On Thu, Apr 15, 2010 at 09:23:46PM +0200, Francesco Pretto wrote: > Hello, > > when talking about networking in hypervisors, it's easy to distinguish > the two classic configurations, NAT and bridged, and the official > libvirt wiki does exactly in this way here [1]. NAT networking is > already configured by libvirt creating a bridge called libvirt0, while > bridged networking have to be configured manually by the user. > > The libvirt0 bridge for NAT networking is default configured in this way: > STP=on > MAXWAIT=0 > > While suggested br0 bridge for bridged networking is configured in this way: > STP=off > MAXWAIT=5 I don't believe we're recommending STP=off for bridging. Our recommended config is # cat > ifcfg-br0 <<EOF DEVICE=br0 TYPE=Bridge BOOTPROTO=dhcp ONBOOT=yes DELAY=0 NM_CONTROLLED=no EOF And IIUC, STP defaults to on if not specified. I agree STP should always be on for bridging to avoid netloops. The main important param DELAY=0 is there to ensure that you get instant network connectivity when doing live migration - without it you'll get a 30 second network blackout Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|
