Adding OpenConfig YANG models.

Change-Id: I0a2fdd5826e80933cf4b9ae939ff3051acec02aa
diff --git a/models/openconfig/src/main/yang/mpls/openconfig-mpls-igp.yang b/models/openconfig/src/main/yang/mpls/openconfig-mpls-igp.yang
new file mode 100644
index 0000000..309be68
--- /dev/null
+++ b/models/openconfig/src/main/yang/mpls/openconfig-mpls-igp.yang
@@ -0,0 +1,98 @@
+submodule openconfig-mpls-igp {
+
+  yang-version "1";
+
+  belongs-to "openconfig-mpls" {
+    prefix "oc-mpls";
+  }
+
+
+  // import some basic types
+  import openconfig-mpls-ldp { prefix oc-ldp; }
+  import openconfig-extensions { prefix oc-ext; }
+
+
+
+  // meta
+  organization "OpenConfig working group";
+
+  contact
+    "OpenConfig working group
+    netopenconfig@googlegroups.com";
+
+  description
+    "Configuration generic configuration parameters for IGP-congruent
+    LSPs";
+
+  oc-ext:openconfig-version "2.4.0";
+
+  revision "2017-06-21" {
+    description
+      "Add TC bits typedef.";
+    reference "2.4.0";
+  }
+
+  revision "2017-03-22" {
+    description
+      "Add RSVP calculated-absolute-subscription-bw";
+    reference "2.3.0";
+  }
+
+  revision "2017-01-26" {
+    description
+      "Add RSVP Tspec, clarify units for RSVP, remove unused LDP";
+    reference "2.2.0";
+  }
+
+  revision "2016-12-15" {
+    description
+      "Add additional MPLS parameters";
+    reference "2.1.0";
+  }
+
+  revision "2016-09-01" {
+    description
+      "Revisions based on implementation feedback";
+    reference "2.0.0";
+  }
+
+  revision "2016-08-08" {
+    description
+      "Public release of MPLS models";
+    reference "1.0.1";
+  }
+
+  // grouping statements
+
+
+  grouping igp-lsp-common {
+    description
+      "common definitions for IGP-congruent LSPs";
+
+  }
+
+
+  grouping igp-lsp-setup {
+    description
+      "signaling protocol definitions for IGP-based LSPs";
+
+    container path-setup-protocol {
+      description
+        "select and configure the signaling method for
+          the LSP";
+
+      // uses path-setup-common;
+      uses oc-ldp:igp-lsp-ldp-setup;
+    }
+  }
+
+
+  // data definition statements
+
+  // augment statements
+
+  // rpc statements
+
+  // notification statements
+
+}