Objectives

This challenge involves the setup of authenticated routing protocols with EIGRP. The objectives of this challenge are to:

• Define EIGRP.
• Apply MD5 authentication on an interface.
• Define the authentication key chain.

Commands

# config t
(config)# router eigrp 142
(config-router)# network 205.104.0.0
(config-router)# exit
(config)# int s0
(config-if)# ip address 205.118.116.6 255.255.255.224
(config-if)# ip authentication mode eigrp 142 md5
(config-if)# ip authentication key-chain eigrp 142 ann
(config-if)# exit
(config)# key chain ann
(config-keychain)# key 1
(config-keychain-key)# key-string hotel
(config-keychain-key)# exit

Example

# config t
(config)# router eigrp 142
(config-router)# ?
Router configuration commands:
  auto-summary         Enable automatic network number summarization
  default              Set a command to its defaults
  default-information  Control distribution of default information
  default-metric       Set metric of redistributed routes
  distance             Define an administrative distance
  distribute-list      Filter networks in routing updates
  eigrp                EIGRP specific commands
  exit                 Exit from routing protocol configuration mode
  help                 Description of the interactive help system
  maximum-paths        Forward packets over multiple paths
  metric               Modify IGRP routing metrics and parameters
  neighbor             Specify a neighbor router
  network              Enable routing on an IP network
  no                   Negate a command or set its defaults
  offset-list          Add or subtract offset from IGRP or RIP metrics
  passive-interface    Suppress routing updates on an interface
  redistribute         Redistribute information from another routing protocol
  timers               Adjust routing timers
  traffic-share        How to compute traffic share over alternate paths
  variance             Control load balancing variance
(config-router)# network 205.104.0.0
(config-router)# exit
(config)# int s0
(config-if)# ip address 205.118.116.6 255.255.255.224
(config-if)# ip authen ?
  key-chain  key-chain
  mode       mode
(config-if)# ip authen mode ?
  eigrp  Enhanced Interior Gateway Routing Protocol (EIGRP)
(config-if)# ip authen mode e ?
  <1-65535>  Autonomous system number
(config-if)# ip authen mode e 142 ?
  md5  Keyed message digest
(config-if)# ip authentication mode eigrp 142 md5
(config-if)# ip authentication key ?
  eigrp  Enhanced Interior Gateway Routing Protocol (EIGRP)
(config-if)# ip authentication key eigrp ?
  <1-65535>  Autonomous system number
(config-if)# ip ip authentication key 142 ?
  WORD  name of key-chain
(config-if)# ip ip authentication key ann ?
  
(config-if)# ip authentication key-chain eigrp 142 ann
(config-if)# exit
(config)# key ?
  chain       Key-chain management
  config-key  Set a private configuration key
(config)# key chain ?
  WORD  Key-chain name
(config)# key chain ann ?
  
(config)# key chain ann
(config-keychain)# ?
Key-chain configuration commands:
  default  Set a command to its defaults
  exit     Exit from key-chain configuration mode
  key      Configure a key
  no       Negate a command or set its defaults
(config-keychain)# key ?
  <0-2147483647>  Key identifier
(config-keychain)# key 1
(config-keychain-key)# ?
Key-chain key configuration commands:
  accept-lifetime  Set accept lifetime of key
  default          Set a command to its defaults
  exit             Exit from key-chain key configuration mode
  key-string       Set key string
  no               Negate a command or set its defaults
  send-lifetime    Set send lifetime of key
(config-keychain-key)# key-string ?
  <0-7>  Encryption type (0 to disable encryption, 7 for proprietary)
  LINE   The key
(config-keychain-key)# key-string hotel
(config-keychain-key)# exit