diff --git a/lib_vrf.bash b/lib_vrf.bash
new file mode 100755
index 00000000..233dc38f
--- /dev/null
+++ b/lib_vrf.bash
@@ -0,0 +1,49 @@
+#!/bin/bash
+
+# create an associative array of vrf interfaces and their ports
+
+IFLINES=()
+declare -A IFNAMES
+declare -A VRFNAMES
+
+while read line; do
+   IFLINES+=("$line")
+done < <(ip -o link show)
+
+RE_MASTER=' master ([^ ]+) state '
+for item in "${IFLINES[@]}"; do
+   #echo -e "\t$item"
+   [[ x$item = x ]] && continue
+
+   IFS=': ' hunks=($item)
+   [[ "${hunks[1]}" = "" ]] && continue
+
+   ifname="${hunks[1]}"
+   [[ "$ifname" = *NOARP,MASTER* ]] && continue
+
+   IFNAMES["$ifname"]="unknown"
+
+   if [[ $item = *master* ]] && [[ $item = *vrf* ]]; then
+      #echo "Looking for vrf in $ifname"
+      if [[ $item =~ $RE_MASTER ]]; then
+         [[ x${BASH_REMATCH[1]} = x ]] && continue;
+         vrfname=${BASH_REMATCH[1]};
+         #echo "[[[$ifname]]]  [[[$vrfname]]]"
+         IFNAMES["$ifname"]="$vrfname"
+         VRFNAMES["$vrfname"]="$ifname"
+      fi
+   fi
+done
+
+if [[ x$VRF_DEBUG = x1 ]]; then
+   echo "Interfaces: "
+   for ifname in "${!IFNAMES[@]}"; do
+      echo "IFN   $ifname => ${IFNAMES[$ifname]}"
+   done
+
+   echo "virtual routers: "
+   for vrfname in "${!VRFNAMES[@]}"; do
+      echo "VRF   $vrfname => ${VRFNAMES[$vrfname]}"
+   done
+fi
+#