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Configuring EIGRP
EIGRP Configuration Task List
IPC-266
Cisco IOS IP Configuration Guide
Each key has its own key identifier (specified with the key number key chain configuration command),
which is stored locally. The combination of the key identifier and the interface associated with the
message uniquely identifies the authentication algorithm and MD5 authentication key in use.
You can configure multiple keys with lifetimes. Only one authentication packet is sent, regardless of
how many valid keys exist. The software examines the key numbers in order from lowest to highest, and
uses the first valid key it encounters. Note that the router needs to know the time. Refer to the Network
Time Protocol (NTP) and calendar commands in the “Performing Basic System Management” chapter
of the Cisco IOS Configuration Fundamentals Configuration Guide.
For an example of route authentication, see the section “Route Authentication Example” at the end of
this chapter.
Configuring EIGRP Protocol-Independent Parameters
EIGRP works with AppleTalk, IP, and IPX. The bulk of this chapter describes EIGRP. However, this
section describes EIGRP features that work for AppleTalk, IP, and IPX. To configure such
protocol-independent parameters, perform one or more of the tasks in the following sections:
• Adjusting the Interval Between Hello Packets and the Hold Time
• Disabling Split Horizon
For more protocol-independent features that work with EIGRP, see the chapter “Configuring IP Routing
Protocol-Independent Features” in this document.
Adjusting the Interval Between Hello Packets and the Hold Time
You can adjust the interval between hello packets and the hold time.
Routing devices periodically send hello packets to each other to dynamically learn of other routers on
their directly attached networks. This information is used to discover neighbors and to learn when
neighbors become unreachable or inoperative.
Step 3
Router(config-if)# ip authentication key-chain
eigrp autonomous-system key-chain
Enables authentication of EIGRP packets.
Step 4
Router(config-if)# exit
Router(config)#
Exits to global configuration mode.
Step 5
Router(config)# key chain name-of-chain
Identifies a key chain. (Match the name configured in
Step 1.)
Step 6
Router(config-keychain)# key number
In keychain configuration mode, identifies the key
number.
Step 7
Router(config-keychain-key)# key-string text
In keychain key configuration mode, identifies the key
string.
Step 8
Router(config-keychain-key)# accept-lifetime
start-time {infinite | end-time | duration
seconds}
Optionally specifies the time period during which the key
can be received.
Step 9
Router(config-keychain-key)# send-lifetime
start-time {infinite | end-time | duration
seconds}
Optionally specifies the time period during which the key
can be sent.
Command Purpose