diff -urNp grub-2.02-rc1.orig/grub-core/kern/ieee1275/init.c grub-2.02-rc1/grub-core/kern/ieee1275/init.c
--- grub-2.02-rc1.orig/grub-core/kern/ieee1275/init.c	2017-02-08 15:06:05.420317447 +0000
+++ grub-2.02-rc1/grub-core/kern/ieee1275/init.c	2017-02-08 15:06:17.784317308 +0000
@@ -125,6 +125,7 @@ grub_machine_get_bootlocation (char **de
       char *dev, *canon;
       char *ptr;
       dev = grub_ieee1275_get_aliasdevname (bootpath);
+      grub_ieee1275_parse_net_options (bootpath);
       canon = grub_ieee1275_canonicalise_devname (dev);
       ptr = canon + grub_strlen (canon) - 1;
       while (ptr > canon && (*ptr == ',' || *ptr == ':'))
diff -urNp grub-2.02-rc1.orig/grub-core/kern/ieee1275/openfw.c grub-2.02-rc1/grub-core/kern/ieee1275/openfw.c
--- grub-2.02-rc1.orig/grub-core/kern/ieee1275/openfw.c	2017-02-08 15:06:05.420317447 +0000
+++ grub-2.02-rc1/grub-core/kern/ieee1275/openfw.c	2017-02-08 15:06:17.785317308 +0000
@@ -23,6 +23,7 @@
 #include <grub/mm.h>
 #include <grub/ieee1275/ieee1275.h>
 #include <grub/net.h>
+#include <grub/env.h>
 
 enum grub_ieee1275_parse_type
 {
@@ -451,6 +452,35 @@ fail:
   return ret;
 }
 
+int
+grub_ieee1275_parse_net_options (const char *path)
+{
+  char *comma;
+  char *args;
+  char *option = 0;
+
+  args = grub_ieee1275_get_devargs (path);
+  if (!args)
+    /* There is no option.  */
+    return -1;
+
+  do
+    {
+      comma = grub_strchr (args, ',');
+      if (! comma)
+        option = grub_strdup (args);
+      else
+        option = grub_strndup (args, (grub_size_t)(comma - args));
+      args = comma + 1;
+
+      if (! grub_strncmp(option, "vtag", 4))
+          grub_env_set ("vlan-tag", option + grub_strlen("vtag="));
+
+    } while (comma);
+
+  return 0;
+}
+
 char *
 grub_ieee1275_get_device_type (const char *path)
 {
diff -urNp grub-2.02-rc1.orig/grub-core/net/ethernet.c grub-2.02-rc1/grub-core/net/ethernet.c
--- grub-2.02-rc1.orig/grub-core/net/ethernet.c	2017-02-08 15:06:05.433317447 +0000
+++ grub-2.02-rc1/grub-core/net/ethernet.c	2017-02-08 15:06:17.785317308 +0000
@@ -23,6 +23,7 @@
 #include <grub/net/arp.h>
 #include <grub/net/netbuff.h>
 #include <grub/net.h>
+#include <grub/env.h>
 #include <grub/time.h>
 #include <grub/net/arp.h>
 
@@ -56,10 +57,19 @@ send_ethernet_packet (struct grub_net_ne
 {
   struct etherhdr *eth;
   grub_err_t err;
+  grub_uint32_t vlantag = 0;
+  grub_uint8_t etherhdr_size;
 
-  COMPILE_TIME_ASSERT (sizeof (*eth) < GRUB_NET_MAX_LINK_HEADER_SIZE);
+  etherhdr_size = sizeof (*eth);
+  COMPILE_TIME_ASSERT (sizeof (*eth) + 4 < GRUB_NET_MAX_LINK_HEADER_SIZE);
 
-  err = grub_netbuff_push (nb, sizeof (*eth));
+  const char *vlantag_text = grub_env_get ("vlan-tag");
+  if (vlantag_text != 0) {
+      etherhdr_size += 4;
+      vlantag = grub_strtoul (vlantag_text, 0, 16);
+  }
+
+  err = grub_netbuff_push (nb, etherhdr_size);
   if (err)
     return err;
   eth = (struct etherhdr *) nb->data;
@@ -76,6 +86,19 @@ send_ethernet_packet (struct grub_net_ne
 	return err;
       inf->card->opened = 1;
     }
+
+  /* Check if a vlan-tag is needed. */
+  if (vlantag != 0)
+    {
+      /* Move eth type to the right */
+      grub_memcpy((char *) nb->data + etherhdr_size - 2,
+                  (char *) nb->data + etherhdr_size - 6, 2);
+
+      /* Add the tag in the middle */
+      grub_memcpy((char *) nb->data + etherhdr_size - 6,
+                  &vlantag, 4);
+    }
+
   return inf->card->driver->send (inf->card, nb);
 }
 
@@ -90,10 +113,23 @@ grub_net_recv_ethernet_packet (struct gr
   grub_net_link_level_address_t hwaddress;
   grub_net_link_level_address_t src_hwaddress;
   grub_err_t err;
+  grub_uint8_t etherhdr_size = sizeof (*eth);
+
+  grub_uint16_t vlantag_identifier = 0;
+  grub_memcpy (&vlantag_identifier, nb->data + etherhdr_size - 2, 2);
+
+  /* Check if a vlan-tag is present. */
+  if (vlantag_identifier == VLANTAG_IDENTIFIER)
+    {
+      etherhdr_size += 4;
+      /* Move eth type to the original position */
+      grub_memcpy((char *) nb->data + etherhdr_size - 6,
+                  (char *) nb->data + etherhdr_size - 2, 2);
+    }
 
   eth = (struct etherhdr *) nb->data;
   type = grub_be_to_cpu16 (eth->type);
-  err = grub_netbuff_pull (nb, sizeof (*eth));
+  err = grub_netbuff_pull (nb, etherhdr_size);
   if (err)
     return err;
 
diff -urNp grub-2.02-rc1.orig/include/grub/ieee1275/ieee1275.h grub-2.02-rc1/include/grub/ieee1275/ieee1275.h
--- grub-2.02-rc1.orig/include/grub/ieee1275/ieee1275.h	2017-02-08 15:06:05.445317447 +0000
+++ grub-2.02-rc1/include/grub/ieee1275/ieee1275.h	2017-02-08 15:06:17.787317308 +0000
@@ -227,6 +227,7 @@ char *EXPORT_FUNC(grub_ieee1275_get_alia
 char *EXPORT_FUNC(grub_ieee1275_canonicalise_devname) (const char *path);
 char *EXPORT_FUNC(grub_ieee1275_get_device_type) (const char *path);
 char *EXPORT_FUNC(grub_ieee1275_get_devname) (const char *path);
+int EXPORT_FUNC(grub_ieee1275_parse_net_options) (const char *path);
 
 void EXPORT_FUNC(grub_ieee1275_devalias_init_iterator) (struct grub_ieee1275_devalias *alias);
 void EXPORT_FUNC(grub_ieee1275_devalias_free) (struct grub_ieee1275_devalias *alias);
diff -urNp grub-2.02-rc1.orig/include/grub/net.h grub-2.02-rc1/include/grub/net.h
--- grub-2.02-rc1.orig/include/grub/net.h	2017-02-08 15:06:05.446317447 +0000
+++ grub-2.02-rc1/include/grub/net.h	2017-02-08 15:06:17.788317308 +0000
@@ -561,4 +561,6 @@ extern char *grub_net_default_server;
 #define GRUB_NET_INTERVAL 400
 #define GRUB_NET_INTERVAL_ADDITION 20
 
+#define VLANTAG_IDENTIFIER 0x8100
+
 #endif /* ! GRUB_NET_HEADER */