[PVE-User] SPAN port on bridge - not working in 3.x

[Lex Rivera]

Hello. 
I have machine which have span port from physical switch for VMs.

Interface config:
----
auto eth3
allow-hotplug eth3
iface eth3 inet manual
        up /sbin/ifconfig $IFACE up
        downp /sbin/ifconfig $IFACE down

        post-up ethtool -K eth4 sg off
        post-up ethtool -K eth4 tso off
        post-up ethtool -K eth4 gso off
        post-up ethtool -K eth4 gro off
        post-up ethtool -K eth4 lro off
        post-up ethtool -K eth4 tco off

auto vmbrspan
iface vmbrspan inet manual
        bridge_ports eth3
        bridge_stp off
        bridge_fd 0
        post-up /usr/sbin/brctl setageing $IFACE 0
----
pveversion:
----
lex at galleon > pveversion -v
pve-manager: 3.0-23 (pve-manager/3.0/957f0862)
running kernel: 2.6.32-20-pve
proxmox-ve-2.6.32: 3.0-100
pve-kernel-2.6.32-20-pve: 2.6.32-100
pve-kernel-2.6.32-19-pve: 2.6.32-96
pve-kernel-2.6.32-18-pve: 2.6.32-88
lvm2: 2.02.95-pve3
clvm: 2.02.95-pve3
corosync-pve: 1.4.5-1
openais-pve: 1.1.4-3
libqb0: 0.11.1-2
redhat-cluster-pve: 3.2.0-2
resource-agents-pve: 3.9.2-4
fence-agents-pve: 4.0.0-1
pve-cluster: 3.0-4
qemu-server: 3.0-20
pve-firmware: 1.0-22
libpve-common-perl: 3.0-4
libpve-access-control: 3.0-4
libpve-storage-perl: 3.0-8
vncterm: 1.1-4
vzctl: 4.0-1pve3
vzprocps: 2.0.11-2
vzquota: 3.1-2
pve-qemu-kvm: 1.4-13
ksm-control-daemon: 1.1-1
----
It worked in proxmox 2.3.x, but after upgrade to 3.0-23 i can't see span
traffic from inside VMs.
I can see mirrored data on host node, both on eth3 and on vmbrspan, but
not on tapXXXiY interface.
Any ideas?