Alternative approach for dhcp support by introducing chained ethernet.

https://redocly.github.io/redoc/?url=https://raw.githubusercontent.com/open-traffic-generator/models/dhcp_support2/artifacts/openapi.yaml&nocors#tag/Configuration/operation/set_config

This is model designed to take care of implementation: 1) DHCP Client & Server are Keysight and Relay Agent as DUT: In this the construct dhcp_v4interface and dhcp_v4interface are exposed under an Ethernet Interface to configure DHCP Client parameters. 2) DHCP Client Behind the Relay Agent and are Keysight and DHCP Server as Keysight/DUT: In this case DHCP client sits beside the Relay Agent that runs on top of connection Interfaces. Hence new a construct introduced, Chained Ethernets which parallel to connected Ethernets under the Device. This chained Ethernet can be linked to another chained Ethernet or a connected Ethernet interface. dhcp_v4interface and dhcp_v4interface are exposed under a Chained Ethernet interface to configure DHCP Client parameters. 3) BGP peer can be configured on top of DHCP interface: BGP peer is to refer ipv4_name or ipv6_name for IPv4/IPv6 connected or loopback interfaces. Now BGP peer can also refer to dhcp_v4interface or dhcp_v6interface interfaces. 4) For the Traffic use case, we have auto learning of the destination learning. Now the model is extended to auto learning of source IP address by exposing AutoDhcp() . Also TXRx name can be referred to dhcp_v4interface/dhcp_v6interface.

exampls-alternative

`
// Case-1: DHCP Client & Server are Keysight and Relay Agent as DUT. // DHCPV4-Client(x.x.x.x)<-------> (1.1.1.1)RelayAgent(DUT)(2.2.2.1) <------>(2.2.2.2) DHCPV4-Server(Pool: 100.1.1.1) // DHCP Client is configured on connected interface.

    config := gosnappi.NewConfig()
    // add ports
    p1 := config.Ports().Add().SetName("p1").SetLocation(opts.IxiaCPorts()[0])
    p2 := config.Ports().Add().SetName("p2").SetLocation(opts.IxiaCPorts()[1])

    // add devices
    d1 := config.Devices().Add().SetName("p1d1")
    d2 := config.Devices().Add().SetName("p2d1")

    // add protocol stacks for device d1
    d1Eth1 := d1.Ethernets().
        Add().
        SetName("p1d1eth").
        SetMac("00:00:01:01:01:01").
        SetMtu(1500)
    d1Eth1.Connection().SetPortName(p1.Name())

    p1d1DhcpV4Client := d1Eth1.
        DhcpV4interface().
        SetName("p1d1dhcpv4").
        SetEthName(d1Eth1.Name())

    // add protocol stacks for device d2
    d2Eth1 := d2.Ethernets().
        Add().
        SetName("p2d1eth").
        SetMac("00:00:02:02:02:02").
        SetMtu(1500)
    d2Eth1.Connection().SetPortName(p2.Name())

    d2p2Ipv4 := d2Eth1.
        Ipv4Addresses().
        Add().
        SetName("p2d1ipv4").
        SetAddress("2.2.2.2").
        SetGateway("2.2.2.1").
        SetPrefix(32)

    d2p2DhcpServerv4Iface1 := d2.DhcpServer().V4Server().
        Ipv4Interfaces().Add().
        SetIpv4Name("p2d1ipv4") //

    p2d2DhcpV4Server := d2Dhcpv4Iface1.
        v4().
        SetName("p2d2DhcpV4Server")

    p2d2DhcpV4Server.SetLeaseTime(1000).
        SetPoolSize(100).
        SetStartPoolAddress("100.1.1.1").
        SetPrefix(24).
        SetStep(1)

    // add endpoints and packet description flow 1
    f1 := config.Flows().Items()[0]
    f1.SetName(p1.Name() + " -> " + p2.Name()).
        TxRx().Device().
        SetTxNames([]string{p1d1DhcpV4Client.Name()}).
        SetRxNames([]string{d2p2DhcpServerv4Iface1.Ipv4Name()})

    f1Eth := f1.Packet().Add().Ethernet()
    f1Eth.Src().SetValue(d1Eth1.Mac())
    f1Eth.Dst().Auto()

    f1Ip := f1.Packet().Add().Ipv4()
    f1Ip.Src().AutoDhcp()
    f1Ip.Dst().SetValue("2.2.2.2")

    // add endpoints and packet description flow 2
    f2 := config.Flows().Items()[1]
    f2.SetName(p2.Name() + " -> " + p1.Name()).
        TxRx().Device().
        SetTxNames([]string{p2d2DhcpV4Server.Name()}).
        SetRxNames([]string{p1d1DhcpV4Client.ConnEthName()})

    f2Eth := f2.Packet().Add().Ethernet()
    f2Eth.Src().SetValue(d2Eth1.Mac())
    f2Eth.Dst().Auto()

    f2Ip := f2.Packet().Add().Ipv4()
    f2Ip.Src().SetValue("2.2.2.2")
    f2Ip.Dst().AutoDhcp()

// Case-2: DHCP Client Behind the Relay Agent and are Keysight and DHCP Server as Keysight/DUT. // DHCPV4-Client(x.x.x.x)<------->(100.1.1.1)RelayAgent(DUT)(2.2.2.1) <------>(2.2.2.2) DHCPV4-Server(Pool: 100.1.1.1) // DHCP Client is configured on unconnected connected interface.

    config := gosnappi.NewConfig()

    // add ports
    p1 := config.Ports().Add().SetName("p1").SetLocation(opts.IxiaCPorts()[0])
    p2 := config.Ports().Add().SetName("p2").SetLocation(opts.IxiaCPorts()[1])

    // add devices
    d1 := config.Devices().Add().SetName("p1d1")
    d1_chained := config.Devices().Add().SetName("p1d1_chained")

    d2 := config.Devices().Add().SetName("p2d1")

    // add protocol stacks for device d1 where Relay Agent will be configureds
    d1Eth1 := d1.Ethernets().
        Add().
        SetName("p1d1eth").
        SetMac("00:00:01:01:01:01").
        SetMtu(1500)
    d1Eth1.Connection().SetPortName(p1.Name())

// Configure a IPv4 stack
    d1p1Ipv4 := d1Eth1.
        Ipv4Addresses().
        Add().
        SetName("p1d1ipv4").
        SetAddress("2.2.2.1").
        SetGateway("2.2.2.2").
        SetPrefix(24)

    // Configure a (place holder) Relay Agent
    d1p1RelayAgent := d2.RelayAgent()
      IpV4interfaces().Add().V4RAInst().
        SetName("d1p1RelayAgent1").
        SetIpv4Name(d1p1Ipv4.Name()).
        SetCliendSideAddress("100.1.1.1")
        SetDhcpServer("2.2.2.2")

    // Chained Ethernet where DHCPClient behind the Relay Agent will be configured.
    d1ChainedEth2 := d1_chained.ChainedEthernets().
        Add().
        SetName("p1d1eth2_chained").
        SetMac("00:00:01:01:01:01").
        SetChainedEthernetName
    d1ChainedEth2.Connection().ChainedEthernetName(d1Eth1.Name())

    p1d1DhcpV4Client := d1ChainedEth2.
        dhcp_v4interface().
        SetName("p1d1dhcpv4").
        SetEthName(d1ChainedEth2.Name())

    // add protocol stacks for device d2
    d2Eth1 := d2.Ethernets().
        Add().
        SetName("p2d1eth").
        SetMac("00:00:02:02:02:02").
        SetMtu(1500)

    d2Eth1.Connection().SetPortName(p2.Name())

    d2p2Ipv4 := d2Eth1.
        Ipv4Addresses().
        Add().
        SetName("p2d1ipv4").
        SetAddress("2.2.2.2").
        SetGateway("2.2.2.1").
        SetPrefix(24)

    d2p2DhcpServerv4Iface1 := d2.DhcpServer().V4Server().
        Ipv4Interfaces().Add().
        SetIpv4Name("p2d1ipv4") //

    p2d2DhcpV4Server := d2Dhcpv4Iface1.
        v4().
        SetName("p2d2DhcpV4Server")

    p2d2DhcpV4Server.SetLeaseTime(1000).
        SetPoolSize(100).
        SetStartPoolAddress("100.1.1.2").
        SetPrefix(24).
        SetStep(1)

    // add endpoints and packet description flow 1
    f1 := config.Flows().Items()[0]
    f1.SetName(p1.Name() + " -> " + p2.Name()).
        TxRx().Device().
        SetTxNames([]string{p1d1DhcpV4Client.Name()}).
        SetRxNames([]string{d2p2DhcpServerv4Iface1.Ipv4Name()})

    f1Eth := f1.Packet().Add().Ethernet()
    f1Eth.Src().SetValue(d1Eth1.Mac())
    f1Eth.Dst().Auto()

    f1Ip := f1.Packet().Add().Ipv4()
    f1Ip.Src().AutoDhcp()
    f1Ip.Dst().SetValue("2.2.2.2")

    // add endpoints and packet description flow 2
    f2 := config.Flows().Items()[1]
    f2.SetName(p2.Name() + " -> " + p1.Name()).
        TxRx().Device().
        SetTxNames([]string{p2d2DhcpV4Server.Name()}).
        SetRxNames([]string{p1d1DhcpV4Client.ConnEthName()})

    f2Eth := f2.Packet().Add().Ethernet()
    f2Eth.Src().SetValue(d2Eth1.Mac())
    f2Eth.Dst().Auto()

    f2Ip := f2.Packet().Add().Ipv4()
    f2Ip.Src().SetValue("2.2.2.2")
    f2Ip.Dst().AutoDhcp()

//Case-3: BGP over DHCP Client on Port 1 & DHCP Server and BGP peer (over loopback)on Port2. config := gosnappi.NewConfig()

    // add ports
    p1 := config.Ports().Add().SetName("p1").SetLocation(opts.IxiaCPorts()[0])
    p2 := config.Ports().Add().SetName("p2").SetLocation(opts.IxiaCPorts()[1])

    // add devices
    d1 := config.Devices().Add().SetName("p1d1")
    d2 := config.Devices().Add().SetName("p2d1")
    p2Chained1 := config.Devices().Add().SetName("p2_chained1")

    // add protocol stacks for device d1
    d1Eth1 := d1.Ethernets().
        Add().
        SetName("p1d1eth").
        SetMac("00:00:01:01:01:01").
        SetMtu(1500)

    d1Eth1.Connection().SetPortName(p1.Name())

    p1d1DhcpV4Client := d1Eth1.
        dhcp_v4interface().
        SetName("p1d1dhcpv4").
        SetEthName(d1Eth1.Name())

    d1Bgp := d1.Bgp().
        SetRouterId("1.1.1.2")

    // Link with DHCP Client name
    d1BgpIpv4Interface1 := d1Bgp.
        Ipv4Interfaces().Add().
        SetIpv4Name(p1d1DhcpV4Client.Name())

    d1BgpIpv4Interface1Peer1 := d1BgpIpv4Interface1.
        Peers().
        Add().
        SetAsNumber(2222).
        SetAsType(gosnappi.BgpV4PeerAsType.EBGP).
        SetPeerAddress("22.22.22.1").
        SetName("p1d1bgpv4")

    d1BgpIpv4Interface1Peer1V4Route1 := d1BgpIpv4Interface1Peer1.
        V4Routes().
        Add().
        SetNextHopIpv4Address("1.1.1.2").
        SetName("p1d1peer1rrv4").
        SetNextHopAddressType(gosnappi.BgpV4RouteRangeNextHopAddressType.IPV4).
        SetNextHopMode(gosnappi.BgpV4RouteRangeNextHopMode.MANUAL)

    d1BgpIpv4Interface1Peer1V4Route1.Addresses().Add().
        SetAddress("100.10.10.1").
        SetPrefix(32).
        SetCount(4).
        SetStep(1)

    d1BgpIpv4Interface1Peer1V4Route1.Advanced().
        SetMultiExitDiscriminator(50).
        SetOrigin(gosnappi.BgpRouteAdvancedOrigin.EGP)

        // add protocol stacks for device d2
    d2Eth1 := d2.Ethernets().
        Add().
        SetName("p2d1eth").
        SetMac("00:00:02:02:02:02").
        SetMtu(1500)

    d2Eth1.Connection().SetPortName(p2.Name())

    d2p2Ipv4 := d2Eth1.
        Ipv4Addresses().
        Add().
        SetName("p2d1ipv4").
        SetAddress("2.2.2.2").
        SetGateway("2.2.2.1").
        SetPrefix(32)

    d2p2DhcpServerv4Iface1 := d2.DhcpServer().V4Server().
        Ipv4Interfaces().Add().
        SetIpv4Name("p2d1ipv4") //

    p2d2DhcpV4Server := d2Dhcpv4Iface1.
        v4().
        SetName("p2d2DhcpV4Server")

    p2d2DhcpV4Server.SetLeaseTime(1000).
        SetPoolSize(100).
        SetStartPoolAddress("21.21.21.1").
        SetPrefix(24).
    SetStep(1)

// Port2 first chained device.
    p2Lo1 := p2Chained1.Ipv4Loopbacks().
        Add().
        SetName("p2chaineddev1.v4lo1").
        SetAddress("22.22.22.1").
        SetEthName(d1Eth1.Name())

    p2Lo1Bgp := p2Chained1.Bgp().
        SetRouterId(p2Lo1.Address())

    p2Lo1BgpIpv4Interface1 := p2Lo1Bgp.
        Ipv4Interfaces().Add().
        SetIpv4Name("p2chaineddev1.v4lo1")

    p2Lo1BgpIpv4Interface1Peer1 := p2Lo1BgpIpv4Interface1.
        Peers().
        Add().
        SetAsNumber(1111).
        SetAsType(gosnappi.BgpV4PeerAsType.IBGP).
        SetPeerAddress("21.21.21.1").
        SetName("p2lo1bgpv4")

    p2Lo1BgpIpv4Interface1Peer1V4Route1 := p2Lo1BgpIpv4Interface1Peer1.
        V4Routes().
        Add().
        SetName("p2lo1peer1rrv4")

    p2Lo1BgpRrAddr := p2Lo1BgpIpv4Interface1Peer1V4Route1.Addresses().Add().
        SetAddress("200.1.1.1").
        SetPrefix(32)

    p2Lo1BgpIpv4Interface1Peer1V4Route1.Advanced().
        SetMultiExitDiscriminator(50).
        SetOrigin(gosnappi.BgpRouteAdvancedOrigin.EGP)

open-traffic-generator / models

Alternative approach for dhcp support by introducing chained ethernet. #360