Cisco ASA 5505 Configuration Manual page 414

Customizing RIP
In the Receive Version area, check the Override global receive version check box to specify the RIP
Step 6
version accepted by the interface. If a RIP updated from an unsupported version of RIP is received by
the interface, it is dropped. Choose one of from the following:
•
•
•
Click Apply.
Step 7
Configuring Route Summarization
RIP Version 1 always uses automatic route summarization. You cannot disable this feature for RIP
Note
Version 1. RIP Version 2 uses automatic route summarization by default.
The RIP routing process summarizes on network number boundaries, which can cause routing problems
if you have noncontiguous networks.
For example, if you have a router with the networks 192.168.1.0, 192.168.2.0, and 192.168.3.0
connected to it, and those networks all participate in RIP, the RIP routing process creates the summary
address 192.168.0.0 for those routes. If an additional router is added to the network with the networks
192.168.10.0 and 192.168.11.0, and those networks participate in RIP, they will also be summarized as
192.168.0.0. To prevent the possibility of traffic being routed to the wrong location, you should disable
automatic route summarization on the routers that are creating conflicting summary addresses.
Because RIP Version 1 always uses automatic route summarization, and RIP Version 2 always uses
automatic route summarization by default, when configuring automatic route summarization, you only
need to disable it.
In ASDM, you can enable or disable automatic route summarization in a RIP process using the following
steps:
In the main ASDM window, choose Configuration > Device Setup > Routing > RIP > Setup.
Step 1
Check the Enable RIP routing check box, and click Apply.
Step 2
Check the Enable Auto-Summarization check box.
Step 3
Uncheck this check box to disable automatic route summarization. Check this check box to reenable
automatic route summarization. RIP Version 1 always uses automatic summarization. You cannot disable
automatic route summarization for RIP Version 1. If you are using RIP Version 2, you can turn off
automatic route summarization by unchecking this check box. Disable automatic route summarization if
you must perform routing between disconnected subnets. When automatic route summarization is
disabled, subnets are advertised.
Click Apply.
Step 4
Cisco ASA 5500 Series Configuration Guide using ASDM
22-8
Version 1
Version 2
Version 1 & 2
Unchecking this check box restores the global setting.
Chapter 22 Configuring RIP
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