07-27-2018 12:31 PM - edited 03-05-2019 10:48 AM
Hey guys, I'm in the process of obtaining my CCNP and I'm currently working with EIGRP and IPv6. For some reason, I cannot receive EIGRP routes into my routing table even though neighborships have been established. Please review the config below and let me know if you see anything that stands out.
R1:
interface Loopback0
no ip address
ipv6 address 2001::2/64
ipv6 enable
ipv6 eigrp 100
!
interface GigabitEthernet0/0
no ip address
duplex auto
speed auto
media-type rj45
ipv6 enable
ipv6 eigrp 100
!
ipv6 router eigrp 100
eigrp router-id 1.1.1.1
default-metric 1000 100 255 1 1500
R2:
interface Loopback0
no ip address
ipv6 address 2001::2/64
ipv6 enable
ipv6 eigrp 100
!
interface GigabitEthernet0/0
no ip address
duplex auto
speed auto
media-type rj45
ipv6 enable
ipv6 eigrp 100
!
ipv6 router eigrp 100
eigrp router-id 2.2.2.2
default-metric 1000 100 255 1 1500
Routing table:
IPv6 Routing Table - default - 3 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
RL - RPL, O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1
OE2 - OSPF ext 2, ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
la - LISP alt, lr - LISP site-registrations, ld - LISP dyn-eid
lA - LISP away, a - Application
C 2001::/64 [0/0]
via Loopback0, directly connected
L 2001::2/128 [0/0]
via Loopback0, receive
L FF00::/8 [0/0]
via Null0, receive
EIGRP neighbors:
show ipv6 eigrp neighbors
EIGRP-IPv6 Neighbors for AS(100)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 Link-local address: Gi0/0 11 00:16:34 2000 5000 0 2
FE80::50A3:62FF:FE45:AA00
07-27-2018 02:21 PM
Where is your L3 reachability IP between R1 and R2 routers.
The config you have provided not have that information until you have any other mode of connectivity.
please refer below example :
BB
07-28-2018 04:39 AM
Did you expect the prefix from the other routers Loopback IF announced per EIGRP? It is announced but since you configured the IPs for both routers from the same /64 prefix it's not accepted in the route table because the locally connected prefix has a lower AD.
Best practice for IPv6 Loopback IF: /128
BTW, please avoid using official global unicast addresses as example for your posts (unless related to that provider), better use the IANA reserved documentation prefix: 2001:db8::/32
07-29-2018 04:46 AM - edited 07-29-2018 05:09 AM
Hi Scott,
you are using the same IPv6 address over the loopback on both routers, they must be different.
07-29-2018 11:22 PM
hi,
aside from what others have suggested, did you enable ipv6 unicast-routing and configure a WAN IPv6 address?
kindly post a show run output on both R1 and R2.
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