Index: trunk/src/plugins/rt_topo/crbs.c
===================================================================
--- trunk/src/plugins/rt_topo/crbs.c	(revision 1338)
+++ trunk/src/plugins/rt_topo/crbs.c	(revision 1339)
@@ -38,6 +38,8 @@
 
 #include "crbs.h"
 
+static crbs_2net_t tn_unknown;
+
 static void crbs_coll_report_cb(grbs_t *grbs, grbs_2net_t *tn, grbs_2net_t *coll_tn, grbs_arc_t *coll_arc)
 {
 	crbs_t *crbs = grbs->user_data;
@@ -44,10 +46,24 @@
 	crbs_2net_t *coll_ctn = coll_tn->user_data;
 /*	crbs_2net_t *ctn = tn->user_data;*/
 
-	htpi_set(&crbs->coll_nets, coll_ctn, 1);
+	if (coll_ctn != &tn_unknown)
+		htpi_set(&crbs->coll_nets, coll_ctn, 1);
 }
 
+static grbs_2net_t *crbs_coll_check_arc_cb(grbs_t *grbs, grbs_2net_t *tn, grbs_arc_t *arc)
+{
+	crbs_point_t *pt = arc->parent_pt->user_data;
 
+	EDGELIST_FOREACH(edge, (pt->cpt->adj_edges)) {
+		crbs_edge_t *e = edge->data;
+		if (e->nets > 0) {
+#warning TODO: check if edge is crossed
+		}
+	}
+	EDGELIST_FOREACH_END();
+}
+
+
 crbs_point_t *crbs_point_new(crbs_t *crbs)
 {
 	crbs_point_t *p = calloc(sizeof(crbs_point_t), 1);
@@ -66,6 +82,7 @@
 	grbs_init(&crbs->grbs);
 	crbs->ctx = ctx;
 	crbs->grbs.coll_report_cb = crbs_coll_report_cb;
+	crbs->grbs.coll_check_arc = crbs_coll_check_arc_cb;
 	crbs->grbs.user_data = crbs;
 	htad_init(&crbs->addrs, htad_hash, grbs_addr_hash_keyeq);
 	htpi_init(&crbs->coll_nets, ptrhash, ptrkeyeq);