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Typical Configuration Examples

SD-WAN V100R018C00

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Rolling Back from Single-CPE Single-Link (Internet) Networking to Dual-CPE Dual-Link (MPLS and Internet) Networking

Rolling Back from Single-CPE Single-Link (Internet) Networking to Dual-CPE Dual-Link (MPLS and Internet) Networking

Related Products

Agile Controller-Campus: V300R003C00

AR: V300R003C00

Networking Requirements

The branch site, Site1, of an enterprise originally uses two CPEs as the gateways and connects to the WAN through an MPLS link and an Internet link. After the site change operation, Site1 only uses the Internet link to connect to the WAN. However, a fault occurs during the trial running phase after the change. Site1 needs to roll back to the dual-CPE dual-link networking (MPLS and Internet).

In the trial running phase, the old site configured on the Agile Controller-Campus has not been deleted. To facilitate site change, you are not advised to delete the new site from the Agile Controller-Campus.

Figure 4-10 Networking to be rolled back

Solution Design

  1. On the Agile Controller-Campus, check the old and new branch sites.
    • Both the old and new branch sites exist on the Agile Controller-Campus.
    • The new site uses the CPE Site1_2, which has a real ESN.
    • The old site uses two CPEs: Site1_1 and Site1_2_dummy1, which have a real ESN and a virtual ESN, respectively.
  2. Perform the rollback on the Agile Controller-Campus.
    • Use Site1_2 (real ESN) of the new site to replace Site1_2_dummy1 (virtual ESN) of the old site so that the old site can use Site1_2.
    • Change the WAN link IP address of the old site to the actual IP address.
  3. At the branch site, deploy the physical connections for the CPEs to connect to the WAN and perform deployment for the CPEs again.
  4. After the CPEs are deployed, they automatically obtain the modified configuration from the Agile Controller-Campus.

Figure 4-11 shows the detailed operation flowchart.

Figure 4-11 Operation flowchart

Data Plan

Table 4-14 Information about device

Device ESN

Device Name

Device Model

Description

2102351BTJ10H1000113

Site1_2_dummy2

AR161EW

a virtual ESN

Procedure

  1. Log in to the Agile Controller-Campus as a tenant administrator.
  2. Add the new device Site1_2_dummy2 that uses a virtual ESN in ESN mode to replace the CPE of the new site so that the CPE can register with the old site after the deployment.

    When setting the virtual ESN, you can change any of the last six digits of the ESN corresponding to the CPE at the old site to use the new ESN as the ESN of the CPE at the new site. The new ESN must be unique in the system.

    1. Choose Device Management > Device List. The Device List page is displayed.
    2. Click Add Device. Set Addition method to Manually create.
    3. Set Mode to ESN, and click Add.
    4. On the page that is displayed, set Type, Device Name, and Description, and click Submit.
    5. Click OK.

  3. Use Site1_2_dummy2 (virtual ESN) to replace the CPE at the new site.

    1. Choose Device Management > Device List. The Device List page is displayed.
    2. In the device list, find the CPE of the new branch site. Click in the Operation column of the CPE record. The Device Replacement page is displayed.
    3. In the new device list that is displayed, select Site1_2_dummy2 (virtual ESN) and click OK.

    1. Check the ESNs of the two CPEs. The ESN of Site1_2_dummy2 changes to a real ESN, and the ESN of Site1_2 changes to a virtual ESN.

  4. Use Site1_2_dummy2 (real ESN) to replace Site1_2_dummy1 (virtual ESN) at the old site.

    1. Choose Device Management > Device List. The Device List page is displayed.
    2. In the device list, find the CPE of the new branch site. Click in the Operation column of the CPE record. The Device Replacement page is displayed.
    3. In the new device list that is displayed, select Site1_2_dummy2 (real ESN) and click OK.

    NOTE:

    If a registered device with a real ESN is used to replace a device with a virtual ESN, the configuration of the old site will be delivered to the device with a real ESN, conflicting with the original configuration on the device. As a result, the configuration fails and an alarm is generated. In this case, you can ignore the related alarms generated on the device. To prevent the configuration failure alarm, disable the WAN interface on the device with a real ESN or restore the factory default settings for the CPE by holding down the Reset button for at least 5 seconds before the replacement.

  5. Change the WAN link IP address of the new site to a virtual IP address and that of the old site to a real IP address.

    In the system, two sites cannot use the same WAN link IP address. During the rollback, you need to change the WAN link IP address of the new site to a value that does not conflict with those of the other sites and that of the old site to a real IP address.

    1. Change the WAN link IP address of the old site. In this example, you only need to change the IP address of the Internet link.
      1. Choose Configuration > Site > ZTP Configuration. The ZTP Configuration page is displayed.
      2. In the site list on the left, click the old branch site. The WAN Link page displays link information.
      3. Click next to the WAN link that will use the IP address of the new site in the Operation column in the right pane.
      4. In the Set WAN Link dialog box that is displayed, set the IP address to a value that does not conflict with those of the other sites.

      5. Click Apply Changes on the main page.
    2. Change the Internet link IP address of the old site to a real IP address, and click Apply Changes on the main page.

  6. At the branch site, connect the CPEs according to the networking of the old site. Connect the two CPEs to the MPLS and Internet, respectively. Restore the connections between the CPEs and the connections between the CPEs and the LAN side.
  7. Deploy the CPE at the branch site using email-based deployment.

    1. Press and hold the Reset button on the CPE for 5 seconds or longer to restore the factory settings of the CPE.
    2. Wait for a moment until the SYS indicator on the CPE is blinking green slowly, indicating that the CPE has started successfully.
    3. Perform email-based deployment according to section Email-based Deployment.

  8. After the deployment is successful, verify that the CPE registers with the Agile Controller-Campus again to obtain the configuration of the old branch site.
  9. Change the site and device names to facilitate maintenance.
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Updated: 2019-03-04

Document ID: EDOC1100036696

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