Index: trunk/src/plugins/rt_topo/crbs.h
===================================================================
--- trunk/src/plugins/rt_topo/crbs.h	(revision 1344)
+++ trunk/src/plugins/rt_topo/crbs.h	(revision 1345)
@@ -50,6 +50,8 @@
 	gdl_list_t twonets; /* of crbs_2net_t */
 	htad_t addrs;
 
+	unsigned disable_concave:1;   /* when set to 1, do an all-convex routing */
+
 	/* routing */
 	grbs_detached_addr_t *first;  /* the address the twonet is starting from */
 	grbs_detached_addr_t *target; /* the address we are trying to reach */
Index: trunk/src/plugins/rt_topo/crbs_route.c
===================================================================
--- trunk/src/plugins/rt_topo/crbs_route.c	(revision 1344)
+++ trunk/src/plugins/rt_topo/crbs_route.c	(revision 1345)
@@ -276,6 +276,11 @@
 		while(a->grbs_idx < 4) {
 			printf(" try from %s P%ld to P%ld", from_type, curr->pt->uid, pt->gpt->uid);
 
+			if (crbs->disable_concave) {
+				if (a->grbs_idx < 2)
+					a->grbs_idx = 2;
+			}
+
 			/* prefer concave over convex; order matters when reaching target: first
 			   valid solution will stop the search */
 			switch(a->grbs_idx) {
@@ -572,6 +577,7 @@
 
 	memset(&crbs, 0, sizeof(crbs_t));
 	rt_topo_crbs_cdt_init(ctx, ly, &crbs);
+	crbs.disable_concave = 1;
 	crbs_init(&crbs, ctx);
 
 	rtrnd_layer_init(&ly_cdt, "laa");