EIGRP Named Mode Configuration

can i check this in Gns 3 ? i cant find it under 7200

I don’t think GNS3 supports any IOS images that support this, maybe IOU does. I tried this example on a CSR1000v router so that’s also a good option.

Hi All,

GNS3 is supporting it features with 7200 model Version 15.2(4)S3.

I have tested it.


Please help me understand why you say everything is done globally. First, from global config mode, you have to go into named mode configuration; then you go into address-family mode; then, for each address family, you go into af-interface mode, topology base mode or whatever other mode there is. Frankly speaking, I wouldn’t care much for EIGRP Named Mode configuration if it wasn’t for the fact that you have to if you want to pass Cisco’s exam.

Hi Simon,

With the classic version of EIGRP, some commands were configured globally and others were done on the interface. For example, advertising networks is done globally under the EIGRP process and authentication or summarization is done on the interface level.

With named mode, everything is done in global mode under the router process but sometimes you have to jump to a “sub” section like the af-interface level.


Rene - it seems like there is a lot that is done under topology base. Can you expand on that?

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 Trustsec Configuration
  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 entries in eigrp updates
  eigrp                EIGRP specific commands
  exit-af-topology     Exit from Address Family Topology configuration mode
  maximum-paths        Forward packets over multiple paths
  metric               Modify metrics and parameters for advertisement
  no                   Negate a command or set its defaults
  offset-list          Add or subtract offset from EIGRP metrics
  redistribute         Redistribute IPv4 routes from another routing protocol
  snmp                 Modify snmp parameters
  summary-metric       Specify summary to apply metric/filtering
  timers               Adjust topology specific timers
  topo-interface       Enter Topology interface configuration
  traffic-share        How to compute traffic share over alternate paths
  variance             Control load balancing variance


Hi Rene,

Could you please talk in deep about address-family and service-family?


Hi Minh,

Address-families are used for different protocols. For example, in EIGRP there is an address-family for IPv4 and another address-family for IPv6.

For BGP, there are address families for unicast, multicast, VPN routes and each of those for both IPv4 and IPv6.

The service family for EIGRP is used for SAF (Service Advertisement Framework). SAF is some framework that is used for Voice over IP. Instead of IPv4/IPv6, you can exchange SAF stuff with EIGRP .


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Hi Rene ,

IN EIGRP NAME MODE , DO WE NEED TO BE SAME NAME in all of router within autonomous system.


Hello Aung

When using EIGRP in name mode, you must use the same name for each instance of EIGRP that is running. This is done in the same way that you would configure a single Autonomous System number for each instance of EIGRP. If you are running multiple instances, then you would use multiple names.

I hope this has been helpful!


Hi Lagapides ,

Thanks …Well understand this explanation…

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Hi Rane, can we put some light where we have mix mode ( named and as based)…will they form neighborhood each other…will they exchange route from each other…how to deal with it

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 restriction is the issue with the K values. In order for EIGRP named and classic to interoperate, the number of K values must be the same. There are two possibilities.

One is that the classic EIGRP is being run on an older version of IOS which supports 5 K values. Named EIGRP configured router that receives EIGRP packets with 5 K values will revert to functioning with 5 K values and will not advertise the sixth.

The other possibility is that classic EIGRP is configured on a newer IOS version will actually advertise a sixth K value, but will not have it participate in the metric calculation. This is why you may see a K6 value in a wireshark capture of an EIGRP exchange. This will allow classic EIGRP to successfully interface with a named EIGRP configured router, without actually using that 6th K value for the metric.

I hope this has been helpful!


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I tested EIGRP named mode in GNS3 with both Dynamips and IOSv. It seems in named mode metric calculation varies from the classic mode. Even the metric calculation in the topology table is not the one in the routing table. Does anyone know the reason please? Thank you.

L0: --R1——R2

R1#sho int l0 | inc DLY
  MTU 1514 bytes, BW 8000000 Kbit/sec, DLY 5000 usec,

R2#sho int g0/0 | inc DLY
  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,

R2#sho ip route
Routing entry for
  Known via "eigrp 100", distance 90, metric 10880, type internal
  Redistributing via eigrp 100
  Last update from on GigabitEthernet0/0, 00:04:48 ago
  Routing Descriptor Blocks:
  *, from, 00:04:48 ago, via GigabitEthernet0/0
      Route metric is 10880, traffic share count is 1
      Total delay is 12 microseconds, minimum bandwidth is 1000000 Kbit
      Reliability 255/255, minimum MTU 1500 bytes
      Loading 1/255, Hops 1

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 result, interfaces with speeds of 10 Gbps or more including channeld interfaces will appear to EIGRP as a single GE interface. For this reason, the 64 bit metric calculation has been introduced resulting in different metric values. More on this can be found here:

The new 64 bit metric calculations are designed to be backward compatible with classic EIGRP. However, sometimes scaling can be an issue. More on this can be found below.

I hope this has been helpful!


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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 some explanation where i can set a topology that is not the topology base ?

Hello Dominique

In order to specify a topology other than base, you must define it first. As the following Cisco documentation states:

The topology must be defined globally with the global-address-family command in global address-family configuration mode before the topology can be configured under the EIGRP process.

Now how do you do that? Well, here’s an example:

 Router(config)# global-address-family ipv4 
 Router(config-af)# topology VIDEO
 Router(config-af-topology)# all-interfaces 
 Router(config-af-topology)# end 

You can find out more about this command here:


I hope this has been helpful!


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

So, and sorry about that, that takes me to a new question: in my example, how to activate the interfaces of the topology VIDEO for EIGRP ?

Hello Dominique

The example provided from the link I sent you that you attempted is found in the Cisco IOS IP Routing: EIGRP Command Reference document. This is a general overview document providing commands that are common to multiple platforms and IOS versions. Because various IOS versions may deal with commands differently, there is always the possibility that some differences may appear in such documents.

Viewing documents that are more specific to the topics in question, we can get a more accurate view of the commands and how they function. This is the case for this situation. If you look at the following link from Cisco’s “Multitopology Routing Configuration Guide, Cisco IOS Release 15S” document, you will find that the commands are slightly different.

Here you are told to configure the network command outside of the VOICE topology configuration mode. But, you can specify which topology is being used on a per interface basis as shown in the link below:

Try experimenting with these variations in the commands and I believe that you will find the solution that matches your IOS version.

I hope this has been helpful!