Index: trunk/src/plugins/rt_topo/crbs.c
===================================================================
--- trunk/src/plugins/rt_topo/crbs.c	(revision 1365)
+++ trunk/src/plugins/rt_topo/crbs.c	(revision 1366)
@@ -113,6 +113,20 @@
 	return res;
 }
 
+static int crbs_coll_ingore_tn_line_cb(grbs_t *grbs, grbs_2net_t *tn, grbs_line_t *l)
+{
+	crbs_2net_t *lctn = l->user_data;
+	crbs_2net_t *tctn = tn->user_data;
+
+	assert(tctn != NULL);
+
+	if (lctn == NULL)
+		return 0;
+
+	return lctn->net == tctn->net;
+}
+
+
 crbs_point_t *crbs_point_new(crbs_t *crbs)
 {
 	crbs_point_t *p = calloc(sizeof(crbs_point_t), 1);
@@ -161,6 +175,8 @@
 	crbs->grbs.coll_report_cb = crbs_coll_report_cb;
 	crbs->grbs.coll_check_arc = crbs_coll_check_arc_cb;
 	crbs->grbs.coll_check_line = crbs_coll_check_line_cb;
+	crbs->grbs.coll_ingore_tn_line= crbs_coll_ingore_tn_line_cb;
+
 	crbs->grbs.user_data = crbs;
 	htad_init(&crbs->addrs, htad_hash, grbs_addr_hash_keyeq);
 
Index: trunk/src/plugins/rt_topo/crbs_cdt.c
===================================================================
--- trunk/src/plugins/rt_topo/crbs_cdt.c	(revision 1365)
+++ trunk/src/plugins/rt_topo/crbs_cdt.c	(revision 1366)
@@ -27,6 +27,7 @@
  */
 
 #include <genvector/vtd0.h>
+#include <libgrbs/route.h>
 
 #include "geo.h"
 #include "gengeo2d/cline.h"
@@ -38,12 +39,14 @@
 	e->data = obj; \
 	if (add_grbs) { \
 		crbs_point_t *cp1 = p1->data, *cp2 = p2->data; \
+		grbs_line_t *gl; \
 		grbs_2net_t *tn = grbs_2net_new(&crbs->grbs, cop, clr); \
 		crbs_2net_t *ctn = calloc(sizeof(crbs_2net_t), 1); \
 		tn->user_data = ctn; \
 		ctn->tn = NULL; \
 		ctn->net = obj->hdr.net; \
-		grbs_line_realize(&crbs->grbs, tn, cp1->gpt, cp2->gpt); \
+		gl = grbs_line_realize(&crbs->grbs, tn, cp1->gpt, cp2->gpt); \
+		gl->user_data = ctn; \
 	} \
 } while(0) \
 
Index: trunk/src/plugins/rt_topo/crbs_route.c
===================================================================
--- trunk/src/plugins/rt_topo/crbs_route.c	(revision 1365)
+++ trunk/src/plugins/rt_topo/crbs_route.c	(revision 1366)
@@ -509,9 +509,13 @@
 			rt_topo_crbs_cdt_inc_edge(crbs, pa, na);
 	}
 
-	for(na = firsta; na != NULL; na = na->user_data)
-		if (grbs_path_realize(&crbs->grbs, crbs->routing_tn, na, 0) == NULL)
-			abort();
+	for(na = firsta; na != NULL; na = na->user_data) {
+		grbs_arc_t *arc = grbs_path_realize(&crbs->grbs, crbs->routing_tn, na, 0);
+		if (arc != NULL)
+			arc->user_data = ctn;
+		else
+			abort(); /* we have validated the path so this can not fail */
+	}
 
 	{
 		char tmp[128];