diff --git a/openfpga/src/repack/lb_router.cpp b/openfpga/src/repack/lb_router.cpp
index 277548e18..c1b67b804 100644
--- a/openfpga/src/repack/lb_router.cpp
+++ b/openfpga/src/repack/lb_router.cpp
@@ -39,6 +39,15 @@ LbRouter::LbRouter(const LbRRGraph& lb_rr_graph, t_logical_block_type_ptr lb_typ
 /**************************************************
  * Public Accessors 
  *************************************************/
+LbRouter::net_range LbRouter::nets() const {
+  return vtr::make_range(lb_net_ids_.begin(), lb_net_ids_.end());
+}
+
+AtomNetId LbRouter::net_atom_net_id(const NetId& net) const {
+  VTR_ASSERT(true == valid_net_id(net));
+  return lb_net_atom_net_ids_[net]; 
+}
+
 std::vector<LbRRNodeId> LbRouter::find_congested_rr_nodes(const LbRRGraph& lb_rr_graph) const {
   /* Validate if the rr_graph is the one we used to initialize the router */
   VTR_ASSERT(true == matched_lb_rr_graph(lb_rr_graph));
diff --git a/openfpga/src/repack/lb_router.h b/openfpga/src/repack/lb_router.h
index bf96a5958..c1d82ca1c 100644
--- a/openfpga/src/repack/lb_router.h
+++ b/openfpga/src/repack/lb_router.h
@@ -29,6 +29,9 @@ class LbRouter {
   public: /* Strong ids */
     struct net_id_tag;
     typedef vtr::StrongId<net_id_tag> NetId;
+  public: /* Types and ranges */
+    typedef vtr::vector<NetId, NetId>::const_iterator net_iterator;
+    typedef vtr::Range<net_iterator> net_range;
   public: /* Intra-Logic Block Routing Data Structures (by instance) */
     /**************************************************************************
      * Describes the status of a logic cluster_ctx.blocks routing resource node 
@@ -163,6 +166,12 @@ class LbRouter {
     LbRouter(const LbRRGraph& lb_rr_graph, t_logical_block_type_ptr lb_type);
   
   public :  /* Public accessors */
+    /* Return the ids for all the nets to be routed */ 
+    net_range nets() const;
+
+    /* Return the atom net id for a net to be routed */
+    AtomNetId net_atom_net_id(const NetId& net) const;    
+
     /**
      * Find all the routing resource nodes that are over-used, which they are used more than their capacity
      * This function is call to collect the nodes and router can reroute these net
diff --git a/openfpga/src/repack/lb_router_utils.cpp b/openfpga/src/repack/lb_router_utils.cpp
index 221f5a640..c106cd9f7 100644
--- a/openfpga/src/repack/lb_router_utils.cpp
+++ b/openfpga/src/repack/lb_router_utils.cpp
@@ -66,4 +66,34 @@ LbRouter::NetId add_lb_router_net_to_route(LbRouter& lb_router,
   return lb_net;
 }
 
+/***************************************************************************************
+ * Load the routing results (routing tree) from lb router to 
+ * a physical pb data structure
+ ***************************************************************************************/
+void save_lb_router_results_to_physical_pb(PhysicalPb& phy_pb,
+                                           const LbRouter& lb_router,
+                                           const LbRRGraph& lb_rr_graph) {
+  /* Get mapping routing nodes per net */
+  for (const LbRouter::NetId& net : lb_router.nets()) {
+    std::vector<LbRRNodeId> routed_nodes = lb_router.net_routed_nodes(net);
+    for (const LbRRNodeId& node : routed_nodes) {
+      t_pb_graph_pin* pb_graph_pin = lb_rr_graph.node_pb_graph_pin(node);
+      if (nullptr == pb_graph_pin) {
+        continue;
+      }
+      /* Find the pb id */
+      const PhysicalPbId& pb_id = phy_pb.find_pb(pb_graph_pin->parent_node);
+      VTR_ASSERT(true == phy_pb.valid_pb_id(pb_id));
+
+      const AtomNetId& atom_net = lb_router.net_atom_net_id(net);
+      
+      if (AtomNetId::INVALID() == phy_pb.pb_graph_pin_atom_net(pb_id, pb_graph_pin)) {
+        phy_pb.set_pb_graph_pin_atom_net(pb_id, pb_graph_pin, atom_net);
+      } else {
+        VTR_ASSERT(atom_net == phy_pb.pb_graph_pin_atom_net(pb_id, pb_graph_pin));
+      }
+    }
+  }
+}
+
 } /* end namespace openfpga */
diff --git a/openfpga/src/repack/lb_router_utils.h b/openfpga/src/repack/lb_router_utils.h
index 6a92201eb..129796e7d 100644
--- a/openfpga/src/repack/lb_router_utils.h
+++ b/openfpga/src/repack/lb_router_utils.h
@@ -7,6 +7,7 @@
 #include "atom_netlist.h"
 #include "lb_rr_graph.h"
 #include "lb_router.h"
+#include "physical_pb.h"
 
 /********************************************************************
  * Function declaration
@@ -22,6 +23,10 @@ LbRouter::NetId add_lb_router_net_to_route(LbRouter& lb_router,
                                            const AtomContext& atom_ctx,
                                            const AtomNetId& atom_net_id);
 
+void save_lb_router_results_to_physical_pb(PhysicalPb& phy_pb,
+                                           const LbRouter& lb_router,
+                                           const LbRRGraph& lb_rr_graph);
+
 } /* end namespace openfpga */
 
 #endif
diff --git a/openfpga/src/repack/repack.cpp b/openfpga/src/repack/repack.cpp
index e4df2986d..371d4ab46 100644
--- a/openfpga/src/repack/repack.cpp
+++ b/openfpga/src/repack/repack.cpp
@@ -293,6 +293,7 @@ void repack_cluster(const AtomContext& atom_ctx,
                                            atom_ctx,
                                            device_annotation);
   /* TODO: save routing results */
+  save_lb_router_results_to_physical_pb(phy_pb, lb_router, lb_rr_graph);
   VTR_LOGV(verbose, "Saved results in physical pb\n");
 
   /* Add the pb to clustering context */