On Tue, 22 Aug 2000 [EMAIL PROTECTED] wrote:
> Studying for the CCNA, I'm having trouble figuring out what the deal is with
> poisen reverse.
>
> I understand split horizon as not sending route updates back out the port
> they are received on, and I understand route poisening as specifically
> advertising a down route as bad, as opposed to just not sending any info
> about it at all. From reading in the Sybex as well as both Cisco Press ccna
> books I understand poisen reverse as sending a route poisening back out the
> port it was received in order to facilitate faster convergence and avoid
> loops in large networks.....and then they move on as if that's the end of the
> story.
>
> So Router A notices a down link on one of it's ports and sends an update to
> Router B telling it about the down route. Router B then sends an update back
> to Router A informing it of the fact. At this point the Router A in me wants
> to say, "No Kidding it's down, I just told YOU that, why are you bothering me
> with this information."
>
> There must be something basic I am missing here, such as just what is Router
> A doing with the poisen reverse update it gets from Router B telling it it
> knows the route is bad.
it doesn't get one from B, because of split-horizon
>
> Any comments appreciated.
>
> Joe
>
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-----------------------------------------------
Brian Feeny, CCNA, CCDA [EMAIL PROTECTED]
Network Administrator
ShreveNet Inc. (ASN 11881)
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