1.3.e EIGRP Named mode

From IOS v15.x onwards, EIGRP can be configured in Named mode which simplifies the configuration of EIGRP under one area of config, instead of spread between the router section and all the interfaces. 

Only a single instance of EIGRP needs to be created, but more can be if required.  This named instance can have IPv4 and IPv6 address families and supports multiple VRFs. 

Address family types: 

• IPv4 unicast 
• IPv4 multicast 
• IPv4 vrf 
• IPv6 unicast 
• IPv6 vrf 

Convert a Classic mode instance to Named mode with command (under the router eigrp process):

eigrp upgrade-cli <name>

There are three configuration modes in named EIGRP:

• Address-Family: to configure networks, EIGRP neighbor, EIGRP Router-id, metric etc.
• Address-Family-Interface: to configure all the interface specific commands that were previously configured on an actual interface (logical or physical) and moves them into the EIGRP configuration. For instance EIGRP authentication, split-horizon, summary-address configuration etc.
• Address-Family-Topology: to provide several options which operates on EIGRP topology table. For instance redistribution, distance, offset list, variance etc.

Configuration

IPv4

 router eigrp [NAME]

 address-family ipv4 unicast autonomous-system 100
  network [ADDRESS] [WILDCARD]

 af-interface default
  passive-interface
  exit-af-interface 

 af-interface [NAME]
  no passive-interface
  authentication mode md5
  authentication key-chain [KEYCHAIN]
  no split-horizon
  hello-interval 12
  exit-af-interface

 topology base
  redistribute connected
  distribute-list prefix [PREFIX-NAME] in
  exit-af-topology
 exit-address-family

 address-family ipv6 unicast autonomous-system 200
  topology base
   variance 2
   exit-af-topology
  exit-address-family

 address-family ipv4 unicast vrf [VRF NAME] autonomous-system 300
  network 0.0.0.0 0.0.0.0
 exit-address-family
!

IPv6

Once the IPv6 routing process is configured ALL Interfaces are enable by default.
The AS Number of IPv6 and IPv4 do not have to match.

router eigrp [NAME]

 address-family ipv6 unicast autonomous-system 200
  exit-address-family
!
! disable EIGRP on Interface by disabling it
 af-interface [NAME]
  shutdown
  exit-af-interface

Verification

IPv4

R9#sh ip eigrp neighbors 
EIGRP-IPv4 VR(INE) Address-Family Neighbors for AS(200)
H   Address                 Interface              Hold Uptime   SRTT   RTO  Q  Seq
                                                   (sec)         (ms)       Cnt Num
0   155.1.79.7              Gi0/0                    10 00:01:08    5   100  0  17

R9#sh ip eigrp interfaces 
EIGRP-IPv4 VR(INE) Address-Family Interfaces for AS(200)
                              Xmit Queue   PeerQ        Mean   Pacing Time   Multicast    Pending
Interface              Peers  Un/Reliable  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes
Lo0                      0        0/0       0/0           0       0/0            0           0
Gi0/0                    1        0/0       0/0           5       0/0           50           0
Gi0/1                    0        0/0       0/0           0       0/0            0           0

R9#sh ip eigrp topology 
EIGRP-IPv4 VR(INE) Topology Table for AS(200)/ID(150.1.9.9)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status 

P 155.1.79.0/24, 1 successors, FD is 1310720
        via Connected, GigabitEthernet0/0
P 155.1.5.0/24, 1 successors, FD is 3932160
        via 155.1.79.7 (3932160/3276800), GigabitEthernet0/0
P 150.1.7.7/32, 1 successors, FD is 1392640
        via 155.1.79.7 (1392640/163840), GigabitEthernet0/0
P 155.1.146.0/24, 1 successors, FD is 2621440
        via 155.1.79.7 (2621440/1966080), GigabitEthernet0/0
P 155.1.45.0/24, 1 successors, FD is 3276800
        via 155.1.79.7 (3276800/2621440), GigabitEthernet0/0
...
...

IPv6

R9#sh ipv6 eigrp neighbors 
EIGRP-IPv6 VR(INE) Address-Family Neighbors for AS(100)
H   Address                 Interface              Hold Uptime   SRTT   RTO  Q  Seq
                                                   (sec)         (ms)       Cnt Num
0   Link-local address:     Gi0/0                    13 00:26:15    6   100  0  70
    FE80::E2A:FFFF:FE7F:2

R9#sh ipv6 eigrp interfaces 
EIGRP-IPv6 VR(INE) Address-Family Interfaces for AS(100)
                              Xmit Queue   PeerQ        Mean   Pacing Time   Multicast    Pending
Interface              Peers  Un/Reliable  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes
Gi0/0                    1        0/0       0/0           6       0/0           50           0
Gi0/1                    0        0/0       0/0           0       0/0            0           0
Lo0                      0        0/0       0/0           0       0/0            0           0

R9#sh ipv6 eigrp topology 
EIGRP-IPv6 VR(INE) Topology Table for AS(100)/ID(150.1.9.9)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status 

P 2001:155:1:79::/64, 1 successors, FD is 1310720
        via Connected, GigabitEthernet0/0
P 2001:155:1:8::/64, 1 successors, FD is 4587520
        via FE80::E2A:FFFF:FE7F:2 (4587520/3932160), GigabitEthernet0/0, serno 32
P 2001:155:1:10::/64, 1 successors, FD is 5242880
        via FE80::E2A:FFFF:FE7F:2 (5242880/4587520), GigabitEthernet0/0, serno 33
P 2001:155:1:58::/64, 1 successors, FD is 3932160
        via FE80::E2A:FFFF:FE7F:2 (3932160/3276800), GigabitEthernet0/0, serno 34
P 2001:155:1:37::/64, 1 successors, FD is 1966080
        via FE80::E2A:FFFF:FE7F:2 (1966080/1310720), GigabitEthernet0/0
...
...

References: https://www.cisco.com/…/200156-Configure-EIGRP-Named-Mode.html