Exercise 3.1: Decode the RSVP-TE Message

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Exercise 3.1: Decode the RSVP-TE Message

There are several ways to complete this lab. The exercise itself is written in standalone form so that you do not need any products to complete the exercises. Just skip the hands-on block.

Hands-On 

If you are the “hands-on” type and you want to see MPLS packets on a protocol analyzer, you will need two items of software: a copy of Ethereal (www.ethereal.com) and the sample (www.ethereal.com/sample) called MPLS-TE. (If you do not have a link to the Internet, you can find these captures in the appendix.)

If this is the only protocol analyzer present on your computer, you can open the file called MPLS_basic by clicking on it. If you have another protocol analyzer, you will have to open the Ethereal program and open the file from the menu:

1. From your desktop, go to Start | Programs; find and double-click Ethereal.

2. Once the Ethereal program opens, open the file called MPLS_TE.

3. Wait for the file to open. It will take a few minutes.

4. Find frames 3 and 4 (RSVP).

5. Follow the steps in the lab.

RSVP Path Request

In this portion of the lab, you will review RSVP-TE and look for the path and the label request.

1.	Look at Frame 3 in Figure 3.25. Figure 3.25: RSVP Overview
2.	Find and highlight the strict routing path in Figure 3.26. Figure 3.26: RSVP Detail
3.	For what type of traffic is the label requested?
4.	What is the C-Type on the request?

Answers

1.
2.	210.0.0.2 204.0.0.1 207.0.0.1 202.0.0.1 201.0.0.1 200.0.0.1 16.2.2.2
3.	19 Label Request Object
4.	1

RSVP Path Request

In this portion of the lab, you will review RSVP-TE and look for both the RSVP reservation type and the assigned label.

1. Look at Frame 4 in Figure 3.27 and in detail in Figure 3.28.

   
   Figure 3.27: Frame 4

   
   Figure 3.28: RSVP Path Request

RSVP Reservation Details

1.	What LSP was assigned?
2.	What label was assigned?

Answers

1.	1
2.	16

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