Clue's for Clue-less

Wed Oct 28 06:21:30 UTC 1998

11.1-20CC also has this feature.

-Chris

> -----Original Message-----
> From: Richard Irving [mailto:rirving at onecall.net]
> Sent: Tuesday, October 27, 1998 11:02 PM
> To: Sharif Torpis; nanog at merit.edu
> Subject: Re: Clue's for Clue-less
> 
> 
> Sharif Torpis wrote:
> > 
> > this must be an 11.2 thing?
> > 
>   Unknown... 
>   Have you ever met an 11.1.xx technician *not*
>   wearing synthetics to test it ?
> 
>   :)
> 
>   
> 
> > Richard Irving wrote:
> > >
> > > It is built into IOS.... As you approach the ceiling, it 
> sends out an
> > > SNMP log alert.
> > >
> > >  Now, how I select the number is confidential....
> > >
> > >  Ok. I will give you a hint....  I bring up the original sessions,
> > > and confirm integrity...
> > >
> > >  Then I look at the routes, size and count.
> > >
> > >  Then in the dark of the moon, wearing *no* synthetics,
> > > facing *magnetic* north... I devine the target number.
> > >
> > >   In other words... It is a judgement call...
> > >
> > >   Downstreams are easier. They must file routes with me, 
> before I route
> > >   them. I filter to the prefix.
> > >
> > >   Consider this merely another fall back mechanism to the 
> general IOPS
> > >   model.
> > >
> > > Sharif Torpis wrote:
> > > >
> > > > can u elaborate on the detection mechanism for setting off such
> > > > alarms? do u look at % change in total routes in core 
> of internet?
> > > > e.g. sunday saw a change of 55k -> 60k which is ~10% 
> change ... or do
> > > > u look at specific blocks that should not be 
> deaggregated and catch
> > > > them if they are deaggregated ... thanks
> > > >
> > > > Richard Irving wrote:
> > > > >
> > > > >    The only neighbors I lost on this one, dumped something
> > > > > they shouldn't..... If someone de-aggregates a /16,
> > > > > it fires off alarms.... Although these may be valid 
> advertisements,
> > > > > We have opted for the "safe, rather than sorry" perspective.
> > > > > (Besides, the alarms *assure* prompt attention)
> > > > >
> > > > > PS: 11.2.xx and higher have this command...
> 