Re: R: RIP poison reverse

From: Michel GASPARD (mgaspard@xxxxxxxxx)
Date: Tue Apr 17 2001 - 10:04:30 GMT-3


   
Mark,

http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/np1_c/1c
prt1/1crip.htm#xtocid1677311

http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/np1_r/1r
prt1/1rrip.htm#xtocid112459

will give you useful info.

Regards,

Michel

mcaplan.cs@clearstream.com wrote:
>
> Hi,
>
> Has anybody got any advice about the problem below. ie - why dont I see
> evidence of poison reverse in RIP, RIP2 and IGRP. I thought split horizon
> with poison reverse meant RIP would send out route updates out an interface
> with a hop count of 16 if it learnt the route via that interface. But I dont
> see it when I do a snoop or debug ip rip - I just see evidence of split
> horizon ?
>
> Thanks
>
> Mark
>
> > ----------
> > From: mcaplan.cs@clearstream.com[SMTP:mcaplan.cs@clearstream.com]
> > Reply To: mcaplan.cs@clearstream.com
> > Sent: Dienstag, 17. April 2001 09:33
> > 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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