you've chosen a very difficult redistribution exercise - redistributing from
a smaller to larger prefix.
Assuming you know how to redistribute generally (it looks like you're
already a CCIE), you know that the summary-address in OSPF summarizes
inbound into OSPF, and is advertised by OSPF at an ASBR.
Issues that you face:
#1. The IGRP process runs on 137.20.0.0 and you probably already know that
all network masks on attached IGRP interfaces need to be uniform. You have
two diffferent masks on R5 - /24 and /28 for the same classful network.
#2. You really don't have any routes to redistribute since the networks are
both directly attached to both routing protocols on R5. Consider using
another network on the end of R1, perhaps on a loopback interface, to
redistribute. However, you run into the issue on R5 of variable length
masks, which will cause you grief in redistibution into IGRP
#3. Redistribution from a smaller to larger prefix is always difficult -
the only two solutions that I can think of are:
a. Creating 4 static routes (.0, .64, .128, .192) to null0 with a high
administrative distance and redistributing static into IGRP
b. Creating 4 summary-addresses in OSPF and doing the same.
Good luck, my friend
----- Original Message -----
From: "CCIE Loh"
To:
Sent: Tuesday, September 11, 2001 7:39 AM
Subject: Redistribution OSPF and IGRP [7:19409]
> Hi,
> Can someone enlighten me on the following
> redistribution scenario? If I will to use
> "summary-address" what are the statements that I
> need? Thanks in advance.
>
>
> R1 -------------R5--------------R4
>
> R1
> running OSPF
> IP address is 137.20.25.1/24
>
> R5
> Running OSPF and IGRP
> IP address is 137.20.25.5/24 and 137.20.200.17/28
>
> R4
> running IGRP
> IP address is 137.20.200.18/28
>
>
> The "summary-address" command in R5 is
>
> router ospf 10
> summary-address 137.20.25.0 255.255.255.240
>
> But when I do a "show ip ospf summary" the metric is
> very large. I suspect that it is because of this large
> metric that the route did not get redistributed to the
> IGRP domain. Please advise. Thanks.
>
>
> R5#show ip ospf summary
>
> OSPF Process 10, Summary-address
>
> 137.20.25.0/255.255.255.240 Metric 16777215, Type 0,
> Tag 0
> R5#
>
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