From: Todd Carswell (acarswell@xxxxxxxxx)
Date: Thu Mar 28 2002 - 16:20:31 GMT-3
Wade,
When a route goes down, the routing protocol will announce an unreachable
metric until the dead-timer expires. This has nothing to do with poison
reverse.
Todd
----- Original Message -----
From: "Wade Edwards" <wade.edwards@powerupnetworks.com>
To: "Todd Carswell" <acarswell@nc.rr.com>
Cc: <ccielab@groupstudy.com>
Sent: Thursday, March 28, 2002 1:39 PM
Subject: RE: Off topic, What does "Poison" mean here?
This is not entirely true. When a route goes missing, the router will
announce an infinite (or poisoned) metric so other routers will know
that it is unavailable. If a router gets a poisoned metric for a route
which it has a good metric for it will ignore it because I thinks it has
a better route.
HTH
L8r.
-----Original Message-----
From: Todd Carswell [mailto:acarswell@nc.rr.com]
Sent: Thursday, March 28, 2002 12:13 PM
To: Todd Carswell; Sean C.; Ma Gang; ccielab@groupstudy.com
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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