From: chahal (bob.chahal@xxxxxxxxxxxx)
Date: Wed Jan 17 2001 - 13:56:50 GMT-3
Yep, that's the conclusion I came up to i.e. you don't get the full access
to the addresses within the subnets.
What I did was to use static routes pointing to the interface but kept the
mask on ethernet 1 the same (see below). Static routes pointing to
interfaces are considered conneted and are redistributed as part of the
routing process. It's not Doyle's answer but it made me think a little i.e.
I didn't use a redistribute static command. It's been a while since I did
this and I'm refering to notes but I think it worked. Doyle never said not
to use static routes but then again it's not his answer.
Router B
int e0
ip add 172.16.1.146 255.255.255.240
!
int e1
ip add 172.16.1.98 255.255.255.224
router rip
redistribute igrp 1 metric 1
passive-interface ethernet 0
network 172.16.0.0
!
router igrp 1
redistribute rip metric 10000 1000 255 1 1500
passive-interface ethernet1
network 172.16.0.0
!
ip route 172.16.1.128 255.255.255.224 e1
ip route 172.16.1.160 255.255.255.224 e1
ip route 172.16.1.192 255.255.255.224 e1
ip route 172.16.1.224 255.255.255.224 e1
ip route 172.16.1.32 255.255.255.240 e0
ip route 172.16.1.48 255.255.255.240 e0
ip route 172.16.1.64 255.255.255.240 e0
ip route 172.16.1.80 255.255.255.240 e0
ip route 172.16.1.96 255.255.255.240 e0
ip route 172.16.1.112 255.255.255.240 e0
ip route 172.16.1.128 255.255.255.240 e0
ip route 172.16.1.144 255.255.255.240 e0
----- Original Message -----
From: massimo aronica <m_aronica@hotmail.com>
To: <ccielab@groupstudy.com>
Sent: Tuesday, January 16, 2001 9:28 PM
Subject: Re: Jeff doyle errata??
> In fact Bob, it is happening also in my lab... with the exception
(mistyped
> I think) that
>
> "The routing table on A will see the networks as 172.16.2.32/28 .64/28
> .128/28 and .96/28 so there is some loss of address/network detail."
>
> This is a trick to fool a router about the classful rule "drop if same
major
> but different subnet"... but I wonder what solution is this (Jeff ??).
What
> about those guys working behind router C with their IP adds 172.16.2.49 or
> .50 or .81 etc ... we've lost them on the way.
>
> Max
>
> >From: "chahal" <bob.chahal@ntlworld.com>
> >Reply-To: "chahal" <bob.chahal@ntlworld.com>
> >To: "David FAHED" <dfahed@outremer.com>, <ccielab@groupstudy.com>
> >Subject: Re: Jeff doyle errata??
> >Date: Mon, 15 Jan 2001 22:49:34 -0000
> >
> >I seem to remember this one. What I found was that Router B accepts the
> >routing info from Router C as /28 networks (i.e. 172.16.2.32/28 .64/28
> >.128/28 and .96/28) and redistributes these into IGRP. The ethernet
> >interface of Router C is still configured with an address from
> >172.16.1.96/27. Router C will send rip updates of its connected networks
> >but
> >Router B will interpret tham as /28 networks.
> >
> >The routing table on A will see the networks as 172.16.2.32/27 .64/27
> >.128/27 and .96/27 so there is some loss of address/network detail.
> >
> >----- Original Message -----
> >From: David FAHED <dfahed@outremer.com>
> >To: <ccielab@groupstudy.com>
> >Sent: Monday, January 15, 2001 4:14 PM
> >Subject: Jeff doyle errata??
> >
> >
> > > I wonder if I missed something really important about redistribution
> > > with classful protocol or if Jeff Doyle book have a big mistake:
> > > Page 739 exercises:
> > >
> > > Router A is Running IGRP and Router C is Running RIPV1. Write a
> > > configuration for router B that will provide full connectivity for all
> > > subnets:
> > >
> > > 172.16.1.160/28 172.16.1.144/28
> > > 172.16.1.224/28--RouterA---------e0-RouterB
> > > 172.16.1.128/28 e1
> > > 172.16.1.192/28 /
> > > /
> > > 172.16.1.96/27
> > > /
> > > /
> > > RouterC
> > > 172.16.2.32/27
> > > 172.16.2.64/27
> > > 172.16.2.128/27
> > >
> > > Page 958 solution of chapter 11 configuration :
> > >
> > > The solution is to use a 28 bit mask on RTB eth1 interface.
> > > The config of RTB:
> > > int e0
> > > ip add 172.16.1.146 255.255.255.240
> > >
> > > int e1
> > > ip add 172.16.1.98 255.255.255.240
> > >
> > > router rip
> > > redis igrp 1 metric 1
> > > pass int e0
> > > net 172.16.0.0
> > >
> > > router igrp 1
> > > redistribute rip met 10000 100 255 1 1500
> > > pass inter e1
> > > net 172.16.0.0
> > >
> > > My problem is with this config :
> > > RTC will see all the route (of IGRP domain /28) BUT RTA will see only
> > > one route 172.16.1.96/28 (of rip domain).
> > >
> > > Any help will be welcome!!!
> > >
> > >
> > >
> > >
> > >
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