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CCNA Routing and Switching Portable Command Guide: Enhanced Interior Gateway Routing Protocol (EIGRP)

Sample Chapter is provided courtesy of Cisco Press.
Date: Jun 24, 2013.

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Chapter Description

The excerpt from The CCNA Routing and Switching Portable Command Guide summarizes all CCNA certification-level Cisco IOS® Software commands, keywords, command arguments, and associated prompts for topics related to the Enhanced Interior Gateway Routing Protocol (EIGRP).

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Configuration Example: EIGRP

Figure 8-1 illustrates the network topology for the configuration that follows, which shows how to configure EIGRP using the commands covered in this chapter.

Figure 8-1 Network Topology for EIGRP Configuration

Austin Router

`Austin>enable`	Moves to privileged mode.
`Austin#configure terminal`	Moves to global configuration mode.
`Austin(config)#interface serial 0/0/0`	Enters interface configuration mode.
`Austin(config-if)#ip address 172.16.20.1 255.255.255.0`	Assigns the IP address and netmask.
`Austin(config-if)#ip authentication mode eigrp 100 md5`	Enables MD5 authentication in EIGRP packets.
`Austin(config-if)#ip authentication key-chain eigrp 100 susannah`	Enables authentication of EIGRP packets. susannah is the name of the key chain.
`Austin(config-if)#no shutdown`	Enables the interface.
`Austin(config-if)#interface fastethernet 0/1`	Enters interface configuration mode.
`Austin(config-if)#ip address 172.16.10.1 255.255.255.0`	Assigns the IP address and netmask.
`Austin(config-if)#no shutdown`	Enables the interface.
`Austin(config-if)#router eigrp 100`	Enables EIGRP routing.
`Austin(config-router)#no auto-summary`	Disables auto-summarization.
`Austin(config-router)#eigrp log-neighbor-changes`	Changes with neighbors will be displayed.
`Austin(config-router)#network 172.16.0.0`	Advertises directly connected networks (classful address only).
`Austin(config-router)#passive interface fastethernet 0/1`	Prevents the sending of hello packets out the Fast Ethernet 0/1 interface. No neighbor adjacency will be formed.
`Austin(config-router)#key chain susannah`	Identifies a key chain name, which must match the name configured in interface configuration mode.
`Austin(config-keychain)#key 1`	Identifies the key number.
`Austin(config-keychain-key)#key-string tower`	Identifies the key string.
`Austin(config-keychain-key)#accept-lifetime 06:30:00 Apr 19 2013 infinite`	Specifies the period during which the key can be received.
`Austin(config-keychain-key)#send-lifetime 06:30:00 Apr 19 2013 09:45:00 Apr 19 2013`	Specifies the period during which the key can be sent.
`Austin(config-keychain-key)#exit`	Returns to global configuration mode.
`Austin(config)#exit`	Returns to privileged mode
`Austin#copy running-config startup-config`	Saves the configuration to NVRAM.

Houston Router

`Houston>enable`	Moves to privileged mode.
`Houston#configure terminal`	Moves to global configuration mode.
`Houston(config)#interface serial 0/0/1`	Enters interface configuration mode.
`Houston(config-if)#ip address 172.16.20.2 255.255.255.0`	Assigns the IP address and netmask.
`Houston(config-if)#ip authentication mode eigrp 100 md5`	Enables MD5 authentication in EIGRP packets.
`Houston(config-if)#ip authentication key-chain eigrp 100 eddie`	Enables authentication of EIGRP packets. eddie is the name of the key chain.
`Houston(config-if)#clock rate 56000`	Sets the clock rate.
`Houston(config-if)#no shutdown`	Enables the interface.
`Houston(config-if)#interface fastethernet 0/1`	Enters interface configuration mode.
`Houston(config-if)#ip address 172.16.30.1 255.255.255.0`	Assigns the IP address and netmask.
`Houston(config-if)#no shutdown`	Enables the interface.
`Houston(config-if)#router eigrp 100`	Enables EIGRP routing.
`Houston(config-router)#no auto-summary`	Disables auto-summarization.
`Houston(config-router)#eigrp log-neighbor-changes`	Changes with neighbors will be displayed.
`Houston(config-router)#network 172.16.0.0`	Advertises directly connected networks (classful address only).
`Houston(config-router)#passive interface fastethernet 0/1`	Prevents the sending of hello packets out the Fast Ethernet 0/1 interface. No neighbor adjacency will be formed.
`Houston(config-router)#key chain eddie`	Identifies a key chain name, which must match the name configured in interface configuration mode.
`Houston(config-keychain)#key 1`	Identifies the key number.
`Houston(config-keychain-key)#key-string tower`	Identifies the key string.
`Houston(config-keychain-key)#accept-lifetime 06:30:00 Apr 19 2013 infinite`	Specifies the period during which the key can be received.
`Houston(config-keychain-key)#send-lifetime 06:30:00 Apr 19 2013 09:45:00 Apr 19 2013`	Specifies the period during which the key can be sent.
`Houston(config-keychain-key)#exit`	Returns to global configuration mode.
`Houston(config)#exit`	Returns to privileged mode.
`Houston#copy running-config startup-config`	Saves the configuration to NVRAM.

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