Ok, here are the relevant portions of the configs.
Router A:
ip subnet-zero
!
interface Ethernet0
ip address 10.1.1.33 255.255.255.224
no keepalive
!
interface Serial0
ip address 10.1.2.2 255.255.255.224
no fair-queue
!
router ospf 1
network 10.1.2.0 0.0.0.31 area 0
network 10.1.1.32 0.0.0.31 area 0
!
ip classless
Router B:
ip subnet-zero
!
interface Serial0
ip address 10.1.2.1 255.255.255.224
clockrate 500000
!
interface Serial1
ip address 10.1.3.1 255.255.255.0
!
router ospf 1
network 10.1.2.0 0.0.0.31 area 0
area 0 range 10.1.1.0 255.255.255.0
area 0 range 10.1.2.0 255.255.255.0
!
router igrp 1
redistribute ospf 1 metric 10000 1000 255 1 1500
passive-interface Serial0
network 10.0.0.0
default-metric 10000 1000 255 1 1500
!
ip classless
Here is the routing table for Router B:
RouterB#sho ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
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, * - candidate
default
Gateway of last resort is not set
10.0.0.0 is variably subnetted, 3 subnets, 2 masks
C 10.1.3.0 255.255.255.0 is directly connected, Serial1
C 10.1.2.0 255.255.255.224 is directly connected, Serial0
O 10.1.1.32 255.255.255.224 [110/74] via 10.1.2.2, 00:09:01, Serial0
And finally, Router C:
ip subnet-zero
!
interface Serial1
ip address 10.1.3.2 255.255.255.0
clockrate 500000
!
router igrp 1
network 10.0.0.0
!
ip classless
As I understand it, Router B would summarize 10.1.1.32/27 as 10.1.1.0/24 so
that it can be redistributed into IGRP. As you can see, 10.1.1.32/27 is in
the routing table, yet from debugging I can see that the summarized route is
not being added to the IGRP update, and therefore RouterC is never seeing
the route. I found a different way to make this work, but I wanted to
figure it out using the method in the book. So far, no luck.
Another oddity that I noticed that I need to check into: on RouterA, I had
to add a network statement for the 10.1.1.32/27 network or it wouldn't be
advertised. Why is this? I thought that the OSPF network statement
specified which interfaces were to participate in the OSPF process, not the
actual networks to be advertised (like in BGP.) It seems to me that the
10.1.1.32/27 network would be part of the Router LSA, with or without a
specific network statement.
Thanks,
John
> Need to see the remainder of your configs. I don't think you are using
the
> correct area range summary but without knowing your addressing scheme, I
> cannot say for sure.
>
>
> ----- Original Message -----
> From: John Neiberger <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Saturday, March 17, 2001 2:59 PM
> Subject: VLSM, OSPF, and redistribution into IGRP
>
>
> > I'm working through a scenario in the new Sybex CCIE study guide and I
> can't
> > get it to work, even using their suggested workaround. Here's the
> scenario:
> >
> > RouterA <--OSPF--> RouterB <--IGRP--> RouterC
> >
> > RouterA has two different /27 links, one of which is connected to
RouterB.
> > The connecting link is 10.1.2.0/27 and its other link is 10.1.1.32/27.
> >
> > The link between RouterB and RouterC is a /24, 10.1.3.0. The purpose
of
> the
> > scenario is to demonstrate that the /27 networks will not be
redistributed
> > in IGRP because the masks are different on each side of RouterB. To
> remedy
> > this problem, the book suggests summarizing the /27 networks as /24
which
> > would allow them to be redistributed into a classful protocol.
Following
> > the instructions, on RouterB I added:
> >
> > router ospf 1
> > area 0 range 10.1.1.0 255.255.255.0
> >
> > Supposedly, this would work but it does not. Closer to their example,
I
> > even tried "area 0 range 10.1.1.32 255.255.255.0". Am I doing it
> > incorrectly or is their suggestion wrong? I worked around this problem
by
> > creating a summarized static route on RouterB and then redistributing
> > static, but I wanted to make it work like in their example.
> >
> > So, redistribution gurus, what's the story? I quickly looked through
> > Doyle's book and I haven't seen this specific example yet.
> >
> > Any ideas?
> >
> > Many thanks,
> > John
> >
> >
> >
> >
> >
> > _______________________________________________________
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