#!/bin/bash
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# to you under the Apache License, Version 2.0 (the
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# 
#   http://www.apache.org/licenses/LICENSE-2.0
# 
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nw_label=$1
br=`xe network-list name-label="$nw_label" params=bridge |cut -d ':' -f 2 |tr -d ' ' `
pbr=`ovs-vsctl br-to-parent $br`
while [ "$br" != "$pbr" ]
do
    br=$pbr
    pbr=`ovs-vsctl br-to-parent $br`
done
echo $pbr