Re: Poison-reverse

Split horizon refers to the rule that information about a route will not be
sent out the same
interface or subinterface from which it was received (problem in multipoint
configurations)

no ip split-horizon for RIP networks
no ip split-horizon as# for EIGRP networks

Poison reverse The rule for poison reverse is to advertise a route out the
interface on
which it was received with an unreachable metric. Different routing
protocols employ this
rule at different times to control routing loops.

The router sends a poison reverse update to remove a route and place
it in holddown. This is done to avoid a routing loop

On Mon, Aug 17, 2009 at 4:16 PM, Abraham, Tharak
<tharakabraham_at_gmail.com>wrote:

> Anantha,
>
> Distance vector protocols are/should be implemented with split horizon and
> poison reverse !
> Both are different concepts, but gives the best when it works together.
>
> Please refer to Jeff Doyle Vol 1, read through pages 89 and 90 (pdf) with
> the examples.
>
>
> Best Regards,
> Tharak Abraham
>
>
>
> On Mon, Aug 17, 2009 at 9:27 PM, Anantha Subramanian Natarajan <
> anantha.natarajan_at_gravitant.com> wrote:
>
> > Hi All,
> >
> > I have a question on poison-reverse,to activate or de-activate poison
> > reverse for a distance vector routing protocols in cisco router,do we
> have
> > a
> > specific command for the same.Otherwise it is enabled,when we enable
> > split-horizon or it is enabled by default for all distance vector routing
> > protocol.I am sure missing something totally basic.Kindly help me to
> > understand the same.
> >
> > Thanks
> >
> > Regards
> > Anantha Subramanian Natarajan
> >
> >
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Received on Mon Aug 17 2009 - 16:57:24 ART