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OSN 500 550 580 V100R008C50 Commissioning and Configuration Guide 02

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Testing the Protection Switching Schemes on the PSN Network

Testing the Protection Switching Schemes on the PSN Network

The protection switching schemes configured for a PSN network protect the services on the network. To ensure that the protection switching is normal in the case of a network fault, you need to test the protection switching schemes on the PSN network.

Testing Protection Switching on an MPLS-TP Ring

This topic describes how to implement protection switching on an MPLS-TP ring. The protection switching can be forced switching, manual switching, and exercise switching.

Prerequisites

  • You are an NM user with Administrators rights or higher.
  • The ring protection is created properly.
Tools, Equipment, and Materials

U2000

Background Information
  • OptiX OSN 500, OptiX OSN 550 and OptiX OSN 580 support MPLS-TP ring protection.

  • Protection switching is categorized into forced switching, manual switching, and exercise switching.
    • Forced switching is performed regardless of the status of the protection channel unless the protection channel is responding to a bridging request of a higher priority. You can perform forced switching to restore services if automatic switching fails for some causes.
    • Commands for manual switching take effect only when the protection tunnel involves no signal failure or signal degradation.
    • Exercise switching is used to test the automatic protection switching (APS) protocol. Services are not switched, and only the computation result of the protocol is displayed.

Procedure

  1. Check the protection switching status of the ring to be tested.
    1. Choose Service > IP Protection Subnet > Manage MPLS Protection Ring from the main menu, and then the Manage MPLS Protection Ring and Set Filter Criteria windows are displayed.
    2. Enter the filter criteria in the Set Filter Criteria window to filter the ring to be tested, and click Filter.
    3. In the Manage MPLS Protection Ring window, right-click the ring to be tested, and choose Refresh Switch Status from the shortcut menu.

    4. Click the Topology tab, and check the Westbound Status or Eastbound Status of the ring to be tested. Normally, the status is Idle State.
  2. Perform switching in the east or west direction of a node on the ring and query the post-switching status.
    1. Select a desired node on the ring. In the lower right corner of the Topology tab page, click Eastbound Maintenance or Westbound Maintenance, and choose Force Switching, Manual Switching, or Exercise Switching. In the Confirm dialog box, click OK to perform switching.
    2. Check Eastbound Status or Westbound Status of the tested node to check whether the command has been issued successfully.
  3. Click Clear All at the right bottom of the window, and then the ring protection is restored to normal status.

Testing the MPLS Tunnel APS Protection Switching

On the U2000, you can perform the MPLS Tunnel APS protection switching. The protection switching operations include the forced switching, exercise switching, manual to working, and manual to protection.

Prerequisites

  • You are an NM user with Administrators rights or higher.
  • The MPLS Tunnel APS must be configured.
Tools, Equipment, and Materials

U2000

Background Information
NOTE:
After the MPLS tunnel APS protection scheme is configured, the ping test function and traceroute test function in MPLS OAM cannot be used for the protection channel. Therefore, you need to ensure that the working tunnel and protection tunnel are normal.
Protection switching includes forced switching, manual switching, and exercise switching.
  • A forced switching command is valid only when the protection tunnel is normal and idle, for example, the protection tunnel is not used to respond to higher-priority bridge requests. Forced switching can be used to restore services after automatic switching fails.
  • Commands for manual switching are valid only when there is no signal failure or signal degradation on the protection tunnel. In the case of manual switching, services can be manually switched to a working or protection tunnel.
  • The exercise switching is used to test the APS protocol. In fact, the services are not switched, and only the computation result of the protocol is displayed.

You can verify the MPLS Tunnel APS function according to the following aspects:

  • If a fault is generated on the network, the MPLS Tunnel APS can still be performed normally.
  • If the protection group is set to the revertive mode, the service can be switched from the protection tunnel to the working tunnel after the WTR time expires.
  • All the commands that trigger manual switching can be issued correctly.
Test Connection Diagram
see Figure 1-14, a 2 Mbit/s service is present between Node B and RNC. After the 2 Mbit/s service is encapsulated, it is transmitted through the working tunnel NE1-NE4-NE3 as shown in Figure 1. Because the 2 Mbit/s service has a high requirement for safety, a protection tunnel NE1-NE2-NE3 is created to protect the working tunnel. Then, the 1:1 protection is established between the two tunnels.
Figure 1-14  MPLS test connection diagram

Procedure

  1. If a fault is generated on the network, the MPLS tunnel APS can still be performed normally.
    1. Disconnect the working fiber. For example the fibre between NE1 and NE4.
    2. In the Main Topology, right-click the NE that you want to verify and choose NE Explorer from the shortcut menu.
    3. Choose Configuration > Packet Configuration > APS Protection Management in the Function Tree. In the pane on the right side, select the protection group that you want to verify. Then, click Function > Query Switching Status to check whether the service is switched from the working tunnel to the protection tunnel.
  2. If the protection group is set to the revertive mode and if the working tunnel recovers, the service can be switched from the protection tunnel to the working tunnel after the WTR time expires.
    1. Reconnect the fiber that is disconnected in 1. After the WTR time expires, click Function > Query Switching Status to check whether Active Tunnel is the specified Working Tunnel.
  3. All the commands that trigger manual switching can be issued correctly.
    1. Select the protection group that you want to verify and click Clear under Function. Then, click Query Switching Status under Function to check whether the command is issued successfully.
    2. Repeat the preceding steps to check whether all commands that trigger manual switching, such as Force Switching, Manual Switching to Working, Manual Switching to Protection, Exercise Switching, and Lockout of Protection are issued successfully.

Follow-up Procedure

If testing MPLS tunnel APS protection switching fails, rectify faults by referring to Fault of Tunnel APS Protection Switching.

Testing the MPLS PW APS

The equipment supports MPLS PW APS. The switching commands include forced switching, exercise switching, manual switching to working, and manual switching to protection.

Prerequisites

  • You are an NM user with Administrators rights or higher.
  • The MPLS PW APS protection scheme is configured.
Tools, Equipment, and Materials

U2000

Background Information
NOTE:
After the MPLS PW APS protection scheme is configured, the ping test function in PW OAM cannot be used for the protection channel. Therefore, you need to ensure that the working PW and protection PW are normal.
Switching commands include forced switching, manual switching, and exercise switching.
  • A forced switching command is valid only when the protection tunnel is normal and idle, for example, the protection tunnel is not used to respond to higher-priority bridge requests. Forced switching can be used to restore services after automatic switching fails.
  • Commands for manual switching take effect only when there is no signal failure or signal degradation on the destination PW of the protection switching. In the case of manual switching, services can be manually switched to a working or protection channel.
  • Exercise switching is used to test the APS protocol. In fact, the services are not switched, and only the computation result of the protocol is displayed.
You can verify the MPLS PW APS function in the following aspects:
  • When a fault is generated on the network, MPLS PW APS can be performed normally.
  • All the commands that trigger manual switching can be issued correctly.
  • When the protection group is set to the revertive mode, the service can be switched from the protection channel to the working channel after the WTR time expires.
Test Connection Diagram
A 2 Mbit/s service is present between the Node B and the RNC. After being encapsulated, the 2 Mbit/s service is transmitted through the working PW of NE1-NE4-NE3, as shown in Figure 1-15. A protection PW of NE1-NE2-NE3 is created to protect the working PW because the 2 Mbit/s service has a high requirement for safety. The two PWs form MPLS APS 1:1 protection.
Figure 1-15  MPLS test connection diagram

Procedure

  1. When a fault is generated on the network, MPLS PW APS can be performed normally.
    1. Remove the optical fibers on the working channel, such as the optical fibers from NE1 to NE4.
    2. Right-click the required NE in the Main Topology, and choose NE Explorer from the shortcut menu.
    3. Choose Configuration > Packet Configuration > APS Protection Management from the Function Tree.
    4. Click the PW APS Management tab. In the tab page, select the required protection group and choose Function > Query Switching Status to check whether the switching is normal.
  2. When the protection group is set to the revertive mode and the working PW recovers, the service can be switched from the protection PW to the working PW after the WTR time expires.
    1. Reconnect the optical fibers that are disconnected in 1. After the WTR time expires, choose Function > Query Switching Status to check whether the value of Working PW ID is the same as that specified.
  3. All the commands that trigger manual switching can be issued correctly.
    1. Select the protection group to be verified, and click Clear below Function. Then, click Query Switching Status below Function to check whether the command is issued successfully.
    2. Repeat the preceding steps to check whether all commands that trigger manual switching are issued successfully, such as Forced Switching, Manual Switching to Working, Manual Switching to Protection, Exercise Switching, and Lockout of Protection.

Testing ERPS Switching

You can verify whether the ERPS function is in the normal state by checking the port status of the ERPS protection group before and after the switching.

Prerequisites

  • You are an NM user with Administrators rights or higher.
  • The equipment is configured with ERPS.
  • The network cable for carrying the working and protection Ethernet services of ERPS is properly connected.
Tools, Equipment, and Materials

U2000

Test Connection Diagram

As shown in Figure 1-16, the following procedures use the Ethernet services that are configured with ERPS between NE A and NE D as an example. The RPL owner node is NE D.

Figure 1-16  Configuration for testing ERPS
NE A, NE B, NE C, and NE D are configured as follows:
  • West ETH board: 3-EM6F-1
  • East ETH board: 3-EM6F-2


Procedure

  1. Before the switching, query the status of the protection group that is configured on NE D.
    1. Select the NE from the Object Tree in the NE Explorer of NE D, and choose Configuration > Packet Configuration > Ethernet Protection > ERPS Management from the Function Tree.
    2. Select the ERPS protection group to be queried, and click Query.
    3. The value of State Machine Status should be Idle.



  2. Refer to Testing Packet Ethernet Services to test availability of the Ethernet services.
    The LossRate in the Detection Result should be 0.
  3. Disable the west Ethernet port 3-EM6F-1 on NE A.
    1. In the NE Explorer of NE A, select the desired Ethernet board and choose Configuration > Interface Management > Ethernet Interface from the Function Tree.
    2. Click the Basic Attributes tab.
    3. Select the desired port and set Enable Port to Disabled.
    4. Click Apply.
  4. After the switching, query the status of the protection group that is configured on NE D.
    1. Select the NE from the Object Tree in the NE Explorer of NE D, and choose Configuration > Packet Configuration > Ethernet Protection > ERPS Management from the Function Tree.
    2. Select the ERPS protection group to be queried, and click Query.
    3. The value of State Machine Status should be Protection.
  5. Refer to Testing Packet Ethernet Services to test availability of the Ethernet services.
    The LossRate in the Detection Result should be 0.
  6. Enable the west Ethernet port 3-EM6F-1 on NE A.
    1. In the NE Explorer of NE A, select the desired Ethernet board and choose Configuration > Interface Management > Ethernet Interface from the Function Tree.
    2. Click the Basic Attributes tab.
    3. Select the desired port and set Enable Port to Enabled.
    4. Click Apply.

Testing Packet-based LMSP Switching

For a chain network, packet-based linear MSP can be configured to improve link transmission reliability.

Prerequisites

  • You must be an NM user with NE operator authority or higher.
  • The Packet-Based linear MSP must be created and configured on the U2000.
Tools, Equipment, and Materials

U2000

Procedure

  1. Check the switching status of the Packet-Based Linear MSP protection group under test.
    1. On the Main Topology of the U2000, right-click the NE configured with Packet-Based Linear MSP. Choose NE Explorer from the shortcut menu to display the NE Explorer window.
    2. In the Function Tree of NE Explorer, choose Configuration > Packet Configuration > Packet-based Linear MS.
    3. Click Query and choose Query Protection Group from the shortcut menu to refresh the configuration of protection groups on the NE.
    4. Click Query and choose Query Switching Status from the shortcut menu. Then, check West Switching Status of the working and protection units in the protection group under test. West Switching Status of both units should be Idle.
  2. Disable the working port of the LMSP protection group under test.
    1. In NE Explorer, select the board configured with the LMSP protection and choose Configuration > Packet Configuration > Interface Management > SDH Interface from the Function Tree.
    2. On the General Attributes tab, select the working port in the Packet-Based Linear MSP protection group and set Laser Interface Enabling Status to Close.
  3. Check the switching status. If West Switching Status of either the working unit or protection unit is Switching, it indicates a successful switching.
  4. Disable the working port of the Packet-Based Linear MSP protection group under test with reference to 2.
  5. Revert the services to the working tunnel of the LMSP protection group.
    • If Revertive Mode of the Packet-Based Linear MSP protection group is set to Revertive, the services are reverted to the working tunnel when WTR expires.
    • If Revertive Mode of the Packet-Based Linear MSP protection group is set to Non-Revertive, select the protection group and click the Inter-Board Mapping Relation tab, right-click Protection Unit in Protection Unit, and choose Manual Switching to Working from the shortcut menu.

Testing ML-PPP Protection

This section describes how to test Multi-Link Point-to-Point Protocol (ML-PPP) protection on the U2000.

Prerequisites

  • You are an NM user with Administrators rights or higher.
  • ML-PPP protection has been configured for NE 1 and NE 2 on the U2000.
Tools, Equipment, and Materials

U2000

Context

NE 1 and NE 2 are interconnected using their CQ1 boards and configured with ML-PPP protection.

Procedure

  1. Check the encapsulation attributes of serial interfaces configured for NE 1 and NE 2.
    1. In the main topology, right-click NE 1 and choose NE Explorer from the shortcut menu. The NE Explorer window is displayed.
    2. Choose Configuration > Packet Configuration > Interface Management > Serial Interface from the function tree.
    3. Click Query. Information about the serial interface configured for NE 1 is displayed on the General Attributes tab page.
    4. Check Port Mode. The expected value is Layer 3. Then, check Encapsulation Type. The expected value is PPP.



    5. Repeat 1.a to 1.d to check the encapsulation attributes of the serial interface configured for NE 2.
  2. Check information about maintenance point (MP) groups configured for NE 1 and NE 2.
    1. Enter NE 1's NE Explorer and choose Configuration > Packet Configuration > Interface Management > MP Group Management from the function tree.
    2. Click Query. Information about the MP group configured for NE 1 is displayed on the General Attributes tab page. Then, check Enable Tunnel. The expected value is Enable.



    3. Repeat 2.a to 2.b to check information about the MP group configured for NE 2.
  3. Change the frame mode of NE 1's port connecting NE 1 to NE 2, and ensure that the interconnected ports on NE 1 and NE 2 use different frame modes.
    1. Enter NE 1's NE Explorer, select the CQ1 board from the object tree, and choose Configuration > Interface Management > Path Configuration from the function tree.
    2. In the Path Configuration dialog box, right-click Frame Mode of the port connecting NE 1 to NE 2 and choose 30 from the drop-down list. At this time, the interconnected ports on NE 1 and NE 2 use different frame modes, because NE 2's port connecting NE 2 to NE 1 takes the default value 31.

      NOTE:

      The default value of Frame Mode is 31. As Frame Mode is not changed for NE 2, Frame Mode of NE 2's port connecting NE 2 to NE 1 takes the default value 31.



    3. Click Apply.
  4. Check the status of the PPP link on NE 1.
    1. In NE 1's MP Group Management window, select the desired MP group. Information about members of the MP group is displayed on the Member Attribute tab page. Then, check PPP Link Status. The expected value is DOWN, indicating that ML-PPP fails.



  5. Change the frame mode of NE 1's port connecting NE 1 to NE 2 and ensure that the interconnected ports on NE 1 and NE 2 use the same frame mode.
    1. In NE 1's Path Configuration dialog box, right-click Frame Mode of the port connecting NE 1 to NE 2 and choose 31 from the drop-down list. At this time, the interconnected ports on NE 1 and NE 2 use the same frame mode.



    2. Click Apply.
  6. Check the status of the PPP link on NE 1 again.
    1. In NE 1's MP Group Management window, select the desired MP group. Information about members of the MP group is displayed on the Member Attribute tab page. Then, check PPP Link Status. The expected value is UP, indicating that ML-PPP is operating normally.



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Updated: 2019-01-21

Document ID: EDOC1100020976

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