Index: trunk/src/plugins/rt_topo/crbs_cdt.c
===================================================================
--- trunk/src/plugins/rt_topo/crbs_cdt.c	(revision 1335)
+++ trunk/src/plugins/rt_topo/crbs_cdt.c	(revision 1336)
@@ -102,3 +102,60 @@
 		}
 	VTPOINT_FOREACH_END();
 }
+
+static edge_t *crbs_cdt_get_edge(point_t *pt1, point_t *pt2)
+{
+	EDGELIST_FOREACH(e, (pt1->adj_edges)) {
+		if ((e->endp[0] == pt2) || (e->endp[1] == pt2))
+			return e;
+	}
+	EDGELIST_FOREACH_END();
+
+	return NULL;
+}
+
+void rt_topo_crbs_cdt_inc_edge(crbs_t *crbs, grbs_addr_t *a1, grbs_addr_t *a2)
+{
+	crbs_point_t *pt1, *pt2;
+	edge_t *cdt_e;
+	crbs_edge_t *edge;
+
+	if ((a1->type & 0x0F) == ADDR_POINT)
+		pt1 = a1->obj.pt->user_data;
+	else
+		pt1 = a1->obj.arc->parent_pt->user_data;
+
+	if ((a2->type & 0x0F) == ADDR_POINT)
+		pt2 = a2->obj.pt->user_data;
+	else
+		pt2 = a2->obj.arc->parent_pt->user_data;
+
+	cdt_e = crbs_cdt_get_edge(pt1->cpt, pt2->cpt);
+
+	assert(cdt_e != NULL);
+	edge = cdt_e->data;
+	edge->nets++;
+	assert(edge->nets > 0); /* unlikely: overflow */
+}
+
+void rt_topo_crbs_cdt_dec_edge(crbs_t *crbs, grbs_arc_t *arc1, grbs_arc_t *arc2)
+{
+	crbs_point_t *pt1 = arc1->parent_pt->user_data, *pt2 = arc1->parent_pt->user_data;
+	edge_t *cdt_e = crbs_cdt_get_edge(pt1->cpt, pt2->cpt);
+	crbs_edge_t *edge;
+
+	assert(cdt_e != NULL);
+	edge = cdt_e->data;
+	assert(edge->nets > 0);
+	edge->nets--;
+}
+
+
+void rt_topo_crbs_cdt_unref_tn(crbs_t *crbs, grbs_2net_t *tn)
+{
+	grbs_arc_t *prev = NULL, *a;
+	for(a = gdl_first(&tn->arcs); a != NULL; prev = a, a = gdl_next(&tn->arcs, a)) {
+		if (prev != NULL)
+			rt_topo_crbs_cdt_dec_edge(crbs, prev, a);
+	}
+}
Index: trunk/src/plugins/rt_topo/crbs_route.c
===================================================================
--- trunk/src/plugins/rt_topo/crbs_route.c	(revision 1335)
+++ trunk/src/plugins/rt_topo/crbs_route.c	(revision 1336)
@@ -439,6 +439,8 @@
 		if (grbs_path_validate(&crbs->grbs, crbs->routing_tn, pa, na, na->user_data) != 0) {
 			abort();
 		}
+		if (pa != NULL)
+			rt_topo_crbs_cdt_inc_edge(crbs, pa, na);
 	}
 
 	for(na = firsta; na != NULL; na = na->user_data)
@@ -489,6 +491,7 @@
 
 	/* remove the offending 2net */
 	best->ripped_up++;
+	rt_topo_crbs_cdt_unref_tn(crbs, best->gtn);
 	grbs_path_remove_2net(&crbs->grbs, best->gtn);
 	best->gtn = NULL;