Configuring The Eigrp Hello Interval And Hold Time; Disabling Automatic Route Summarization - Cisco 7604 Configuration Manual

Chapter 8 Configuring IP Routing and DHCP Services
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You must specify the EIGRP metric values in the redistribute command if you do not have a
default-metric command in the EIGRP router configuration.

Configuring the EIGRP Hello Interval and Hold Time

The FWSM periodically sends hello packets to discover neighbors and to learn when neighbors become
unreachable or inoperative. By default, hello packets are sent every 5 seconds.
The hello packet advertises the FWSM hold time. The hold time indicates to EIGRP neighbors the length
of time the neighbor should consider the FWSM reachable. If the neighbor does not receive a hello
packet within the advertised hold time, then the FWSM is considered unreachable. By default, the
advertised hold time is 15 seconds (three times the hello interval).
Both the hello interval and the advertised hold time are configured on a per-interface basis. We
recommend setting the hold time to be at minimum three times the hello interval.
To configure the hello interval and advertised hold time, perform the following steps:
Enter interface configuration mode for the interface on which you are configuring hello interval or
Step 1
advertised hold time by entering the following command:
hostname(config)# interface phy_if
To change the hello interval, enter the following command:
Step 2
hostname(config)# hello-interval eigrp as-num seconds
To change the hold time, enter the following command:
Step 3
hostname(config)# hold-time eigrp as-num seconds

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 non-contiguous 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.
Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM
OL-20748-01
To redistribute static routes into the EIGRP routing process, enter the following command:
hostname(config-router): redistribute static [metric bandwidth delay reliability
loading mtu] [route-map map_name]
To redistribute routes from an OSPF routing process into the EIGRP routing process, enter the
following command:
hostname(config-router): redistribute ospf pid [match {internal | external [1 | 2] |
nssa-external [1 | 2]}] [metric bandwidth delay reliability loading mtu] [route-map
map_name]
Configuring EIGRP
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