This sets up and starts a couple OpenBSD carped virtual machines using qemu and flashrd.

qemu_carp_on_vlans.sh

#!/bin/sh
# This uses qemu, so pkg_add qemu

# Download and extract flashrd, either from github or here:
# http://www.nmedia.net/flashrd/

# Grab a flashrd image from here:
# http://www.nmedia.net/flashrd/images/
# and set the name:
flashimg=flashimg.amd64.pccons-20130318 

# Set a path where you have space to copy the images
test_path=`mktemp -d`

# And setup the path where we can find cfgflashrd
flashrd_root=$PWD

cd $test_path

### XXX NOTE XXX ###
# This is going to remove ./test in $test_path
####################
rm -r test

# This started as is a shell archive.  Save it in a file, remove anything before
# this line, and then unpack it by entering "sh file".  Note, it may
# create directories; files and directories will be owned by you and
# have default permissions.
#
# This archive contains:
#
#   test/
#	test/rtr01
#	test/rtr01/etc
#	test/rtr01/etc/hostname.vlan10
#	test/rtr01/etc/hostname.fxp0
#	test/rtr01/etc/hostname.carp10
#	test/rtr02
#	test/rtr02/etc
#	test/rtr02/etc/hostname.carp10
#	test/rtr02/etc/hostname.fxp0
#	test/rtr02/etc/hostname.vlan10
#
echo c - test/
mkdir -p test/ > /dev/null 2>&1
echo c - test/rtr01
mkdir -p test/rtr01 > /dev/null 2>&1
echo c - test/rtr01/etc
mkdir -p test/rtr01/etc > /dev/null 2>&1
echo x - test/rtr01/etc/hostname.vlan10
sed 's/^X//' >test/rtr01/etc/hostname.vlan10 << 'END-of-test/rtr01/etc/hostname.vlan10'
Xvlandev fxp0
Xinet 192.168.2.1/24
END-of-test/rtr01/etc/hostname.vlan10
echo x - test/rtr01/etc/hostname.fxp0
sed 's/^X//' >test/rtr01/etc/hostname.fxp0 << 'END-of-test/rtr01/etc/hostname.fxp0'
Xinet 10.0.1.1/24
END-of-test/rtr01/etc/hostname.fxp0
echo x - test/rtr01/etc/hostname.carp10
sed 's/^X//' >test/rtr01/etc/hostname.carp10 << 'END-of-test/rtr01/etc/hostname.carp10'
Xcarpdev vlan10
Xvhid 10
Xinet 192.168.2.100/24
END-of-test/rtr01/etc/hostname.carp10
echo c - test/rtr02
mkdir -p test/rtr02 > /dev/null 2>&1
echo c - test/rtr02/etc
mkdir -p test/rtr02/etc > /dev/null 2>&1
echo x - test/rtr02/etc/hostname.carp10
sed 's/^X//' >test/rtr02/etc/hostname.carp10 << 'END-of-test/rtr02/etc/hostname.carp10'
Xcarpdev vlan10
Xvhid 10
Xadvskew 100
Xinet 192.168.2.100/24
END-of-test/rtr02/etc/hostname.carp10
echo x - test/rtr02/etc/hostname.fxp0
sed 's/^X//' >test/rtr02/etc/hostname.fxp0 << 'END-of-test/rtr02/etc/hostname.fxp0'
Xinet 10.0.1.2/24
END-of-test/rtr02/etc/hostname.fxp0
echo x - test/rtr02/etc/hostname.vlan10
sed 's/^X//' >test/rtr02/etc/hostname.vlan10 << 'END-of-test/rtr02/etc/hostname.vlan10'
Xvlandev fxp0
Xinet 192.168.2.2/24
END-of-test/rtr02/etc/hostname.vlan10

cd test
for d in */; do cd $d && tar czvf ../${d%/}.tgz *; cd -; done
cd ..

cd $flashrd_root

export ETHER=vether0

sudo ifconfig $ETHER 10.0.1.99/24 up
sudo ifconfig bridge0 add $ETHER
sudo ifconfig vlan10 vlandev $ETHER 192.168.2.99/24

_mac=0
_pids=''
for f in ${test_path}/test/*.tgz; do
  [ -e $f ] || break

  hostname=`basename ${f%.tgz}`
  img=${test_path}/${hostname}.img
  echo "$hostname [$img]"

  cp ${flashrd_root}/$flashimg $img
  sudo ${flashrd_root}/cfgflashrd -i $img -o $f -hostname $hostname

  _mac=$(($_mac + 1 ))
  _macaddr=macaddr=52:54:00:12:34:5${_mac}
  qemu-system-x86_64 $img -net nic,model=i82551,${_macaddr} -net tap &
  _pids="$_pids $!"
done

echo "Waiting for qemu to exit [$_pids]"
wait $_pids

ifconfig | sed -ne 's/^\([a-z0-9]*\):.*/\1/p' |
  grep -e tun -e bridge -e vlan -e vether     |
  xargs -I % sudo ifconfig % destroy