From: David Siwula (DSiwula@xxxxxxxxxx)
Date: Tue Feb 19 2002 - 03:14:19 GMT-3
Right....that is kind of what I meant. Thanks for clarifying......
-----Original Message-----
From: Przemyslaw Karwasiecki [mailto:karwas@ifxcorp.com]
Sent: Monday, February 18, 2002 10:08 PM
To: David Siwula
Cc: 'ccielab@groupstudy.com'
Subject: Re: IGRP and /32 mask loopback
David,
Yes, you can distribute subnets of major networks.
What you cannot do, is to distribute subnets with different mask
then interface in the router runing IGRP.
Please see (r2 is IGRP only, R1 is redistributing OSPF into IGRP):
redistributing router:
---------------------
r1#sh ip ro
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS
inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is 10.10.1.3 to network 0.0.0.0
I 137.20.0.0/16 [100/8576] via 10.20.1.1, 00:01:03, Serial0.1
10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
C 10.10.0.0/16 is directly connected, Serial0.2
O 10.10.1.3/32 [110/64] via 10.10.1.3, 00:03:30, Serial0.2
O 10.10.1.5/32 [110/64] via 10.10.1.5, 00:03:30, Serial0.2
C 10.1.0.0/16 is directly connected, Ethernet0
C 10.20.0.0/16 is directly connected, Serial0.1
I 10.33.0.0/16 [100/12476] via 10.20.1.1, 00:01:04, Serial0.1
11.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
O 11.1.0.0/16 [110/74] via 10.10.1.5, 00:03:31, Serial0.2
I 11.0.0.0/8 is possibly down,
routing via 10.20.1.1, Serial0.1
C 192.168.1.0/24 is directly connected, Loopback0
O*E1 0.0.0.0/0 [110/564] via 10.10.1.3, 00:03:32, Serial0.2
and router 2 (IGRP only):
-------------------------
r2#sh ip ro
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS
inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
137.20.0.0/24 is subnetted, 1 subnets
C 137.20.20.0 is directly connected, Ethernet0
172.168.0.0/24 is subnetted, 1 subnets
C 172.168.32.0 is directly connected, Loopback0
10.0.0.0/16 is subnetted, 4 subnets
I 10.10.0.0 [100/10476] via 10.20.1.2, 00:00:09, Serial0
I 10.1.0.0 [100/8576] via 10.20.1.2, 00:00:09, Serial0
C 10.20.0.0 is directly connected, Serial0
I 10.33.0.0 [100/10476] via 10.20.1.2, 00:04:25, Serial0
I 11.0.0.0/8 is possibly down, routing via 10.20.1.2, Serial0
Przemek
On Mon, 2002-02-18 at 23:39, David Siwula wrote:
> I know that you can not redistribute a classless route into igrp. In
order
> to redistribute it, the route must be classfull. Meaning that it must be
a
> /8, /16, or a /24.
>
> Thanks...Dave
> -----Original Message-----
> From: Carolyn Camarda [mailto:ccamarda@bellsouth.net]
> Sent: Monday, February 18, 2002 8:19 PM
> To: ccielab@groupstudy.com
> Subject: Re: IGRP and /32 mask loopback
>
> I did some testing and could not get the IGRP process to send out a /32
> route. Nothing new, only classfull routes are sent out via IGRP.
>
> I wonder if it is related to redistribution. Could it receive a /32 route
> from another routing protocol but not forward it out? You would not
really
> be able to see anything because the redistributing protocol would own the
> route on the redistributing router.
>
> Doyle was no help.
>
>
>
>
>
> ----- Original Message -----
> From: "yakout esmat" <yesmat@iprimus.com.au>
> To: "Chua, Parry" <Parry.Chua@compaq.com>; "Carolyn Camarda"
> <ccamarda@bellsouth.net>; "Brett Lewis" <blewis@3net-uk.com>;
> <ccielab@groupstudy.com>
> Sent: Monday, February 18, 2002 9:49 PM
> Subject: RE: IGRP and /32 mask loopback
>
>
> > Right. But the way I look at it is, the receiving and sending interfaces
> are
> > supposed to be in the same network (/30), so if the loopback is not /30
as
> > well, the sending router will not send it at all.
> >
> > I might have it all wrong.
> >
> > -----Original Message-----
> > From: Chua, Parry [mailto:Parry.Chua@compaq.com]
> > Sent: Tuesday, February 19, 2002 2:40 PM
> > To: yakout esmat; Carolyn Camarda; Brett Lewis; ccielab@groupstudy.com
> > Subject: RE: IGRP and /32 mask loopback
> >
> >
> > I think what it mean is that, presume the receiving interface mask is
> > /30, if the receiving
> > update of the last two bits is not 00, then it is a host route and will
> > apply a /32 mask,
> > right ?
> >
> >
> > Parry Chua
> >
> > -----Original Message-----
> > From: yakout esmat [mailto:yesmat@iprimus.com.au]
> > Sent: Tuesday, February 19, 2002 11:16 AM
> > To: Carolyn Camarda; Brett Lewis; ccielab@groupstudy.com
> > Subject: RE: IGRP and /32 mask loopback
> >
> >
> > 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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