>Hi,
>
>Does anyone have any good URLs/articles of rules and procedures to building
>the routing tables of RIP, IGRP (RIP and IGRP should be the same?) and OSPF?
>'Coz I am reading the routing tables of 2 routers running IGRP and I
>couldn't build the same routing tables as the routers did.
Hint for your immediate problem:
Don't use IP unnumbered and I think things will clarify. Think about
how the IOS sees IP unnumbered. It needs an address somewhere, just
so it can internally send things to it.
More general -- the principles of route selection are defined in RFC
1812. I go through them in more detail on a multi-vendor basis in my
book, Designing Routing and Switching Architectures for Enterprise
Networks. For Cisco specific nuances, see my white paper at
Certification Zone, Routing Principles and IOS Implementation.
>
>Your helping is needed. Thanks.
>
>Dave
>========================================
>
>Here is the question. R1 is connected to R2 with a serial link.
>==>R1# sh run
>interface Ethernet0
> ip address 171.68.178.196 255.255.255.192
>
>interface Serial0
> ip unnumbered Ethernet0
> clock rate 20000
>
>router igrp0
> network 171.68.0.0
>
>==>R2# sh run
>interface Ethernet0
> ip address 172.68.178.196 255.255.255.192
>
>interface Serial0
> ip unnumbered Ethernet0
>
>router igrp0
> network 172.68.0.0
>
>==>R2# sh ip route
>C 172.68.0.0/16 is directly connected, Ethernet0
> 171.68.0.0/16 is variably subnetted, 2 subnets, 2 masks
>I 171.68.178.192/32 [100/8576] via 171.68.178.196, 00:00:49, Serial0
>I 171.68.0.0/16 [100/8576] via 171.68.178.196, 00:00:49, Serial0
>
>I couldn't figure how the below entry comes in:
>I 171.68.178.192/32 [100/8576] via 171.68.178.196, 00:00:49, Serial0
>
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