During the Resolve Configuration step of the migration, you can optionally add additional uplink interfaces on the desired NSX-T Data Center Edges.

In NSX-T 3.1 or earlier, you can add only one required uplink on each NSX-T Edge node. Starting in NSX-T 3.1.1, a maximum of 15 additional uplinks are supported on each NSX-T Edge node.

In other words, each NSX-T Edge in the topology can have a maximum of 16 uplinks.
  • One required uplink that corresponds to an existing uplink on the NSX-v Edge Services Gateway (ESG).
  • 15 additional (optional) uplinks.

On the Resolve Configuration page, you must first submit inputs to resolve feedback messages that are displayed for adding the required uplink on each NSX-T Edge node corresponding to an existing uplink on each NSX-v Edge Services Gateway. After the feedback messages for the required uplinks are resolved for each NSX-T Edge, follow the steps in this procedure to add additional uplinks (if necessary) on the desired NSX-T Edges.

The default recommendation of the migration coordinator is to skip the feedback message for creating additional uplinks on the NSX-T Edges. If you accept the default recommendation, no additional uplinks are created during the migration.

Example
Assume that your NSX-v topology has two north-facing ESGs configured in ECMP and connected to upstream physical ToR switches. The existing uplink interfaces on the two ESGs have the following configuration:
  • ESG-1: The uplink of this ESG is attached to a Public-DVPG1 port group, which uses VLAN 13. The uplink IP is 40.40.40.2/24.
  • ESG-2: The uplink of this ESG is attached to a Public-DVPG2 port group, which uses VLAN 16. The uplink IP is 20.20.20.2/24.

The migrated NSX-T topology contains two NSX-T Edges (Edge-1, Edge-2) in an active/active configuration. Your objective is to add one additional uplink on both Edge-1 and Edge-2 during the Resolve Configuration step of the migration.

The procedure in this topic explains the workflow to add two additional uplinks for this example.

Note: If the migrated NSX-T topology contains NSX-T Edges in an High Availability (HA) configuration, the feedback messages vary slightly. However, the overall workflow remains the same. You must follow the messages in the UI and submit appropriate inputs to resolve the feedback messages. In the procedure, additional notes are included wherever necessary to explain the functionality when the topology contains Edges in HA configuration.

Prerequisites

For the existing uplinks on the NSX-v ESGs, corresponding required uplinks on the NSX-T Edges must be added.
  • On Edge-1, add uplink IP 40.40.40.2/24, which uses VLAN 13
  • On Edge-2, add uplink IP 20.20.20.2/24, which uses VLAN 16

Procedure

  1. On the Resolve Configuration page, click the following feedback message:
    Enter the number of additional uplinks needed.
    Note: If the NSX-T topology contains Edges in an HA configuration, enter the number of additional uplinks you want to add on an Edge node. Migration coordinator automatically adds the same number of additional uplinks on the other redundant Edge node in the HA pair. The maximum limit for additional uplinks on an Edge node is 15.
    For the example explained earlier, the NSX-T Edges are in an active/active configuration. In this case, you must enter the total number of uplinks that are required for all the active Edges in the topology. That is, enter 2 to create two additional uplinks, and submit this input to the migration coordinator.

    If you skip this feedback message, no additional uplinks are created. The remaining steps in this procedure are not applicable.

  2. Click the following feedback message:
    Select an Edge Transport Node for additional uplinks. See System > Fabric > Nodes > Edge Transport Nodes for available Edge Transport Nodes in NSX-T.
    Note: This feedback message is displayed only when an NSX-T topology contains Edges in an active/active configuration. If the topology contains Edges in an HA configuration, migration coordinator selects the active NSX-T Edge node automatically for creating the additional uplinks. In this case, go directly to step 3.

    As you entered 2 in the earlier step, the migration coordinator displays two additional uplink instances named Additional Uplink-1 and Additional Uplink-2. Select an NSX-T Edge node for each additional uplink instance, and submit the input to the migration coordinator.

    For the example explained earlier, select Edge-1 for additional uplink-1 instance, and Edge-2 for additional uplink-2 instance.
    After selecting the Edge transport node for additional uplinks, the migration coordinator displays feedback messages to enter the IP address and VLAN ID for each additional uplink. You can perform the subsequent steps 3 and 4 in any order.
  3. Click the following feedback message:
    Enter the IP address for additional uplink.

    The additional uplink IP address on an NSX-T Edge must not belong to the subnet of an existing uplink interface on the same NSX-T Edge node.

    Note: If the topology contains NSX-T Edges in HA configuration, the migration coordinator displays separate feedback messages to add IP addresses for additional uplinks on the both the Edges in the HA pair. You must ensure that the IP addresses of the additional uplink instances on both the Edges in the HA pair are in the same subnet, but the IP addresses must be different.
    For the example explained earlier:
    • Enter 30.30.30.2/24 for the additional uplink on Edge-1.
    • Enter 10.10.10.2/24 for the additional uplink on Edge-2.
    After specifying the additional uplink IP addresses, submit the inputs to the migration coordinator.
  4. Click the following feedback message:
    Enter VLAN ID for additional uplink.
    The VLAN ID for additional uplinks must satisfy the following conditions:
    • It must be different from the VLAN that is used for the Edge TEP.
    • It must be different from the VLAN that is used for the existing uplink on the same NSX-T Edge node.
    Note: If the topology contains NSX-T Edges in an HA configuration, you must add the VLAN ID for the additional uplinks on only one Edge node. The migration coordinator automatically adds the same VLAN ID for the additional uplinks on the other redundant Edge node in the HA pair.
    For the example explained earlier, enter VLAN ID 18 for 30.30.30.2/24 uplink on Edge-1, and 20 for 10.10.10.2/24 uplink on Edge-2.
    After specifying the VLAN IDs for additional uplinks, submit the inputs to the migration coordinator.
  5. (Optional) After you have resolved all the feedback messages for additional uplinks to green, assume that you want to edit the total number of additional uplinks to 3.

    Click the feedback message mentioned in step 1, and edit the total number of uplinks to 3.

    When you submit the revised input to the migration coordinator, additional feedback messages are displayed to select the Edge transport node, uplink IP, and VLAN ID for this additional uplink-3 instance. Resolve the additional feedback messages by using the same process, as explained in steps 2, 3, and 4 earlier.

    Now, if you again decide to revert the total number of uplinks to original value 2, and submit the revised input, migration coordinator shows warning messages for the additional uplink-3 instance. To resolve the warnings, accept the default recommendation to skip the additional uplink-3 instance, the uplink IP, and the VLAN ID of this instance.

What to do next

After finishing the Migrate Configuration step, verify that the required uplinks and the additional uplinks are created on the tier-0 gateway.

For this example, navigate to the tier-0 gateway in the NSX-T NSX Manager UI, and verify that the tier-0 gateway shows the following uplinks with status as Success:
  • uplink1: 40.40.40.2/24
  • uplink2: 20.20.20.2/24
  • uplink3: 30.30.30.2/24
  • uplink4: 10.10.10.2/24