EIGRP Named Mode Configuration

Since IOS 15, EIGRP has a new method of configuration called named mode EIGRP.  With the “classic” version of EIGRP that we used before IOS 15 we configured EIGRP globally and some other things (like authentication) on the interfaces. With named mode EIGRP, we do everything globally.

If you try to configure EIGRP on a IOS 15.x router you will see this:

R1(config)#router eigrp ?
  <1-65535>  Autonomous System
  WORD       EIGRP Virtual-Instance Name

Instead of an AS number we can also choose a name. Let’s try this, I’ll use two routers for this demonstration:

EIGRP R1 R2Let’s start with R1:

R1(config)#router eigrp MY_NAME
Router configuration commands:
  address-family  Enter Address Family command mode
  default         Set a command to its defaults
  exit            Exit from routing protocol configuration mode
  no              Negate a command or set its defaults
  service-family  Enter Service Family command mode
  shutdown        Shutdown this instance of EIGRP

The configuration is now done using an address-family. Let’s select it:

R1(config-router)#address-family ?
  ipv4  Address family IPv4
  ipv6  Address family IPv6

EIGRP named mode covers both IPv4 and IPv6. Let’s try IPv4:

R1(config-router)#address-family ipv4 autonomous-system 12

This is where I configure everything. For example advertising a network:


Everything that used to be configured on the interface is now under the same global configuration:

R1(config-router-af)#af-interface FastEthernet 0/0
Address Family Interfaces configuration commands:
  authentication      authentication subcommands
  bandwidth-percent   Set percentage of bandwidth percentage limit
  bfd                 Enable Bidirectional Forwarding Detection
  dampening-change    Percent interface metric must change to cause update
  dampening-interval  Time in seconds to check interface metrics
  default             Set a command to its defaults
  exit-af-interface   Exit from Address Family Interface configuration mode
  hello-interval      Configures hello interval
  hold-time           Configures hold time
  next-hop-self       Configures EIGRP next-hop-self
  no                  Negate a command or set its defaults
  passive-interface   Suppress address updates on an interface
  shutdown            Disable Address-Family on interface
  split-horizon       Perform split horizon
  summary-address     Perform address summarization

Let’s try authentication:

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Forum Replies

  1. Hi William,

    Under topology base you will find commands that have to do with the EIGRP topology table. Stuff like redistribution, filtering, etc. Here’s an overview of all commands:

    R1(config-router)#router eigrp TEST                               
    R1(config-router)#address-family ipv4 unicast autonomous-system 1 
    R1(config-router-af)#topology base                                  
    Address Family Topology configuration commands:
      auto-summary         Enable automatic network number summarization
      cts                  EIGRP Trust
    ... Continue reading in our forum

  2. Hello Vinod

    The main differences between named and classic modes are the way in which they are implemented (globally for named while both globally and in interface mode for classic) as well as the addition of a sixth K value for the metric.

    On the back end, that is, concerning the way that the routers interpret and operate in EIGRP, very little has changed. So a named mode EIGRP router can communicate with a classic EIGRP router. Since you configure the AS number under the EIGRP name configuration, if the AS is the same, they will communicate.

    Now the only re

    ... Continue reading in our forum

  3. Hello Network

    EIGRP named mode supports what is known as the Wide Metrics feature. This feature supports 64-bit metric calculations as opposed to EIGRP classic mode that use 32-bit calculations. This results in varying metric values between the two.

    Wide metrics was introduced in order to accommodate high-bandwidth interfaces and Ethernet channels. The increase in available speeds has resulted in incorrect or inconsistent routing behavior with the classic EIGRP routing metrics. The lowest delay that can be configured for an interface is 10 microseconds. As a

    ... Continue reading in our forum

  4. Hi Rene and staff

    i just look at EIGRP named to configure a lab in another lesson
    So i explore the commands of the configuration modes; in the labs i did, i only used the topology mode base


    I tried to test (just for fun) the command with EIGRP that i suppose to set Multi-Topology Routing


    As you see, IOS answer “VIDEO does not exist”
    Could you give me

    ... Continue reading in our forum

  5. thank you very much Laz,

    After setting topology VIDEO under global-address-family, i went (just) a little further to explore the commands of the cisco doc example


    This is what i got


    Surprisingly i did not get the network command under ‘config-router-af-topology’

    I used this version of IOS in a GNS3 lab


    ... Continue reading in our forum

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