I know they are somewhat expensive but we use test tools from Spirent (TestCenter) or Ixia (N2X, etc) which can measure reconvergence times down to the microsecond.
Phil On 1/2/12 3:47 AM, "Mark Smith" <[email protected]> wrote: >Hi > >Thanks for help everybody. > >One further question: do you have recommendations of tools to perform >network convergence testing? I.e. generally available sw that is >capable of measuring network outage times in the order of magnitude of >milliseconds? > >I have traditionally used linux and fping, something like fping -l -p >10 -i 10 -t 10 to get the low-precision measurement of outage in 10 >milliseconds. Does this make sense to you? > > >On Thu, Dec 29, 2011 at 9:36 PM, Phil Mayers <[email protected]> >wrote: >> On 12/29/2011 06:48 PM, Mark Smith wrote: >> >>> I would not expect the L2 service provider to be able to tunnel >>> ethernet OAM (CCM etc) traffic. >> >> >> In general, or in this specific case? > >In general at this point. By building your stuff on the assumption >that your "subcontractor" or partner is able to do something >"specific" not mentioned in contract you increase the risk of extra >problems and/or work in case something goes wrong or changes. > >For example let's assume you lease L2 lines and notice that OAM >traffic is passed fine. You test and build your network to rely on >this functionality. After some time your L2 provider experiences >hardware failure and they decide to replace the failed component with >different model, config, sw version etc. As a result OAM traffic is >not forwarded anymore and you need to do changes to your >configuration. The provider does not tell you anything, because your >service (L2 line) is restored. > >Another example might be that you need to change L2 provider to >different one and again they don't forward OAM. > >I have seen things like this happen on several occasions and I would >like to avoid them if possible. Also remember the murphy's law: if >(and when) anything goes wrong, it will happen on the worst possible >moment. I.e. in the middle of midsummer night when you (and your >capable colleagues) are 5 ‰ drunk ;/ > >_______________________________________________ >juniper-nsp mailing list [email protected] >https://puck.nether.net/mailman/listinfo/juniper-nsp _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
