IPv6 Routing : EIGRP Example

I’m using a basic configuration with single loopback on each or R1 and R2.  R1 is configured using global prefix and R2 is using auto-config with no default…


  • A basic implementation similar to IPv4
  • Distance Vector
  • DUAL algorithm with Bandwidth/Delay as default metrics.
  • Classic (32bit metric) or Named (64bit Metric)
  • RTP as transport over FF02::A

Classic EIGRP

  • Configure IPv6 unicast routing
  • EIGRP IPv6 Routing Process with Router ID (won’t work without this!)
  • Enable EIGRP under the interface or via Network command
 ipv6 router eigrp 1
eigrp router-id (or on R2)
int fa 0/0
ipv6 eigrp 1
int lo 0
ipv6 eigrp 1

*Jul 29 10:20:49.363: %DUAL-5-NBRCHANGE: EIGRP-IPv6 1: Neighbor FE80::C801:56FF:FE00:8 (FastEthernet0/0) is up: new adjacency

R1#show ipv6 route eigrp
IPv6 Routing Table - default - 5 entries
Codes: C - Connected, L - Local, S - Static, U - Per-user Static route
B - BGP, HA - Home Agent, MR - Mobile Router, R - RIP
H - NHRP, I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea
IS - ISIS summary, D - EIGRP, EX - EIGRP external, NM - NEMO
ND - ND Default, NDp - ND Prefix, DCE - Destination, NDr - Redirect
O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2, l - LISP
D 2001:2222::/64 [90/156160]
via FE80::C802:4FF:FEA0:8, FastEthernet0/0

R1#show ipv6 eigrp neighbors
EIGRP-IPv6 Neighbors for AS(1)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 Link-local address: Fa0/0 11 00:01:52 29 174 0 3

R1#show ipv6 eigrp topology
EIGRP-IPv6 Topology Table for AS(1)/ID(
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status

P 2001:9999:9999:CAFE::/64, 1 successors, FD is 28160
via Connected, FastEthernet0/0
P 2001:2222::/64, 1 successors, FD is 156160
via FE80::C802:4FF:FEA0:8 (156160/128256), FastEthernet0/0
P 2001:1111:1111::1/128, 1 successors, FD is 128256
via Connected, Loopback0

Named Mode EIGRP IPv6

  • Configure IPv6 unicast routing
  • EIGRP IPv6 Named Routing Process
  • Enable IPv6 Address Family for Unicast with AS number. (Note the default is EIGRP is now enabled on all IPv6 interfaces unless they are passive!)
  • Summary Address configured under af-interface within IPv6 family.
R1(config)#router eigrp PROCESS-NAME
R1(config-router)#address-family ipv6 unicast auto 1
R1(config-router-af)#eigrp router-id

R2(config)#router eigrp PROCESS-NAME
R2(config-router)#address-family ipv6 unicast auto 1
R2(config-router-af)#eigrp router-id

*Jul 29 10:38:41.011: %DUAL-5-NBRCHANGE: EIGRP-IPv6 1: Neighbor FE80::C801:56FF:FE00:8 (FastEthernet0/0) is up: new adjacency

*Jul 29 10:36:54.491: %DUAL-5-NBRCHANGE: EIGRP-IPv6 1: Neighbor FE80::C802:4FF:FEA0:8 (FastEthernet0/0) is up: new adjacency

R2#show ipv6 eigrp interfaces
EIGRP-IPv6 VR(PROCESS-NAME) Address-Family Interfaces for AS(1)
                              Xmit Queue   PeerQ        Mean   Pacing Time   Multicast    Pending
Interface              Peers  Un/Reliable  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes
Fa0/0                    1        0/0       0/0          49       0/1          224           0
Lo0                      0        0/0       0/0           0       0/0            0           0
















































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