Added a short-hand for setting the OCI variable.
Added export.

Change-Id: I1e9b5366ce460995d494f7df81659fea0b6c8584
diff --git a/tools/test/bin/onos-topo-cfg b/tools/test/bin/onos-topo-cfg
index d3a4f0d..258bfe7 100755
--- a/tools/test/bin/onos-topo-cfg
+++ b/tools/test/bin/onos-topo-cfg
@@ -6,7 +6,7 @@
 [ ! -d "$ONOS_ROOT" ] && echo "ONOS_ROOT is not defined" >&2 && exit 1
 . $ONOS_ROOT/tools/build/envDefaults
 
-node="${1:-$OC1}"
+node="${1:-$OCI}"
 file="${2:-$ONOS_ROOT/tools/test/topos/oe-linear-3.json}"
 
 curl -sS --fail -L -X POST -H 'Content-Type:application/json' \