[ONOS-6707] Host Protobuf model

Change-Id: Id036c13a92ac629465eddfc7c695c55086c3d5c0
diff --git a/incubator/protobuf/models/src/main/proto/net/HostIdProto.proto b/incubator/protobuf/models/src/main/proto/net/HostIdProto.proto
new file mode 100644
index 0000000..32830e9
--- /dev/null
+++ b/incubator/protobuf/models/src/main/proto/net/HostIdProto.proto
@@ -0,0 +1,10 @@
+syntax = "proto3";
+option java_package = "org.onosproject.grpc.net.models";
+
+package net;
+
+// Corresponds to org.onosproject.net.HostId.
+message HostIdProto {
+    string mac = 1;
+    uint32 vlan_id = 2;
+}
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