLAN 1. Use priority 16,384, which is lower than the 32,768 of the current root. Type the following commands:

a. spanning-tree vlan 1 priority ?

b. spanning-tree vlan 1 priority 16384

c. exit

5. Verify the root bridge for VLAN 1 by typing the following command:

a. sh spanning-tree vlan 1

Before continuing, answer question 9 below.

6. Look at the diagram for this network.

Before continuing, answer question 10 below.

7. Change to the S3 Switch and enable PortFast for the interface.

Before continuing, answer question 11 below.

8. Continue by typing the following commands:

a. config t

b. int fa0/2

c. spanning-tree portfast

Before continuing, answer question 12 below.

PortFast has been configured, but it won’t work until the interface is in non-trunking mode.

Before continuing, answer question 13 below.

9. Let’s turn on BPDUGuard by typing the following command:

a. spanning-tree bpduguard enable

Reflection: What will happen as a result of this command?

10. Look at the current settings for fa0/2.

Before continuing, answer question 14 below.

Capture the screen (Screenshot 1) and place it with the related question below.

11. Now, we begin playing with EtherChannel by creating a port channel interface by typing the following commands:

a. config t

b. inter port-channel 1

c. exit

12. Now that the port channel is created, we need to assign interfaces to that port by typing the following command:

a. int range gi0/1 – 2

b. channel-group 1 mode ?

Capture the screen (Screenshot 2) and place it with the related question below.

Before continuing, answer question 15 below.

13. Continue by typing the following command:

a. channel-group 1 mode desirable

Capture the screen (Screenshot 3) and place it with the related question below.

Before continuing, answer question 16 below.

14. Configure the S2 switch with EtherChannel, using the same parameters as S3 by typing the following commands:

a. config t

b. interface port-channel 1

c. exit

d. int rang gi0/1 – 2

e. channel-group 1 mode desirable

Capture the screen (Screenshot 4) and place it with the related question below.

Before continuing, answer question 17 below.

15. Continue by typing the following command:

a. sh etherchannel port-channel

Capture the screen (Screenshot 5) and place it with the related question below.

16. Continue by typing the following command:

a. sh etherchannel summary

Capture the screen (Screenshot 6) and place it with the related question below.

Before continuing, answer question 18 below.

ITT-270 STP and Root Bridge Questions

Complete the following questions as required by the prompts within the guidelines above.

1. Is S3 the root bridge? Elaborate on how you came to this conclusion.

2. What port is the root port?

3. What does the cost of 19 mean?

4. What switch is attached to the other side of that root port?

5. Is S1 a root bridge? Elaborate on how you came to this conclusion.

6. For what VLANs?

7. Is VLAN 1 the root bridge?

8. What is the root port?

9. Why are all the ports in forwarding mode?

10. Considering the data rates for each link, which switch(es) should be root bridge(s) for what VLANs? Why?

11. Why would we want to enable PortFast?

12. What is a bridging loop? How do we avoid it?

13. Is fa0/2 in trunking mode? What command(s) do you use to find out?

14. What’s the command?

15. What is LACP? PAgP? EtherChannel?

16. Why choose desirable?

17. Why does the link state go to up here and not in step 12?

18. What protocol is in use for this channel?

© 2019. Grand Canyon University. All Rights Reserved.

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