TABLE OF CONTENTS In an MPLS network, the LERs serve as quality of service (QoS) decision points. One method to establish these policies is to use the port numbers in Layer 4 of a packet The tradeoffs in establishing these policies come from how much granularity is needed versus how manageable the configurations and tables are.
In the first example, we have created an MPLS LER table with three criteria: rules on IP address only, IP and protocol number, and IP protocol and port number.
Additionally, we have established routing paths A Z, and we call them forward equivalence classes, or FECs. The FEC A paths are the highest-quality paths, and the FEC Z paths are the lowest-quality paths.
The policies use the port numbers to place traffic on particular paths. Port numbers are:
20/21 FTP, 25 E-Mail, 80 HTTP, 443 HTTPS, 520 Routing
| 1. | Examine the table and determine the table with the most entries: |
|
| 2. | In Table1. 1, using the IP protocol, and port number sections, how would HTTPS be handled in relationship to HTTP? |
|
| 3. | Describe a circumstance in which HTTPS should be handled differently from HTTP. |
|
| 4. | What FEC classification is given to routing? |
|
| 5. | How could giving the previous classification to routing become a problem? |
|
Answers
| 1. | The table with the most entries is the table that sorts by IP address, protocol number, and port number. |
| 2. | HTTPS uses FEC A, whereas HTTP uses... |
