Priscilla,
Isn't there a difference between poison reverse (which is a variation on
split horizon) and route poisoning? I thought poison reverse took place
each time a route was learned. For example, router A advertises network 1
to router B. Router B immediately poison reverses the route to r
Oh. I think I missed the point the first time around. You are stating as
known fact that Cisco RIP definitely does not reverse poison the route
immediately upon learning the route (what I would think of as a classic
definition of poison reverse). This must be one of those rare ambiguous
uses of
Cisco does actually support a form of poison reverse with RIPv1 and v2.
It's not proactive, but it still fits the definition.
When a router loses a route to a network behind it, it announces that it
can't get to the network by sending a RIP update that lists the network
with a distance of 16.
These terms aren't defined authoritatively anywhere, but thinking about the
English-language meaning of the terms does help. Poisoning a route simply
means stating that a route is unreachable. If it's sent in the reverse
direction, then it's poison reverse.
Poison reverse is usually used as a
I should read more carefully on a Monday morning. My earlier reply
"disappeared" because it was under a different heading. Your earlier
experiment proved that route poisoning was working as it should.
I'm off to eat raw coffee beans
s vermill wrote:
>
> My earlier reply must have went in
My earlier reply must have went into the bit bucket. Here goes again...
The hold down timer doesn't prevent the triggered update from poisoning the
bad route. It prevents the router that just received the poison update from
accepting any new updates that would indicate the route is back up. I
p1-r1(config-if)#
-Original Message-
From: Phil Barker [mailto:[EMAIL PROTECTED]]
Sent: Monday, January 28, 2002 8:03 AM
To: Pierre-Alex GUANEL; [EMAIL PROTECTED]
Subject: Re: Poison Reverse and RIP [7:33402]
Whe
Where did you find this info ?
Cisco DOES support poison reverse in their IP RIP
implementations. They set the metric to infinity or
16.
I have verifified this by lab using a sniffer.
See :
http://www.cisco.com/univercd/cc/td/doc/product/aggr/vpn5000/5000mgr/mgrref/iproutg.htm#xtocid113217
or t
8 matches
Mail list logo
