EIGRP - IPv6

EIGRP routing for IPv6 the same as IPv4 routing except you have enable the IPv6 routing with the following commands
you will see this error message if IPv6 routing not enabled
R1(config)#ipv6 router eigrp 10 
% IPv6 routing not enabled

R1(config)#ipv6 unicast-routing Enable unicast routing
R1(config)#ipv6 cef

R1(config)#ipv6 router eigrp 10
R1(config-rtr)#router-id 1.1.1.1

No network statements given at router config, instead its given at participating interface

R1(config-if)#ipv6 eigrp 10

Very important no shutdown to IPv6 EIGRP protocol 
or you will have errot message 

R3#show ipv6 eigrp interfaces 
IPv6-EIGRP interfaces for process 10

% EIGRP 10 is in SHUTDOWN

R2(config)#ipv6 router eigrp 10
R2(config-rtr)#no shut
R2(config-rtr)#
*Dec  6 01:47:09.363: %DUAL-5-NBRCHANGE: IPv6-EIGRP(0) 10: Neighbor FE80::C809:1DFF:FEA8:8 (Serial2/0) is up: new adjacency
*Dec  6 01:47:09.367: %DUAL-5-NBRCHANGE: IPv6-EIGRP(0) 10: Neighbor FE80::C80B:15FF:FE80:6 (FastEthernet0/1) is up: new adjacency

R2#show ipv6 route
IPv6 Routing Table - 11 entries
Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP
       U - Per-user Static route, M - MIPv6
       I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary
       O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
       ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
       D - EIGRP, EX - EIGRP external
D   2000:1::/64 [90/30720]
     via FE80::C809:1DFF:FEA8:8, Serial2/0
     via FE80::C80B:15FF:FE80:6, FastEthernet0/1
C   2000:2::/64 [0/0]
     via ::, Serial2/0
L   2000:2::2/128 [0/0]
     via ::, Serial2/0
C   2000:3::/64 [0/0]
     via ::, FastEthernet0/1
L   2000:3::2/128 [0/0]
     via ::, FastEthernet0/1
C   2000:4::/64 [0/0]
     via ::, FastEthernet0/0
L   2000:4::1/128 [0/0]
     via ::, FastEthernet0/0
D   2000:11::1111/128 [90/158720]
     via FE80::C809:1DFF:FEA8:8, Serial2/0
     via FE80::C80B:15FF:FE80:6, FastEthernet0/1
LC  2000:22::2222/128 [0/0]
     via ::, Loopback0
D   2000:33::3333/128 [90/156160]
     via FE80::C809:1DFF:FEA8:8, Serial2/0
     via FE80::C80B:15FF:FE80:6, FastEthernet0/1
L   FF00::/8 [0/0]

     via ::, Null0

Verification commands

1. show ipv6 protocol 
2. show ipv6 eigrp interface
3. show ipv6 eigrp neighbors 
4. show ipv6 route
5. show ipv6 eigrp topology 
6. show ipv6 cef

Modifying K values

R3(config-rtr)#metric weights 0 1 1 1 0 0

Configure Neighbors Authentication 

R2(config)#key chain Test

R2(config-keychain-key)#key-string pa$$word

R2(config-if)#ipv6 authentication key-chain eigrp 10 Test

R2#2(config-if)#ipv6 authentication mode eigrp 10 md5 

R2#show key chain 
Key-chain Test:
    key 10 -- text "pa$$word"
        accept lifetime (always valid) - (always valid) [valid now]
        send lifetime (always valid) - (always valid) [valid now]