gistfile1.txt

$ ./setup-brvlan-pair.sh
=> /etc/sysconfig/network-scripts/ifcfg-brvlan2001
DEVICE=brvlan2001
TYPE=Bridge
BOOTPROTO=none
ONBOOT=yes
=> /etc/sysconfig/network-scripts/ifcfg-vlan2001
DEVICE=vlan2001
BOOTPROTO=none
ONBOOT=yes
BRIDGE=brvlan2001
PHYSDEV=ethxxx

$ ifup vlan2001

setup-brvlan-pair.sh

#!/bin/bash
#
# requires:
#  bash
#
set -e
set -o pipefail
#set -x

# variables

## vlan

tagged_id=${1:-2001}

vlan_if=vlan${tagged_id}
physdev_if=ethxxx

## bridge

bridge_if=brvlan${tagged_id}

# functions

function exists_ifcfg?() {
  local device=${1}

  if [[ -f /etc/sysconfig/network-scripts/ifcfg-${device} ]]; then
    echo "already exists: /etc/sysconfig/network-scripts/ifcfg-${device}" >&2
    return 1
  fi
}

#  ~~~
#   |
# ${physdev_if}
#   |
# ${vlan_if}   bridge=${bridge_if} physdev=${physdev_if}
#   |
# ${bridge_if}
#

# ./bin/ifcfg-setup render bridge ${bridge_if}

## validate

exists_ifcfg? ${bridge_if}
exists_ifcfg? ${vlan_if}

## main

echo "=> /etc/sysconfig/network-scripts/ifcfg-${bridge_if}"

cat <<EOS
DEVICE=${bridge_if}
TYPE=Bridge
BOOTPROTO=none
ONBOOT=yes
EOS

# ./bin/ifcfg-setup render vlan   ${vlan_if}   bridge=${bridge_if} physdev=${physdev_if}
echo "=> /etc/sysconfig/network-scripts/ifcfg-${vlan_if}"

cat <<EOS
DEVICE=${vlan_if}
BOOTPROTO=none
ONBOOT=yes
BRIDGE=${bridge_if}
PHYSDEV=${physdev_if}
EOS

##
echo

cat <<EOS
$ ifup ${vlan_if}
EOS