On Wed, 24 Jan 2007 09:30:41 -0800 Michael Boutte <mboutte at pacbell.net> wrote: > Hello, > I am experiencing what may be a unique problem with operating the > bridge. My hardware is custom Freescale MPC875 processor based with one > ethernet (eth0) and one hdlc (hdlc0) WAN port and I am connecting two of > these boards together using the WAN ports over a long distance - > essentially two bridges in series. They are running Linux 2.6.15 with > bridging enabled in the kernel configuration. When I first power up both > boards the bridge comes up fine and the two outside LANs are connected > as if it were one LAN with a smart long cable in between. brctl works to > set it up and the "showmacs" properly shows all of the MACs on each end. > > The problem occurs If I disconnect the ethernet cable directly from the > bridge at either end. The console on the disconnected units says "br0: > port 2(eth0) entering disabled state". When I reconnect the cable it > shows "br0: port 2(eth0) entering learning state" plus messages about > network topology change detected. That LAN end no longer has a link to > the other end, yet at the console of the unit disconnected and > reconnected I can ping in either direction to any device in both LAN > segments. Time makes no difference, but if I issue the command "ifconfig > eth0 down" and then back "up" the link is almost immediately restored. > This works either while the cable is disconnected or after it is > reconnected. > > I compared the effect of a cable disconnect with a standard PC running > Linux and it seems to be identical, that is, ifconfig shows the port as > up even when the cable is disconnected on both. I tried having STP > enabled or disabled, and adding the ports into br0 in the opposite order > with no difference either. Any ideas on why the bridge does not > automatically restore? and especially on how I can make it automatically > restore itself? > > Thank you for your kind attention. > > Mike Boutte You probably don't want the forwarding delay period (30 seconds) that occurs on link transitions. Use: brctl setfd br0 0 -- Stephen Hemminger <shemminger at linux-foundation.org>
