[j-nsp] MPLS fast convergence without link information

[Phil Bedard]

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" <ggglabs0 at gmail.com> 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 <p.mayers at imperial.ac.uk>
>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 ;/
>
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