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Re: brctl setfd virbr0 0.1 by default?



Daniel P. Berrange wrote:
On Mon, Jul 21, 2008 at 04:06:50PM -0400, Warren Togami wrote:
https://bugzilla.redhat.com/show_bug.cgi?id=435757
Sometime after F8, something changed where stuff attached to a bridge fails to connect until 15 seconds later. A manual workaround of brctl setfd BRIDGENAME 0.1 makes stuff work immediately.

Are there any reasons why don't we do this by default for virbr0 in libvirt?

Because no one has ever suggested it before...

Arguably we should just turn off STP on the virbr0 device. Since it is
not connected directly to the public LAN[1] there is no risk of network
loops and thus spanning tree protocol is pointless for virbr0. I wonder
if somewhere along the lines post F8 GA, STP accidentally got toggled from offf by default to on by default on virbr0. Please file a BZ about
this problem.

Daniel

[1] The only connectivity is outbound, masqueraded / NAT traffic.

Disabling STP on virbr0 alone is not enough. I just tested it now. STP enabled or disabled, the default forward delay of 15 seconds makes it fail for 15 seconds, long enough for most DHCP clients to give up.

Given this, what should we do?  Both disable STP and also reduce the delay?

Warren Togami
wtogami redhat com


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