Spirent TestCenter · Two Spirent TestCenter™ ports ... Continue adding ANCP commands to the command list on the right until your list ... Select the first DSLAM to display the

Test Methodology Journal

ANCPSpirent TestCenterNovember 2008

Inspired Innovation

Spirent Communications Test Methodologies ANCP

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Dynamic Rate Allocation with ANCP

Associated Standards • draft-wadhwa-gsmp-l2control-configuration-00 • draft-ietf-ancp-protocol-02

Objective Verify the DUT can properly adjust traffic rates based on the DSL Line Profile updated. This test will also demonstrate how to use the ANCP feature, Asymmetric Throughput test and the Command Sequencer.

Overview This test analyzes the performance of dynamic rate allocation of the device. The Device Under Test (DUT) is configured for two DSLAMs, each with unique DSL Line Profiles. Two Spirent TestCenter™ ports are connected to two ports on the DUT: one will serve as the DSLAM ports for the ANCP messaging and traffic, and one will serve as the “destination” port. The ports on the DUT are all 100 Mb Ethernet. The port emulating the DSLAMs will establish an ANCP adjacency with the DUT and send Port Up messages for the subscribers on a specific DSL Line Profile. An asymmetric throughput test will be run to determine the throughput value at specified bandwidth via DSL Line Profile. The DSL Line Profile will then be updated to allocate a different upstream/downstream rate, and the asymmetric test will then be run again to determine optimal throughput rates. This test will use the Command Sequencer to execute the test and save the results.

Setup


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1. Launch Spirent TestCenter and reserve the required ports.

2. A couple of protocols need to be enabled. Select the Technologies button to launch the Technology Selector.


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3. Enable DHCP and ANCP. Press OK once completed.

4. Select Routers on the first reserved port and then select Add. We will step through the Router Wizard to create two DSLAM routers.


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5. Only the first port needs to be checked. Verify that it is and press Next.


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6. Enable ANCP and press Next.


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7. Enable the Number of VLAN Headers option, the default value of 1 is okay. Press Next to continue.


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8. Set the number of “VLANs per port” to a value of 2; this will create two routers on the port – one router per VLAN. Also, configure the VLAN ID and the Step values as needed to work with your DUT’s configuration. Press Next to continue.


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9. As the Router ID is not used by ANCP, it is possible to either enable the “Use IPv4 address as router ID” checkbox or leave it disabled. Also, configure the IPv4 address as required to work with your DUT’s configuration. The IPv4 gateway will automatically be configured. As two routers are being configured, the stepping of the IP address might have to be changed. Select the “…” button next to the Step field to make the changes as needed. Press Next once these changes have all been made.


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10. The defaults are okay. It is possible to configure the ANCP version using the drop down menu. Currently supported by TestCenter are Draft Version 00 and 02. If a test needs to be performed using both draft versions of ANCP, one can run the wizard twice and create a single router each time. Press Next to continue, as this test uses the default configuration.


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11. Verify the configuration. Make changes as needed by clicking the Back button or selecting an area in the wizard navigation panel on the left-hand side. Press Finish once completed.

12. Once the routers have been created, select the ANCP tab. Rename the routers DSLAM 1 and DSLAM 2. Next, press the Access Loop Generator toolbar button. This will launch a wizard that will create subscribers and access loops.


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13. Select just DSLAM 1. On DSLAM 1, we will create a Host that uses DHCP. The ANCP Version combo box is for filtering the Router list on the left hand side. This test will use Draft 00, so the default ANCP Version filter will suffice. Press Next to continue.


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14. The defaults are okay as DHCP is already enabled. Press Next to continue.


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15. Scroll to the right until the Subscriber VLAN ID column is visible. Configure the value as needed. This step creates a single host that is editable under the Host navigation section in the navigation window. Press Next once done.


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16. The defaults are okay; however, if additional TLVs are required select Actions Add TLV(s). If no additional TLVs are required, press Next.


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17. If no additional TLVs were added, skip this step. Depending on the required TLV, select it from the list and press OK. If the TLV you require is not in the list, select Custom TLV as this provides the ability to enter your own hex string as a TLV. Press Next in the Access Loop Generator when all configuration has been completed.

18. Before we can continue with the configuration, Line Profiles need to be created. Select the Edit Line Profiles button.


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19. Select the Add button to start the creation of a Line Profile.

20. With the newly created Line Profile highlighted, select Edit TLVs.


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21. It is possible to change the DslType value using the drop down menu. Change this value as necessary. Also, set both Rate values and select Actions Add TLV(s).


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22. Select the Maximum Interleaving Delay Upstream TLV and select OK. It is possible to add multiple TLVs as needed, select the required TLV from the list and press OK.


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23. Expand the Maximum Interleaving Delay Upstream TLV and configure the Time value. Once completed, press OK.


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24. During this test, we will change the Line Profile to a new one. As we are at this location already, let’s create a second Line Profile to be used later on. Repeat the previous five steps, except make sure both Rate values differ.


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25. Two Line Profiles should have been created. Press Close to continue.


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26. Select the first profile and notice it assigns the Host to that profile. Press Finish. A Host that uses DHCP has now been linked to DSLAM 1. Next, we will create a Host with a static IP that is linked to DSLAM 2.

27. Again, select the Access Route Generator button.


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28. Select the DSLAM 2 router this time and press Next.


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29. Select None as the Session Protocol and press Next.

30. Scroll to the right and set the correct Subscriber VLAN ID.


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31. Scroll more to the right and configure the IPv4 address and gateway so they match the subnet to which the DSLAM is connected. Press Next once completed.


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32. The defaults are okay, press Next. Though it is possible to add TLVs as needed.


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33. Verify AncpDslLineProfile 1 is selected and there is a single Host assigned to the profile. Press Finish once completed.


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34. To test the ANCP protocol, an endpoint needs to be available to transmit traffic across the DUT. A single Host will be used as the endpoint in this test. In the navigation window, select Hosts under the second reserved port and press the Add button.


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35. Only the second port should be selected, press Next.


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36. The defaults are okay, press Next to continue.


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37. Again the defaults are okay, press Next to continue. If your DUT requires the use of a VLAN, enable the “Number of VLAN Headers” and configure appropriately.


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38. Configure the correct IPv4 address to match the subnet of the connection. The IPv4 gateway should automatically be configured. Press Next once completed.


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39. Verify the Host is configured correctly and press Finish.

40. Select the Wizards button.


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41. Select Test Wizards Asymmetric Performance Test Package and press Next.


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42. We wish to perform a throughput test, select the Asymmetric Throughput Test option and press Next.


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43. Activate both ports. Configure the first port – the one both DSLAM routers are configured on – to be the Downstream. The second port will be the Upstream. Press Next once completed.


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44. We previously configured the required items for this wizard section, press Next to continue.


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45. Again, this was previously configured, press Next to continue.


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46. We are only going to send traffic upstream. Select Traffic Flows Direction Upstream If bidirectional traffic is required, set Traffic Flows Direction Bidirectional and press Next.


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47. ln Frame Size Custom, delete the 64-byte frame size. Due to frame size limitations, it is not possible to run this test using a 64-byte frame size, which is why it must be removed from the Custom list for the test to be performed. Press Next .


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48. Change the Throughput Search Search mode to Step, or if you require a Binary search you can leave the Search mode at Binary. Press Finish.


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49. The Command Sequencer now contains several elements. Changes will be made to add in ANCP into this test. Press the Edit Sequence button to start making changes.

50. Use the Command Category Filter drop down menu and select ANCP.


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51. Select ANCP: Initiate Adjacency and select the right arrow. This will add it to the command list on the right side. Make sure this is the first item in the list; you might have to use the Move Up button to do so.

52. Perform the same action with ANCP Wait for Adjacency to Establish. Make sure it follows ANCP: Initiate Adjacency.


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53. Continue adding ANCP commands to the command list on the right until your list looks exactly as the below image.


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54. Double-click on ANCP: Initiate Adjacency. This will bring up a new window that will let you select the routers you wish to have the adjacency initiated on. Select both DSLAM routers and press OK.


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55. Next, double-click ANCP: Wait for Adjacency to Establish. This will bring up a new window. In the “Options to Wait for” row, use the drop down menu and select both DSLAMs. Press OK once completed.

56. Repeat the previous two steps for ANCP: Port Up and ANCP: Wait for All PortUps to be sent.


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57. Double-click ANCP: UnMap Subscribers. This will open a new window, where the following steps

will have to be repeated for each DSLAM router. Select the first DSLAM to display the Access Loops associated with the selected DSLAM. Next, select the correct Line Profile and then press Add. In the image below, these steps have already been performed on DSLAM 1 and are being shown for DSLAM 2. Once these steps have been completed for both DSLAMs, select OK.


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58. Double-click ANCP: Map Subscribers. This will launch a new window where the following steps will be performed for each DSLAM. Select the first DSLAM under ANCP Nodes. This will display the Access Loops associated with the selected DSLAM. Next, select the second Line Profile and press Add. Repeat for the other DSLAM. Once completed, press OK.


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59. For the remaining four ANCP commands, repeat either Step 51 or Step 52 as required.

60. The entire configuration for ANCP is now completed. However, one last command needs to be added to the command list. Change the Command Category Filter to All Commands and scroll down till Learning: Start ArpNd is located. Add this command to the list making sure it is before the DHCPv4 commands.


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61. Double-click the newly added Learning: Start ArpNd command. This will open a new window. Verify “Port, Stream Host or Router handle list” is set to a value of Project 1 and Wait for Arp To Finish is set to True. Press OK once completed.


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62. Highlight from ANCP: Port Up to ANCP: Map Subscribers. Right-click and select Add Commands To Loop.

63. Double-click the newly added Loop object and change the “Fixed Number of loops” to a value of 2. Press OK once completed.


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64. It is possible to leave this step out if you plan to monitor the test closely. Right-click on ANCP: UnMap Subscribers and select Insert Breakpoint. This will allow the ability to make sure the new line policy takes place on the DUT, as the test will take a decent amount of time to run. Inserting the breakpoint here forces you to continue the test once this location has been reached.


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65. The Command Sequencer is now configured correctly. It should look very similar to the below image. Press Okay once satisfied with the configuration.


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66. In the Command Sequencer, press the green triangle button to start the test.

67. Once the test has been initiated, a dialogue box might appear asking to launch Results Reporter, select Yes.


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68. While the test is running, it is still possible to view results. Change the Results view to Port Traffic Basic Traffic Results and Router Protocols ANCP Router Results. Use the Change Result View

to change the views as needed. Also, make sure each DSLAM Router has the Established state for Adjacency State and Subscriber State.


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69. Login to the DUT to verify that ANCP is successfully running. The first command shows the correct Line Profiles are in use, while the second command shows everything is established and running correctly.


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70. This depends on whether a pause has been placed in the Command Sequencer. If a pause has been placed in the Command Sequencer, eventually it will come to the pause. Once it comes to the pause, press the green triangle button. At this point, all subscribers have been unmapped.


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71. After the ANCP: Map Subscribers command has completed, login to the DUT again and verify the Line Profile has been changed and ANCP is successfully running.


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72. While the test is running, it is possible to view different results in Results Reporter. Navigate the Results Reporter to view a great deal of information. Two different Rfc2544-Tput-Summary’s will be visible once the test has completed. This is due to running the test with two different Line Profiles. Expand the Trial Results section of each one, and view the different iterations for each frame size to determine what passed and what failed.


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73. After the result for each iteration has been viewed, select the Rfc2544 Throughput Port Side Results. This results view provides a quick way to determine the result for each frame size and the Offered Load. The Offered Load is the combined load of both DSLAM routers.

74. Select the Rfc2544 Throughput Stream Block Results. This will provide information about each

Stream Block from each Frame Size. StreamBlock 1 represents DSLAM 1 and StreamBlock 2 represents DSLAM 2 for each frame size. This provides the ability to determine the Offered Load for each DSLAM and to determine if it passed or failed.


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75. The Command Sequencer will pause if it has been inserted. Press the green triangle button again to complete the test.

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© 2008 Spirent Communications, Inc. All of the company names and/or brand names and/or productnames referred to in this document, in particular the name “Spirent” and its logo device, are eitherregistered trademarks or trademarks pending registration in accordance with relevant national laws.All rights reserved. Specifications subject to change without notice.

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Documents

Spirent TestCenter · Two Spirent TestCenter™ ports ... Continue adding ANCP commands to the command list on the right until your list ... Select the first DSLAM to display the