Cisco Systems Disabling Automatic Route Summarization, Configuring Default Information in EIGRP

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Cisco ASA 5500 Series Configuration Guide using ASDM
Chapter30 Configuring EIGRP
Customizing EIGRP
Step8 In the Hold Time field, specify the hold time, in seconds.
Valid values range from 1 to 65535 seconds. The default value is 15 seconds.
Step9 Click OK.
Disabling Automatic Route Summarization
Automatic route summarization is enabled by default. The EIGRP routing process summarizes on
network number boundaries. This 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 EIGRP, the EIGRP 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 EIGRP, 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 creating the conflicting summary
addresses.
To disable automatic route summarization in ASDM, perform the following steps:
Step1 In the main ASDM window, choose Configuration > Device Setup > Routing > EIGRP > Setup.
The EIGRP Setup pane appears.
Step2 Check the Enable EIGRP routing check box.
Step3 Click the Process Instance tab.
Step4 Click Advanced.
Step5 In the Summary area, uncheck the Auto-Summary check box.
Note This setting is enabled by default.
Step6 Click OK.
Configuring Default Information in EIGRP
You can control the sending and receiving of default route information in EIGRP updates. By default,
default routes are sent and accepted. Configuring the ASA to disallow default information to be received
causes the candidate default route bit to be blocked on received routes. Configuring the ASA to disallow
default information to be sent disables the setting of the default route bit in advertised routes.
In ASDM, the Default Information pane displays a table of rules for controlling the sending and
receiving of default route information in EIGRP updates. You can have one in and one out rule for each
EIGRP routing process (only one process is currently supported). By default, default routes are sent and
accepted.
To restrict or disable the sending and receiving of default route information, perform the following steps: