Configure a Virtual SD-WAN Interface

If you aren’t using Auto VPN configuration with Panorama, configure a virtual SD-WAN interface to group multiple SD-WAN-capable Ethernet interfaces.
If you use Auto VPN configuration through Panorama, it creates the SD-WAN interfaces for you, in which case you don’t create and configure a virtual SD-WAN interface.
If you aren’t using Auto VPN configuration through Panorama, create and configure a virtual SD-WAN interface to specify one or more physical, SD-WAN-capable ethernet interfaces that go to the same destination, such as to a specific hub or to the internet. In fact, all links in a virtual SD-WAN interface must be the same type: all VPN tunnel links or all direct internet access (DIA) links.
The first figure illustrates an example of an SD-WAN interface named SDWAN.1 that bundles two physical interfaces, which use different carriers: Ethernet1/1 (the cable modem link) and Ethernet1/2 (the fiber service link). Both links are a VPN tunnel from the branch to the hub.
In this figure, both links in the SD-WAN interface happen to use the same link tag (Cheap Broadband), but links in an SD-WAN interface can have different link tags.
In the following figure, SDWAN.2 bundles Ethernet1/1 and Ethernet1/2 links, which are both DIA links from the branch to the internet:
  1. Select
    Network
    Interfaces
    SD-WAN
    and select the appropriate template from the
    Template
    context drop-down.
  2. Add
    a logical SD-WAN interface by entering a number (in the range 1 to 9,999) after the
    sdwan.
    prefix.
    Auto VPN configuration creates SD-WAN interfaces numbered .901, .902, and so on, so do not use these numbers.
  3. Enter a descriptive
    Comment
    .
    Add a helpful comment, such as
    Branch to internet
    or
    Branch to western USA hub
    if you are on the Branch template. Your comment makes troubleshooting easier rather than trying to decipher auto-generated names in logs and reports.
  4. On the
    Config
    tab, assign the SD-WAN interface to a
    Virtual Router
    .
  5. Assign the SD-WAN interface to a
    Security Zone
    .
    The virtual SD-WAN interface and all of its interface members must be in the same Security zone, thus ensuring the same Security policy rules apply to all paths from the branch to the same destination.
  6. On the
    Advanced
    tab,
    Add
    Interfaces
    , which are members that go to the same destination, by selecting one or more Layer 3 Ethernet interfaces (for DIA) or one more virtual VPN tunnel interfaces (for hub). If you enter more than one interface, they must all be the same type (either VPN tunnel or DIA).
    The firewall virtual router uses this virtual SD-WAN interface to route SD-WAN traffic to a DIA or a hub location. During routing, the route table determines which virtual SD-WAN interface (egress interface) the packet will exit based on the destination IP address in the packet. Then the SD-WAN path health and Traffic Distribution profiles in the SD-WAN policy rule that the packet matches determine which path to use (and the order in which to consider new paths if a path deteriorates.)
  7. Click
    OK
    to save your configuration change.
  8. Commit
    and
    Commit and Push
    your configuration changes.

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