From: yakout esmat (yesmat@xxxxxxxxxxxxxx)
Date: Tue Feb 19 2002 - 00:16:28 GMT-3
I read this article before, and that's what's puzzling me.
Based on the "Sending Updates" section of this article, IGRP router will not
send-out updates to another IGRP router containing /32 host subnets, because
it will compare the loopback mask against its source interface mask (In this
case the serial intf), and if they are not identical (which they are not of
course) then it will drop the host network and will not advertise it.
THEN when you read the other section "Receiving Updates", """If the answer
is Yes then Router 2 applies the mask of the interface that received the
update. If the advertised network has a host bit set in the host portion of
the update, Router 2 applies the host mask (/32). In the case of RIP, it
continues to advertise the /32 route to the subsequent router, but IGRP
doesn't."""
There is a conflict here, How can Router2 receive a network with a bit set
in the host portion (this contradists the Sending Rule)
Still confusing...
Yakout
-----Original Message-----
From: Carolyn Camarda [mailto:ccamarda@bellsouth.net]
Sent: Tuesday, February 19, 2002 2:02 PM
To: yakout esmat; Brett Lewis; ccielab@groupstudy.com
Subject: Re: IGRP and /32 mask loopback
Check the archives...
http://www.cisco.com/warp/public/105/54.html
IGRP understands it, accepts it, but won't advertise it.
----- Original Message -----
From: "yakout esmat" <yesmat@iprimus.com.au>
To: "Brett Lewis" <blewis@3net-uk.com>
Cc: <ccielab@groupstudy.com>
Sent: Monday, February 18, 2002 8:17 PM
Subject: RE: IGRP and /32 mask loopback
> It is basic config, nothing special. RIP surely understands host networks
>
>
>
> -----Original Message-----
> From: Brett Lewis [mailto:blewis@3net-uk.com]
> Sent: Tuesday, February 19, 2002 1:28 AM
> To: yakout esmat
> Subject: Re: IGRP and /32 mask loopback
>
>
> I could not get RIP V1 to accept a /32 mask on a loopback. Can you send me
> your config.
>
>
> Many Thanks
> Brett
> ----- Original Message -----
> From: "yakout esmat" <yesmat@iprimus.com.au>
> To: <ccielab@groupstudy.com>
> Cc: <nobody@groupstudy.com>
> Sent: Monday, February 18, 2002 10:53 AM
> Subject: IGRP and /32 mask loopback
>
>
> > Hi all,
> >
> > I have a problem advertising host addresses of loopbacks (with /32 mask)
> > under IGRP. I don't have this problem with RIP V1.0.
> >
> > Does IGRP understand host networks like RIP? or it behaves differently ?
> >
> > Appreciate your input.
> >
> > Cheers
> >
> > Yakout
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