[Qemu-discuss] Redundant VDE network

[Dmitry Antipov]

I'm using QEMU 2.1.1 to emulate SPARC system and have vde network between two
VMs and host system, organized as shown:

              host
              tap0
        + 192.168.100.254 +
        |                 |
        |                 |
        vm0               vm1
        eth0              eth0
    192.168.100.1 --- 192.168.100.2

On host, I'm running vde_switch and extra stuff as:

vde_switch -tap tap0 -daemon -mod 660 -group [group]
ip addr add 192.168.100.254/24 dev tap0
ip link set tap0 up
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -s 192.168.100.0/24 -o [external network iface] 
-j MASQUERADE

VMs are running with:

qemu-system-sparc -m 256 -net nic -net vde -hda vm0.img
qemu-system-sparc -m 256 -net nic -net vde -hda vm1.img

Everything looks good, but...

...the problem: I need to build redundant network by using the same method, i.e.
improve the network shown above with:

              host
              tap1
        + 192.168.101.254 +
        |                 |
        |                 |
        vm0               vm1
        eth1              eth1
    192.168.101.1 --- 192.168.101.2

I'm trying to run two vde switches:

vde_switch -sock /tmp/vde0 -tap tap0 -daemon -mod 660 -group [group]
vde_switch -sock /tmp/vde1 -tap tap1 -daemon -mod 660 -group [group]

and run VMs with:

qemu-system-sparc -m 256 -net nic,vlan=1 -net vde,sock=/tmp/vde0,vlan=1 -net 
nic,vlan=2 -net vde,sock=/tmp/vde1,vlan=2 -hda vm0.img

but the result is:

Warning: hub port hub2port0 has no peer
Warning: vlan 2 with no nics
Warning: netdev hub2port0 has no peer
Warning: requested NIC (anonymous, model unspecified) was not created (not 
supported by this machine?)

Is it possible to build redundant network as described above? What I'm doing 
wrong?

Thanks in advance,
Dmitry