Cisco 7604 Configuration Guide - Page 170
Configuring Summary Aggregate Addresses, Disabling EIGRP Split Horizon, summary-address
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Configuring EIGRP Chapter 8 Configuring IP Routing and DHCP Services To disable automatic router summarization, enter the following command in router configuration mode for the EIGRP routing process: hostname(config-router)# no auto-summary Note Automatic summary addresses have an adminstrative distance of 5. You cannot configure this value. Configuring Summary Aggregate Addresses You can configure a summary addresses on a per-interface basis. You need to manually define summary addresses if you want to create summary addresses that do not occur at a network number boundary or if you want to use summary addresses on a FWSM with automatic route summarization disabled. If any more specific routes are in the routing table, EIGRP will advertise the summary address out the interface with a metric equal to the minimum of all more specific routes. To create a summary address, perform the following steps: Step 1 Step 2 Enter interface configuration mode for the interface on which you are creating a summary address by entering the following command: hostname(config)# interface phy_if Create the summary address by entering the following command: hostname(config-if)# summary-address eigrp as-num address mask [distance] By default, EIGRP summary addresses that you define have an administrative distance of 5. You can change this value by specifying the optional distance argument in the summary-address command. 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. To disable EIGRP split-horizon, perform the following steps: Step 1 Enter interface configuration mode for the interface on which you are disabling split horizon by entering the following command: hostname(config)# interface phy_if 8-28 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM OL-20748-01
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