neighbor advertisement must with target_link option

Change-Id: Ic20eea8f2fd19dd3c1728a1f7c622ef0c9728f81
Signed-off-by: ahdj007 <dong.juan1@zte.com.cn>
diff --git a/src/vnet/ip/ip6_neighbor.c b/src/vnet/ip/ip6_neighbor.c
old mode 100644
new mode 100755
index c506ad7..1093009
--- a/src/vnet/ip/ip6_neighbor.c
+++ b/src/vnet/ip/ip6_neighbor.c
@@ -5050,6 +5050,8 @@
       h->neighbor.target_address = ip6_addr[0];
       h->neighbor.advertisement_flags = clib_host_to_net_u32
 	(ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
+      h->link_layer_option.header.type =
+	ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
       clib_memcpy (h->link_layer_option.ethernet_address,
 		   hi->hw_address, vec_len (hi->hw_address));
       h->neighbor.icmp.checksum =