From: Sean C (Upp_and_Upp@xxxxxxxxxxx)
Date: Thu Mar 28 2002 - 16:50:47 GMT-3
Todd,
Never wrote that the network couldn't be reached. The network is advertised
with a 'spoiled' response - ie hop of 16, etc.
Per one brilliant author of "Designing Routing and Switching Architectures",
p285 - "Poisoned reverse sends an update back to the originator, but with an
infinite metric to indicate the sending router believes the route to be
down." Infinite metric, spoiled response, poisoned network.
Sean
----- Original Message -----
From: "Todd Carswell" <acarswell@nc.rr.com>
To: "Todd Carswell" <acarswell@nc.rr.com>; "Sean C."
<Upp_and_Upp@hotmail.com>; "Ma Gang" <matthen@zisco.com.cn>;
<ccielab@groupstudy.com>
Sent: Thursday, March 28, 2002 1:12 PM
Subject: Re: Off topic, What does "Poison" mean here?
> Sean,
>
> Actually, the router who is utilizing "poison reverse" can, in fact, reach
> the destination in question. If it could not reach it, then it would not
be
> in any routing updates.
>
> In essence, the "poison-reverse" router is telling it's neighbor, "Hey, I
> can reach this network, but you told me about it so don't try to reach it
> through me!"
>
> Todd
>
>
> ----- Original Message -----
> From: "Todd Carswell" <acarswell@nc.rr.com>
> To: "Sean C." <Upp_and_Upp@hotmail.com>; "Ma Gang" <matthen@zisco.com.cn>;
> <ccielab@groupstudy.com>
> Sent: Thursday, March 28, 2002 12:46 PM
> Subject: Re: Off topic, What does "Poison" mean here?
>
>
> > I view "poison reverse" as another way of saying that "bad news is
better
> > than no news at all".
> >
> > Todd Carswell
> >
> >
> >
> > ----- Original Message -----
> > From: "Sean C." <Upp_and_Upp@hotmail.com>
> > To: "Ma Gang" <matthen@zisco.com.cn>; <ccielab@groupstudy.com>
> > Sent: Thursday, March 28, 2002 1:16 AM
> > Subject: Re: Off topic, What does "Poison" mean here?
> >
> >
> > > Hi Matthew,
> > >
> > > Per Perlman "Interconnections, 2nd Ed." p 306 - "Poison reverse means
> > > reporting a value of infinity to explicitly report that you can't
reach
> D
> > > rather than simply not mentioning D." So, instead of not
acknowledging
> > > something, the issue in question is acknowledged, but with an answer
> that
> > is
> > > not valid, thus 'spoiling' the output.
> > >
> > > Is this what you are asking or are you asking why was 'poison' chosen
> > > instead of words such as 'corrupt' or 'defile'?
> > >
> > > Sean
> > > ----- Original Message -----
> > > From: "Ma Gang" <matthen@zisco.com.cn>
> > > To: <ccielab@groupstudy.com>
> > > Sent: Wednesday, March 27, 2002 7:01 PM
> > > Subject: Off topic, What does "Poison" mean here?
> > >
> > >
> > > Dear All,
> > >
> > > We may be familiar with "Route Poisoning" or "Poison Reverse". But
what
> > does
> > > "poison" mean here? As I imagine, there may be 2 answers
> > >
> > > 1. The name of a French mathematician. He invented the algorithm,
which
> is
> > > used in Distance Vector routing protocol now.
> > >
> > > 2. Another expression way of "block".
> > >
> > > Which one is correct? Or maybe some other answers?
> > >
> > >
> > >
> > > Matthew Ma
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