In reply to
http://www.redhat.com/archives/libvir-list/2007-April/msg00177.html
an area where vde_switch support is usefull is an unprivileged user
running tests. A test suite involving the creation of qemu instances
thru libvirt should not be forced to create a bridge or alter the
iptables configuration. With vde_switch and slirpvde multiple qemu
instances can be run without altering the network configuration of the host.
I hope it helps.
Cheers
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