Added the ability to independently configure switch vlan. This will people to leave the switch in trunk mode and set a vlan for the vm.

builder/hyperv/common/step_configure_vlan.go

@@ -6,12 +6,14 @@ package common
 
 import (
 	"fmt"
+
 	"github.com/mitchellh/multistep"
 	"github.com/mitchellh/packer/packer"
 )
 
 type StepConfigureVlan struct {
-	VlanID string
+	VlanId       string
+	SwitchVlanId string
 }
 
 func (s *StepConfigureVlan) Run(state multistep.StateBag) multistep.StepAction {
@@ -21,30 +23,29 @@ func (s *StepConfigureVlan) Run(state multistep.StateBag) multistep.StepAction {
 	errorMsg := "Error configuring vlan: %s"
 	vmName := state.Get("vmName").(string)
 	switchName := state.Get("SwitchName").(string)
+	vlanId := s.VlanId
+	switchVlanId := s.SwitchVlanId
 
 	ui.Say("Configuring vlan...")
 
-	vlanId := s.VlanID
-
-	if vlanId == "" {
-		// If no vlan ID is specified, do not enable Virtual LAN Identification
-		return multistep.ActionContinue
+	if switchVlanId != "" {
+		err := driver.SetNetworkAdapterVlanId(switchName, vlanId)
+		if err != nil {
+			err := fmt.Errorf(errorMsg, err)
+			state.Put("error", err)
+			ui.Error(err.Error())
+			return multistep.ActionHalt
+		}
 	}
 
-	err := driver.SetNetworkAdapterVlanId(switchName, vlanId)
-	if err != nil {
-		err := fmt.Errorf(errorMsg, err)
-		state.Put("error", err)
-		ui.Error(err.Error())
-		return multistep.ActionHalt
-	}
-
-	err = driver.SetVirtualMachineVlanId(vmName, vlanId)
-	if err != nil {
-		err := fmt.Errorf(errorMsg, err)
-		state.Put("error", err)
-		ui.Error(err.Error())
-		return multistep.ActionHalt
+	if vlanId != "" {
+		err := driver.SetVirtualMachineVlanId(vmName, vlanId)
+		if err != nil {
+			err := fmt.Errorf(errorMsg, err)
+			state.Put("error", err)
+			ui.Error(err.Error())
+			return multistep.ActionHalt
+		}
 	}
 
 	return multistep.ActionContinue

builder/hyperv/iso/builder.go

@@ -87,7 +87,8 @@ type Config struct {
 
 	BootCommand                    []string `mapstructure:"boot_command"`
 	SwitchName                     string   `mapstructure:"switch_name"`
-	VlandID                        string   `mapstructure:"vlan_id"`
+	SwitchVlanId                   string   `mapstructure:"switch_vlan_id"`
+	VlanId                         string   `mapstructure:"vlan_id"`
 	Cpu                            uint     `mapstructure:"cpu"`
 	Generation                     uint     `mapstructure:"generation"`
 	EnableMacSpoofing              bool     `mapstructure:"enable_mac_spoofing"`
@@ -272,6 +273,13 @@ func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
 		}
 	}
 
+	if b.config.SwitchVlanId != "" {
+		if b.config.SwitchVlanId != b.config.VlanId {
+			warning = fmt.Sprintf("Switch network adaptor vlan should match virtual machine network adaptor vlan. The switch will not be able to see traffic from the VM.")
+			warnings = appendWarnings(warnings, warning)
+		}
+	}
+
 	if errs != nil && len(errs.Errors) > 0 {
 		return warnings, errs
 	}
@@ -356,7 +364,8 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 		},
 
 		&hypervcommon.StepConfigureVlan{
-			VlanID: b.config.VlandID,
+			VlanId:       b.config.VlanId,
+			SwitchVlanId: b.config.SwitchVlanId,
 		},
 
 		&hypervcommon.StepRun{

website/source/docs/builders/hyperv-iso.html.markdown

@@ -186,7 +186,15 @@ can be configured for this builder.
 	this to an empty string, Packer will try to determine the switch to use by looking for
 	external switch that is up and running.
 
--   `vm_name` (string) - This is the name of the virtua machine for the new virtual
+-   `switch_vlan_id` (string) - This is the vlan of the virtual switch's network card. 
+	By default none is set. If none is set then a vlan is not set on the switch's network card.
+	If this value is set it should match the vlan specified in by `vlan_id`.
+
+-   `vlan_id` (string) - This is the vlan of the virtual machine's network card for the new virtual
+	machine. By default none is set. If none is set then vlans are not set on the virtual machine's 
+	network card.
+
+-   `vm_name` (string) - This is the name of the virtual machine for the new virtual
 	machine, without the file extension. By default this is "packer-BUILDNAME",
 	where "BUILDNAME" is the name of the build.