Prisma SD-WAN Administrator’s Guide
    : Configure a DHCP Relay
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    7. Configure a DHCP Relay
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    Prisma SD-WAN Administrator’s Guide

    Configure a DHCP Relay

    Table of Contents

    Configure a DHCP Relay

    Let us learn to configure a DHCP relay.
    DHCP Relay is a branch-site feature that is configured at the interface level on a device. Typically, a DHCP Relay agent is used to forward DHCP requests between clients and servers that are not on the same physical subnet. DHCP Relay can be configured on a controller port, a LAN port, or on a sub-interface that has a defined, static IP address.
    DHCP Relay is enabled for VRF.
    When a ION device receives a DHCP request from a client on the interface configured with DHCP Relay, it forwards those requests to configured DHCP servers. It also listens to DHCP responses from all DHCP servers and relays them to the client. The DHCP Relay requests are forwarded only when the ION device is assigned to a site and the site is in active mode.
    An ION device with DHCP Relay:
    • Forwards DHCP client broadcast requests to the configured DHCP server.
    • Forwards DHCP unicast request from another DHCP Relay agent downstream on the LAN-side to the configured DHCP server.
    • Forwards DHCP client/DHCP Relay agent broadcast/unicast requests to another DHCP Relay agent.
    In the event of a DHCP server error, the ION device forwards all rejections back to the client. In the event of a client rejection, the ION device forwards all rejections from the client back to the DHCP server.
    1. Select
      Workflows
      Devices
      Claimed Devices
      , select the device you want to configure.
    2. Select the
      Interfaces
       tab.
    3. Select a port.
    4. For
      Admin Up
      , select
      No
       or
      Yes
      .
    5. (Optional)
       Enter a
      Description
      .
    6. For
      Interface Type
      , select
      Port
      .
    7. For
      Use This Port For
       select
      LAN
      .
    8. For
      IPv4 Configuration
       select
      Static
       or
      DHCP
      .
      For
      Static
      , enter the
      IP Address/Mask
      , and
      Default Gateway
       information.
    9. For
      DHCP Relay
      , select
      Yes
       to enable it.
      1. Define DHCP server IP addresses.
        Up to 16 DHCP server IP addresses may be added.
      2. (Optional)
         Define the source interface used to send DHCP requests to the servers.
        By default, the controller port is used. Make sure that the defined source interface can reach DHCP server IP addresses and vice versa. If the DHCP server is local to the branch the source interface must be the interface from which the DHCP server is accessible.
      3. (Optional)
         Enable Option 82 and configure the
        Circuit ID
        ,
        Remote ID
        , and
        Reforwarding policy
        .
        The ION device DHCP Relay agent can include additional information by using DHCP Option 82, Circuit ID, and Remote ID, which the DHCP server uses to allocate the appropriate IP address.
    10. Save Port
      .

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