On Sat, Mar 27, 2010 at 02:11:32AM -0700, Owen DeLong wrote: > Sounds like you forgot to configure the "Root is that-way ->" sanity > check on your switches. Make sure that Root bridge can't be > determined to be in a direction other than "upstream" will help > a lot with this.
No STP in the core, only on the managed edges. >> So basically, the problem is the core switches implement a proprietary >> loop-prevention protocol that sends "beacon" frames out every 500ms, >> and if a certain number of these special frames come back (exceeds >> threshold) it shuts down the port. Even with a 10:1 ratio of > > That's Icky... Can you replace that with traditional spanning tree? > It's just too sensitive for a deployment of any real size. STP is eliminated by vendor's design recommendations. Active/active split LAG across two core boxes. But yes, I agree that this design is proving--lacking. >> The good news is that this core is being replaced soon, hopefully with >> gear that will be able to implement a service-provider-like design >> with per-port VLAN separation as was suggested in this thread. But it >> surprises me that low-end switch vendors (like NetGear) still put out >> crap that doesn't do STP, especially when the switch does Auto >> MDI/MDI-X, which is just asking for trouble. >> > Usually people don't use Netgear cheap switches in environments with > more than a desktop worth of topology. We don't generally put them in, users do. There are a few cases where we have a dearth of cable or conduit space and needed something small and quiet to put there. Hence my question about better switches to use in those scenarios. >> Anyone know if Auto MDI/MDI-X is inherent or required in 1000Base-T? >> It would be nice if I could shut it off. >> > Yes, it is. (This is actually a good thing in everyone else's > environment). It's easy to claim that no one else but me has this problem. Designing a "dekstop" switch that makes it easy to create accidental loops, but then has no loop-prevention mechanism seems irresponsible to me...
