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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: MAE West
> On Fri, 11 Jul 1997, Rodney Joffe wrote: > > > By the way, to expand the thread, I have the feeling that the three > > OC-3s from NASA Ames side to MFS all go to GIGA 1, which then has fddi > > loops to GIGA 2 and then to GIGA 3. > > > > Does anyone know if this is the case? > > > > If it is, seems that a better design would have been to route some of > > the OC-3s to the other GIGAs first. If 1 is down, then it can't pass > > traffic through to 2 and 3, so there is a single point of failure for > > all the switches at MFS. > > The Gigaswitch constrains us to a loop-free topology, so there's no way to > avoid a single point of failure in a case like this. > > The Gigaswitch systems in general have been quite reliable over the last > few years, modulo individual line card failures. The problems we tend to > see are either load-related or caused by human error. This is the first > major outage caused by a Gigaswitch itself that we've seen in a very > long time. > > By the way, as of yesterday it's four OC3's between Ames and MFS. > Steve > > Steve, Are you telling me that the GigaSwitch, unlike every other bridge since well before I became involved in networking, is incapable of spanning tree? I find that hard to believe. Could anyone on the list from DEC please confirm or deny this absurdity? Owen
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