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Cisco ASA 5500 Series Configuration Guide using ASDM
Chapter 30 Configuring EIGRP
Customizing EIGRP
Step 1 In the main ASDM window, choose Configuration > Device Setup > Routing > EIGRP > Setup.
The main EIGRP Setup pane appears.
Step 2 Check the Enable EIGRP routing check box.
Step 3 Click OK.
Step 4 Do one of the following:
• Click Add to create a new entry.
• To edit an entry, double-click the entry in the table or select an entry in the table and click Edit.
The Add Default Information or Edit Default Information dialog box appears for that entry. The
EIGRP AS number is automatically selected in the EIGRP field.
Step 5 In the Direction field, choose the direction for the rule from the following options:
• in—The rule filters default route information from incoming EIGRP updates.
• out—The rule filters default route information from outgoing EIGRP updates.
You can have one in rule and one out rule for each EIGRP process.
Step 6 Add network rules to the network rule table. The network rules define which networks are allowed and
which are not when receiving or sending default route information. Repeat the following steps for each
network rule you are adding to the default information filter rule.
a. Click Add to add a network rule. Double-click an existing network rule to edit the rule.
b. In the Action field, click Permit to allow the network or Deny to block the network.
c. Enter the IP address and network mask of the network being permitted or denied by the rule in the
IP Address and Network Mask fields.
To deny all default route information from being accepted or sent, enter 0.0.0.0 as the network
address and choose 0.0.0.0 as the network mask.
d. Click OK to add the specified network rule to the default information filter rule.
Step 7 Click OK to accept the default information filter rule.
Disabling EIGRP Split Horizon
Split horizon controls the sending of EIGRP update and query packets. When split horizon is enabled on
an interface, update and query packets are not sent for destinations for which this interface is the next
hop. Controlling update and query packets in this manner reduces the possibility of routing loops.
By default, split horizon is enabled on all interfaces.
Split horizon blocks route information from being advertised by a router out of any interface from which
that information originated. This behavior usually optimizes communications among multiple routing
devices, particularly when links are broken. However, with nonbroadcast networks, there may be
situations where this behavior is not desired. For these situations, including networks in which you have
EIGRP configured, you may want to disable split horizon.
If you disable split horizon on an interface, you must disable it for all routers and access servers on that
interface.