Re: Poison-reverse

Thanks Tharak for the comments .

Regards
Anantha Subramanian Natarajan

On Tue, Aug 18, 2009 at 6:22 AM, Abraham, Tharak <tharakabraham_at_gmail.com>wrote:

> In *RIP *both Split Horizon and Poison reverse are ON by default under the
> RIP process, and i dont know if there exist a command to turn the Poison
> reverse OFF
>
> When talking about *RIPng*, Split Horizon is ON by default whereas Poison
> reverse is OFF.
> We could call this a flexible implementation.
>
> The combination of the above helps in tackling routing loops efficiently
> though Poison reverse will create overhead in routing updates.(think
> bandwidth)
>
> I would still Request for more comments on this..-:)
>
>
>
>
> On Mon, Aug 17, 2009 at 11:07 PM, Anantha Subramanian Natarajan <
> anantha.natarajan_at_gravitant.com> wrote:
>
>> Hi Pramod,
>>
>> Thanks for the detailed explanation.Is that mean,poison reverse is inbuild
>> on the routing protocol when it is configured and there wouldn't be
>> provision to enable or disable it ?.My basic curiousness for this question
>> arrived from seeing a "poison-reverse"command under ipv6rip.I am
>> wondering,
>> is there a command related to poison-reverse on IPV4 distance vector
>> routing
>> protocol.
>>
>> Thanks
>>
>> Regards
>> Anantha Subramanian Natarajan
>>
>> On Mon, Aug 17, 2009 at 3:57 PM, Pramod G <learn02earn_at_gmail.com> wrote:
>>
>> > 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 Tue Aug 18 2009 - 07:13:58 ART