RE: Intersting Question on RIP metric

From: Bauer, Rick (BAUERR@xxxxxxxxxxx)
Date: Fri Aug 23 2002 - 11:48:00 GMT-3

   
Never looked at it from there, but it must be a mistake. You can only add to
the metric.

I thought that you might have been setting the offset on r1, my suggestion
was to change that from to 2. Sorry, if I miss-interpreted what you were
doing.

I don't think that it would be feasible to subtract from the metric due to
the limited network diameter of rip/igrp. You could end up black holing your
self pretty easily. Think about it this way. You would advertise the altered
route to it's up stream neighbors with the new metric but the subnets that
were advertised from the up stream routers would be unreachable on routers
that they could send traffic to. Make sense?

Offset lists are useful when you have redundancy and want to choose one link
as the primary or if you want to block certain network from being used in
areas of you network.

Rick, #9482

-----Original Message-----
From: Colin Barber [mailto:Colin.Barber@telewest.co.uk]
Sent: Friday, August 23, 2002 10:09 AM
To: Bauer, Rick; ccielab@groupstudy.com
Subject: RE: Intersting Question on RIP metric

The output below shows the description of offset-list from the context
sensitive help. Also if the route already has a metric of 5 on r1 then
adding an offset of 2 to outgoing advertisements will make the route have a
metric of 8 on r2.

router4(config)#router rip
router4(config-router)#?
Router configuration commands:
  offset-list Add or subtract offset from IGRP or RIP metrics

Colin
-----Original Message-----
From: Bauer, Rick [mailto:BAUERR@toysrus.com]
Sent: 23 August 2002 13:11
To: 'Colin Barber'
Subject: RE: Intersting Question on RIP metric

You can set an offset-list out on r1 with a metric of 2 this will give r2
the routes with metric of 3. I have never seen what you are talking about
with the help. From my experience it has always indicated the amount to add
to the metric.

HTH.....

Rick, #9482

-----Original Message-----
From: Colin Barber [mailto:Colin.Barber@telewest.co.uk]
Sent: Friday, August 23, 2002 7:24 AM
To: ccielab@groupstudy.com
Subject: RE: Intersting Question on RIP metric

All the documentation I have found on the Cisco site states that an offset
list adds to the metric. There is no mention of subtraction apart from the
context sensitive help which I guess is incorrect.

Colin

-----Original Message-----
From: thunai@netsol.co.in [mailto:thunai@netsol.co.in]
Sent: 23 August 2002 09:26
To: asimmegawatt@yahoo.com; thunai@netsol.co.in; ccielab@groupstudy.com
Subject: RE: Intersting Question on RIP metric

It just adds the metric . I want to subract the metric and install in the
local router table

> -----Original Message-----
> From: Asim Khan [SMTP:asimmegawatt@yahoo.com]
> Sent: Friday, August 23, 2002 1:39 PM
> To: thunai@netsol.co.in; ccielab@groupstudy.com
> Subject: Re: Intersting Question on RIP metric
>
> Thunai,
>
> You can do the following configuratin on R2.
>
> R1(config)#access-list 1 permit <address> <mask>
>
> where <address> is the address whose metric is to be
> manipulated.
>
> R1(config)#router rip
> R1(config-router)#network x.x.x.x
> R1(config-router)#offset-list 1 in 3 <int-name>
>
> where 3 is the metric.
>
> Regards.
>
> Asim Khan
>
>
> --- thunai@netsol.co.in wrote:
> > Hai Group ,
> > Two routers r1-r2 running RIP , r1 is giving some
> > routes to r2
> > with a metric of 5 but i want r2 to install that
> > routes with a metric of 3
> > . I was wondering how to use offset-list command to
> > subract metric . If u
> > look at the description of offset-list command its
> > says u can add / sub . If
> > u use offset in / out it simply add the metric .Can
> > some throw some light
> > on this..
> >
> >
> > Thanks in advance
> > thunai
> >

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