This is to validate the DHCP relay functionality on a DUT. The test validates the following actions -

• DUT receives the IPv4/IPv6 DHCP discovery message over an individual or a LAG port and it will forward the request to the DHCP helper address.
• DUT forwards DHCP exchange messages between the DHCP Client and DHCP server.
• The DHCP client receives a DHCP address.

• featureprofiles/topologies/atedut_4.testbed

graph LR; 
A[ATE:Port1] --(Vlan 10)-->B[Port1:DUT:Port3];B --Egress-->C[Port3:ATE];

                                                    ---------
                                                    |       |
    [ ATE:Port1, ATE:Port2 ] ==== LAG  (VLAN 10)=== |  DUT  |----Egress---[ ATE:Port3 ]
                                                    |       |
                                                    |       |
                                                    ---------

• Connect ports DUT:Ports[1-3] to ports ATE:Ports[1-3]
• Simulate a scenario of having a DHCP server is behind ATE:Port[3]
• DUT:Port[3] IPv4 address = 192.0.2.0/31
• DUT:Port[3] IPv6 address = 2001:db8:a::0/127

• Configure VLAN 10 on DUT.
  • Have DUT:Port[1] and DUT:Port[2] be a part of vlan 10
  • VLAN10 interface IPv4 address: 192.0.2.33/27
  • VLAN10 interface IPv6 address: 2001:db8:a:1::1/64
  • Configure IPv4 and IPv6 helper address under VLAN10 interface.
    • IPv4 helper address - 192.0.2.254
    • IPv6 dhcp relay destination address : 2001:db8:a:2::1
• Configure IPv4 default route on the DUT pointing to ATE:Port[3] IPv4 address.
• Configure IPv6 default route on the DUT pointing to ATE:Port[3] IPv6 address.

• Step 1 - Have ATE:Port[1] as an individual port and act as a DHCP client.
• Step 2 - Send IPv4 and IPv6 DHCP request (Discover message) from ATE:Port[1].

Verify that:

• The DUT:Port[1] receives the DHCP request and forwards it to the helper IPv4 and IPv6 addresses respectively.
• The ATE:Port[1] can successfully obtain an IPv4 address that is a part of the subnet 192.0.2.32/27 with the default gateway set to 192.0.2.33.
• The ATE:Port[1] can successfully obtain an IPv6 address that is a part of the subnet 2001:db8:a:1::/64 with the default gateway set to 2001:db8:a:1::1.

• Step 1 - DUT:Port[1] and DUT:Port[2] are configured as a LACP LAG (LAG1) port to ATE:Port[1] and ATE:Port[2] respectively.
• Step 2 - Send IPv4 and IPv6 DHCP request (Discover message) from ATE:Port[1].

Verify that:

• The DUT:Port[1] receives the DHCP request and forwards it to the helper IPv4 and IPv6 addresses respectively.
• The ATE:Port[1] can successfully obtain an IPv4 address that is a part of the subnet 192.0.2.32/27 with the default gateway set to 192.0.2.33.
• The ATE:Port[1] can successfully obtain an IPv6 address that is a part of the subnet 2001:db8:a:1::/64 with the default gateway set to 2001:db8:a:1::1.

{
  "openconfig-relay-agent:relay-agent": {
    "dhcp": {
      "interfaces": {
        "interface": [
          {
            "id": "Vlan10",
            "config": {
              "id": "Vlan10",
              "helper-address": [
                "192.0.2.254",
                "2001:db8:a:2::1"
              ]
            },
            "state": {
              "id": "Vlan10"
            }
          }
        ]
      }
    }
  }
}

paths:

## Config Paths ##

/relay-agent/dhcp/interfaces/interface[id=Vlan10]/config/id:
/relay-agent/dhcp/interfaces/interface[id=Vlan10]/ipv4/config/helper-address:
/relay-agent/dhcp/interfaces/interface[id=Vlan10]/ipv6/config/helper-address:

## State Paths ##


/relay-agent/dhcp/interfaces/interface/ipv4/state/helper-address:
/relay-agent/dhcp/interfaces/interface/ipv6/state/helper-address:

rpcs:
  gnmi:
    gNMI.Set:
      union_replace: true
      replace: true
    gNMI.Subscribe:
      on_change: true

• Specify the minimum DUT-type:
  • FFF - Fixed Form Factor