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The
show interface
commands
from RouterA (see RouterA#show interface serial 1
command output) and RouterC (see RouterC#show interface
serial 1 command output) show that IP unnumbered is now in use on both
serial interfaces.
RIP and IGRP Behave the Same
The rules governing the successful
configuration of IP unnumbered that were given in the previous section apply to RIP V1 and IGRP equally. When properly configured, both
protocols behave in the same manner. All of the material presented in the
following scenario, which shows the proper configuration of IP unnumbered
using RIP, applies to IGRP as well.
Improper configuration of IP unnumbered
causes both RIP V1 and IGRP to lose IP connectivity for the misconfigured
subnets. By applying the concepts presented in this scenario, you should
be able to understand what is going wrong when you are faced with a
network in which IGRP has been configured with an improper use of IP
unnumbered.
This section is broken into the following
three scenarios:
RIP with IP unnumbered configured
properly.
This section shows IP unnumbered
working as intended and provides insights into proving that it is
working as intended.
RIP with IP unnumbered configured
improperly --- a different subnet mask was used.
This section shows IP unnumbered not
working as intended because an improper subnet mask has been
applied. It also provides some insights into proving that it is
not working as intended.
RIP with IP unnumbered configured
improperly --- a different subnet mask and a different major net
were used.
This section combines the use of
different major networks with a misconfiguration caused by using a
subnet mask on one of the networks. It shows how IP unnumbered
works with different major nets as well as how the use of a subnet
masked major net can cause problems in some configurations.
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