EIGRP Named mode

EIGRP Named mode

• Named mode uses wide metric and is backward compatible with narrow metrics.
• It is compatible with classic mode for both IPv4 and IPv6. 
• All the IPv6 enabled interfaces will automatically be added to the EIGRP, once the address family is initiated.
• Due to the wide metric, the delay is in picoseconds as you can see in the below output.

R1#show ip eigrp topology 2.2.2.2/32

EIGRP-IPv4 VR(CORE) Topology Entry for AS(1)/ID(1.1.1.1) for 2.2.2.2/32

  State is Passive, Query origin flag is 1, 1 Successor(s), FD is 1392640, RIB is 10880

  Descriptor Blocks:

  10.1.2.2 (GigabitEthernet1), from 10.1.2.2, Send flag is 0x0

      Composite metric is (1392640/163840), route is Internal

      Vector metric:

        Minimum bandwidth is 1000000 Kbit

        Total delay is 11250000 picoseconds

        Reliability is 255/255

        Load is 1/255

        Minimum MTU is 1500

        Hop count is 1

        Originating router is 2.2.2.2

Configuration

From the basic topology, R1, R4 and R7 have been migrated to Name mode. Below is the configuration for R1 which R4 and R7 are also using.

R1

R1#sho run | se r e

router eigrp CORE

 !

 address-family ipv4 unicast autonomous-system 1

  !

  af-interface Loopback0

   passive-interface

  exit-af-interface

  !

  topology base

  exit-af-topology

  network 1.1.1.1 0.0.0.0

  network 10.1.2.1 0.0.0.0

  network 10.1.3.1 0.0.0.0

 exit-address-family

 !

 address-family ipv6 unicast autonomous-system 1

  !

  af-interface Loopback0

   passive-interface

  exit-af-interface

  !

  topology base

  exit-af-topology

  eigrp router-id 1.1.1.1

 exit-address-family

It is possible to migrate from classic mode to named mode with the command eigrp upgrade-cli.

Below is the example of migrating R2 from classic mode to named mode. 

Before change

R2(config-router)#do sh run | sec router eig

router eigrp 1

 network 2.2.2.2 0.0.0.0

 network 10.1.2.2 0.0.0.0

 network 10.2.4.2 0.0.0.0

 network 192.2.0.0 0.0.255.255

 offset-list 1 out 100 GigabitEthernet1

Running the command to change the mode.

R2(config)#router eigrp 1

R2(config-router)#eigrp upgrade-cli CORE

Configuration will be converted from router eigrp 1 to router eigrp CORE.

Are you sure you want to proceed? ? [yes/no]: yes

R2(config)#

*Jul  4 21:52:25.714: EIGRP: Conversion of router eigrp 1 to router eigrp CORE - Completed.

R2#sho running-config

*Jul  4 21:52:29.519: %SYS-5-CONFIG_I: Configured from console by console|

After the changes

R2#sho running-config | sec router ei

router eigrp CORE

 !

 address-family ipv4 unicast autonomous-system 1

  !

  af-interface GigabitEthernet1

   authentication mode md5

   authentication key-chain cisco

   summary-address 192.2.0.0 255.255.0.0

  exit-af-interface

  !

  af-interface GigabitEthernet2

   authentication mode md5

   authentication key-chain cisco

   summary-address 192.2.0.0 255.255.0.0

  exit-af-interface

  !

  topology base

   offset-list 1 out 100 GigabitEthernet1

  exit-af-topology

  network 2.2.2.2 0.0.0.0

  network 10.1.2.2 0.0.0.0

  network 10.2.4.2 0.0.0.0

  network 192.2.0.0 0.0.255.255

 exit-address-family

ipv6 router eigrp 1

 eigrp router-id 2.2.2.2