On Wed, 23 Nov 2005 09:10:56 -0800 Bob Snyder <oceansidebob@xxxxxxxxx> wrote: > Hello, > > I have built a data link system (i.e. microwave radio) with bridges at > both ends of the link (sort of back-to-back). The data link boxes have > highly asymetrical RS-422 serial interfaces which are interfaced to > the bridges with dscc4/hdlc/syncppp modules. Also, the bridges each > have one regular ethernet port. The intention is to have the ethernet > at one end appear to be connected to the ethernet at the other end. > Also, one end is usually connected to a busy lan with lots of > broadcast traffic. The bridges are running on 266 MHz Pentiums with no > other load. > > The system works in general, but sometimes there are very long and > erratic delay times (up to several seconds) when pinging through the > link. If the radio link is brought up before the bridges are started, > things seem to work well (ping times of ~10-15 ms). The problem seems > to occur if the bridges are started before the radio link is brought > up. Once the problem appears it will persist until the bridge is > restarted. > > I wondered if the problems is that the MAC table was getting too big. > I reduced the ageing time from 300 to 30 seconds, and this seemed to > help (the MAC table got smaller), but the problem persists. Also the > problem can be seen sometimes when not connected to the lan, so maybe > I just don't have the bridge configured properly. > > Any help or suggestions appreciated. > Does the interface implement broadcast/muliticast? Also the bridge takes 30 seconds to go through the learning phase when interface is attached per STP spec. -- Stephen Hemminger <shemminger@xxxxxxxx> OSDL http://developer.osdl.org/~shemminger
