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[Xen-users] network-bridge works only for maximum 3 bridges

xen_major              : 4
xen_minor              : 5
xen_extra              : .2-pre
xen_version            : 4.5.2-pre

when i create VM with 4 (or more) bridge interfaces only first 3 works of them
brctl show me created by the xen script vifX.Y interfaces as expexted
but when i do tcpdump on vifX.3 i see no traffic

when i tcpdump bridge itself or phisical interface inside the bridge then i can see network traffic

i tried change order of bridge interfaces in VM config - 3 first forks fine, 4 and further - no traffic
it is no matter which interface is 4th by order, first 3 always works fine

vif = [ 'bridge=pvlan50', 'bridge=pvlan53', 'bridge=pvlan101', 'bridge=pvlan70' ]
pvlan70 has no traffic
vif = [ 'bridge=pvlan50', 'bridge=pvlan53', 'bridge=pvlan70', 'bridge=pvlan101' ]
pvlan101 has no traffic, but 50 53 and 70 works fine

then i started VM with 3 bridges and attached 4th bridge after VM is started via 'xl network-attach'
no luck

yes, openvswitch is a great solution, but i have many servers where i can't stop VMs for reconfigure network

maybe i do something wrong ?

# uname -a
Linux xcalc 4.1.8 #1 SMP Fri Sep 25 14:23:38 MSK 2015 x86_64 x86_64 x86_64 GNU/Linux

ubuntu 14.04 server
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