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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: MPLS VPNs or not?
Vijay, Ok so you say that increasing the number of features in any implementation can cause critical bugs - hey I agree 100%. But what is the solution - do the freez in code and do not implement any new features and enhancements ? All vendors (at least those significant :) get a lot of new feature requests some of them touching much much deeper then the mpls-vpn implementation into the elements of bgp, ospf, isis etc .... Should all vendors just say - forget it we are not doing it as it can introduce bugs ??? If not why you are particluary so flaming mpls-vpns and not other features requested which when done wrong can cause hell lot of more issues into the networks ? R. > Vijay Gill wrote: > > --On Tuesday, August 07, 2001 08:29 -0700 Robert Raszuk <[email protected]> > wrote: > > > Vijay, > > > > I am not defending IOS bugs or any particular implementation - I am > > defending the architecture. > > > > R. > > Robert, > > the point here being that software is a complex beast that is fairly hard > to get right and often has very subtle failure modes. The interactions > between various small bugs in subsystems often result in catastrophic > failures when they interact as a part of a much larger whole. The > architecture is fine, and in fact like all Powered By PowerPoint (tm) > architectures, looks good in labs and papers, runs extremely well on slide > projectors and will probably run fine in the real world for a while too. > > However, there are real life operations folks who have to run these things > on large networks with lots of interactions among various components that > are hard to duplicate in a lab setting (else we'd have bug free code on > FCS). > > There was no singling out of IOS or any other implementation, I was just > pointing out two fairly recent failure modes in code paths that has been > exercised for years and deal with a "well known" RIB and adjacency > maintenance issues. It is entirely possible that there are no bugs in > current implementations; I just won't bet my day job on that possibility. > > > > Besides for those individuals who have problems with maintaining a > > > sinlge RIB with IGP routes I would higly advise a caution in deploying > > > an mpls-vpn service or even touching the routers :). > > That was uncalled for. We do have problems maintaining a single RIB with > IGP routes sometimes, mostly they are due to buggy implementations. > > /vijay
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