brctl setfd br0 0Sets the forwarding delay on the bridge to 0, making it forward immediately, instead of going into 'learning' mode. This affects the entire bridge, not just a single port.
Thanks for the suggestions. I already reduced it to 1, but was wary of trying 0.
Would that make spanning tree flap? Or is there still some hysteresis loop allowing it to stabilize?
We have a transparent traffic shaper which sometimes locks up. The port to the bandwidth shaper I know will always need to be in forwarding mode. When spanning tree detects that the traffic shaper is no longer passing traffic, the other port will need to start forwarding in order to bypass it and reach the routers beyond.
Regards,
LeighLeigh Sharpe
Network Systems Engineer
Pacific Wireless
Ph +61 3 9584 8966
Mob 0408 009 502
From: richardvoigt@xxxxxxxxx [mailto:richardvoigt@xxxxxxxxx]
Sent: Friday, July 06, 2007 10:03 AM
To: bridge@xxxxxxxxxxxxxxxxxxxxxxxxxx
Subject: jumpstart stp port to forwarding state
Sorry if this is a dupe, but the mailing list join email got delayed by 10 or 12 hours and so I think this message wasn't accepted:
I've googled for this, but since there are so many pages talking about linux boxes connected to CIsco equipment, I can't find anything relevant.
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Does linux bridging support anything like cisco's portfast (port starts in forwarding state)? Is there a way (sysfs, ioctl) to at least change a port to forwarding immediately? Even bridges with stp disabled take some time bringing ports up after a topology change. If the delay can't be eliminated, can I wait for it somehow in my startup scripts to avoid initial connection failures?
My preference would be to have something like:
brctl portfast br0 bond0.10 on
or
brctl initialstate br0 bond0.10 forwarding
Also, can stp disable all ports in the same bridge? I would assume not, a minimum spanning tree needs at least one port forwarding (could that port somehow be a different interface on the same box, not a member of the bridge?). If at least one port is always forwarding, could the minimum cost port be set to forwarding by default when the bridge is brought up (ip link set br0 up) irrespective of any portfast-alike setting?
I'm trying to minimize startup time on a firewall.
Thanks for any information you can provide.
Ben Voigt
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