Begin with this topology:
First enable IPv6 routing, configure a router id (optional) and enable the EIGRP process:
Router(config)#ipv6 unicast-routing Router(config)#ipv6 router eigrp 1 Router(config-rtr)#eigrp router-id 1.1.1.1 Router(config-rtr)#no shutdown
Next configure EIGRP on each interface:
Router(config)#int g0/0 Router(config-if)#ipv6 address 2001:db8:0:0::/64 eui-64 Router(config-if)#ipv6 eigrp 1 Router(config-if)#no shutdown
The show commands are similar but use “ipv6” instead:
Router#show ipv6 int brief Ethernet0/0 [administratively down/down] unassigned GigabitEthernet0/0 [up/up] FE80::C801:17FF:FE26:8 2001:DB8::C801:17FF:FE26:8 GigabitEthernet1/0 [up/up] FE80::C801:17FF:FE26:1C 2001:DB8:0:3:C801:17FF:FE26:1C GigabitEthernet2/0 [administratively down/down] unassigned GigabitEthernet3/0 [administratively down/down] unassigned Router#show ipv6 eigrp 1 interfaces IPv6-EIGRP interfaces for process 1 Xmit Queue Mean Pacing Time Multicast Pending Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes Gi0/0 1 0/0 657 0/1 3272 0 Gi1/0 1 0/0 1029 0/1 6396 0 Router#show ipv6 eigrp 1 nhe Router#show ipv6 eigrp 1 ne Router#show ipv6 eigrp 1 neighbors IPv6-EIGRP neighbors for process 1 H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 1 Link-local address: Gi1/0 14 00:00:18 1029 5000 0 9 FE80::C803:17FF:FE44:1C 0 Link-local address: Gi0/0 11 00:11:30 657 3942 0 10 FE80::C802:17FF:FE35:8 Router#show ipv6 eigrp 1 topo Router#show ipv6 eigrp 1 topology IPv6-EIGRP Topology Table for AS(1)/ID(1.1.1.1) Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status P 2001:DB8:0:1::/64, 2 successors, FD is 3072 via FE80::C802:17FF:FE35:8 (3072/2816), GigabitEthernet0/0 via FE80::C803:17FF:FE44:1C (3072/2816), GigabitEthernet1/0 P 2001:DB8::/64, 1 successors, FD is 2816 via Connected, GigabitEthernet0/0 P 2001:DB8:0:3::/64, 1 successors, FD is 2816 via Connected, GigabitEthernet1/0 Router#show ipv6 eigrp 1 ? interfaces EIGRP interfaces neighbors EIGRP neighbors topology EIGRP Topology Table traffic EIGRP Traffic Statistics Router#show ipv6 route IPv6 Routing Table - Default - 6 entries Codes: C - Connected, L - Local, S - Static, U - Per-user Static route B - BGP, HA - Home Agent, MR - Mobile Router, R - RIP I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary D - EIGRP, EX - EIGRP external O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2 ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2 C 2001:DB8::/64 [0/0] via GigabitEthernet0/0, directly connected L 2001:DB8::C801:17FF:FE26:8/128 [0/0] via GigabitEthernet0/0, receive D 2001:DB8:0:1::/64 [90/3072] via FE80::C802:17FF:FE35:8, GigabitEthernet0/0 via FE80::C803:17FF:FE44:1C, GigabitEthernet1/0 C 2001:DB8:0:3::/64 [0/0] via GigabitEthernet1/0, directly connected L 2001:DB8:0:3:C801:17FF:FE26:1C/128 [0/0] via GigabitEthernet1/0, receive L FF00::/8 [0/0] via Null0, receive Router#
Use similar debug commands to diagnose issues with EIGRP for IPv6:
Router#debug ipv6 eigrp IP-EIGRP Route Events debugging is on Router# *Apr 21 17:42:10.127: IPv6-EIGRP(0:1): Processing incoming UPDATE packet *Apr 21 17:42:10.859: IPv6-EIGRP(0:1): Processing incoming UPDATE packet *Apr 21 17:42:10.859: IPv6-EIGRP(0:1): Int 2001:DB8:0:1::/64 M 3072 - 2560 512 SM 2816 - 2560 256 *Apr 21 17:42:10.859: IPv6-EIGRP(0:1): 2001:DB8:0:1::/64 (90/3072) added to RIB *Apr 21 17:42:10.859: IPv6-EIGRP(0:1): 2001:DB8:0:1::/64 (90/3072) added to RIB *Apr 21 17:42:10.859: IPv6-EIGRP(0:1): Int 2001:DB8:0:3::/64 M 3072 - 2560 512 SM 2816 - 2560 256 *Apr 21 17:42:10.859: IPv6-EIGRP(0:1): 2001:DB8:0:3::/64 routing table not updated *Apr 21 17:42:10.859: IPv6-EIGRP(0:1): Int 2001:DB8::/64 M 3328 - 2560 768 SM 3072 - 2560 512 *Apr 21 17:42:10.859: IPv6-EIGRP(0:1): 2001:DB8::/64 routing table not updated *Apr 21 17:42:10.859: IPv6-EIGRP(0:1): 2001:DB8::/64 routing table not updated *Apr 21 17:42:10.871: IPv6-EIGRP(0:1): 2001:DB8::/64 - do advertise out GigabitEthernet1/0 *Apr 21 17:42:10.871: IPv6-EIGRP(0:1): Int 2001:DB8::/64 metric 2816 - 2560 256 *Apr 21 17:42:10.871: IPv6-EIGRP(0:1): 2001:DB8:0:3::/64 - do advertise out GigabitEthernet1/0 *Apr 21 17:42:10.871: IPv6-EIGRP(0:1): Int 2001:DB8:0:3::/64 metric 2816 - 2560 256 *Apr 21 17:42:10.875: IPv6-EIGRP(0:1): Int 2001:DB8:0:1::/64 metric 3072 - 2560 512 *Apr 21 17:42:10.879: IPv6-EIGRP(0:1): Processing incoming UPDATE packet *Apr 21 17:42:10.879: IPv6-EIGRP(0:1): Int 2001:DB8:0:1::/64 M 3072 - 2560 512 SM 2816 - 2560 256 *Apr 21 17:42:10.879: IPv6-EIGRP(0:1): Int 2001:DB8:0:3::/64 M 3072 - 2560 512 SM 2816 - 2560 256 *Apr 21 17:42:10.879: IPv6-EIGRP(0:1): Int 2001:DB8::/64 M 3328 - 2560 768 SM 3072 - 2560 512 *Apr 21 17:42:10.891: IPv6-EIGRP(0:1): Processing incoming UPDATE packet *Apr 21 17:42:10.891: IPv6-EIGRP(0:1): Int 2001:DB8::/64 M 4294967295 - 2560 4294967295 SM 4294967295 - 2560 4294967295 *Apr 21 17:42:10.891: IPv6-EIGRP(0:1): 2001:DB8::/64 routing table not updated *Apr 21 17:42:10.899: IPv6-EIGRP(0:1): Int 2001:DB8:0:1::/64 metric 3072 - 2560 512 *Apr 21 17:42:10.975: IPv6-EIGRP(0:1): 2001:DB8::/64 - do advertise out GigabitEthernet1/0 *Apr 21 17:42:10.975: IPv6-EIGRP(0:1): Int 2001:DB8::/64 metric 2816 - 2560 256 *Apr 21 17:42:10.975: IPv6-EIGRP(0:1): 2001:DB8:0:3::/64 - do advertise out GigabitEthernet1/0 *Apr 21 17:42:10.979: IPv6-EIGRP(0:1): Int 2001:DB8:0:3::/64 metric 2816 - 2560 256