Cisco ASA 5505 - Manual (Page 487)

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Cisco ASA 5500 Series Configuration Guide using the CLI
Chapter 25 Configuring RIP
Customizing RIP
Configuring Route Summarization
Note RIP Version 1 always uses automatic route summarization. You cannot disable this feature for RIP
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.
To disable automatic route summarization, enter the following command:
Detailed Steps
rip send version {[1] [2]}
Example:
hostname(config-if)# rip send version 1
Specifies the version of RIP to use when sending RIP updates out
of the interface.
In this example, Version 1 is selected.
rip receive version {[1] [2]}
Example:
hostname(config-if)# rip receive version 2
Specifies the version of RIP advertisements permitted to be
received by an interface.
In this example, Version 2 is selected.
RIP updates received on the interface that do not match the
allowed version are dropped.
Command Purpose
Command Purpose
Step 1 router rip
Example:
hostname(config)# router rip
Enables the RIP routing process and places you in router
configuration mode.
Step 2 no auto-summarize
Example:
hostname(config-router):# no
auto-summarize
Disables automatic route summarization.