From: mcaplan.cs@xxxxxxxxxxxxxxx
Date: Wed Apr 18 2001 - 09:13:47 GMT-3
Willy,
That is my observation wrt poison reverse. Thanks for your help
Cheers
Mark
> ----------
> From: Willy Schoots[SMTP:w.schoots@chello.nl]
> Reply To: w.schoots@chello.nl
> Sent: Dienstag, 17. April 2001 18:57
> To: mcaplan.cs@clearstream.com
> Subject: RE: RIP poison reverse
>
> Hi,
>
> As far as I know Cisco uses only Split Horizon with regular updates. Only
> in
> triggered updates it "uses" poison reverse. The RFCs discuss the
> possibility
> that you can use split horizon with and without poison reverse for the
> normal updates. I know that Nortel boxes have this option where you can
> configure split horizon or split horizon with poison reverse. The
> advantage
> of using poison reverse is faster loop avoidance, however it cost more
> bandwidth.
>
> Cheers,
>
> Willy Schoots
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> mcaplan.cs@clearstream.com
> Sent: Tuesday, April 17, 2001 9:33 AM
> To: ccielab@groupstudy.com
> Subject: RIP poison reverse
>
>
> Hi,
>
> I have been trying to see evidence of RIP's split horizon with poison
> reverse. I have the following set up
>
> subnet1 subnet2
> ----- ------
> | |
> R1 R2
> | |
> --------------------------------- subnet3
> |
> Solaris box
>
> Now when I run snoop on the Solaris box (or even debug ip rip from R1 and
> R2) I only see evidence of Split horizon. I see R2 advertise subnet 2 out
> onto subnet 3, and R1 advertise subnet 1 out onto subnet 3. I thought with
> poison reverse, R1 should advertise subnet 2 with a hop count of 16 out on
> subnet 3 interface, and R2 should advertise subnet 1 with a hop count of
> 16
> out on the subnet 3 interface. I dont see this poison reverse behavior on
> RIP, RIP2 or IGRP ? Can anyone explain. The only time I see any semblance
> of
> poison reverse, is when a router has purged a route, and it advertises it
> with a hop count of 16 until the flush timer expires.
>
> Any help is appreciated.
>
> Thanks
>
> Mark
>
>
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