IPv6 routing issue on Nexus

[tinhnho123]

Hi guys,

I try to configure IPv6 with EIGRP for my topology; for some reason, the EIGRP routing table isn't learning the IPv6 subnet from its neighbor 

When I run 'show ipv6 route interface t0/0/0' on the router side and 'show ipv6 route interface e1/1' on the Nexus side, I don't see IPv6  EIGRP routing on either side. Do you know why is that?

Router's configuration:

int TenGigabitEthernet0/0/0
ipv6 address 2805:725:245:245::2/64
ipv6 enable
ipv6 nd prefix default no-advertise
end

Interface BDI10
ipv6 address 2805:725:245:10::1/64
ipv6 enable
ipv6 nd prefix default no-advertise
ipv6 nd prefix 2805:725:245:10::/64 infinite infinite no-autoconfig

router eigrp R175
!
address-family ipv6 unicast autonomous-system 175
!
af-interface BDI10
passive-interface
exit-af-interface
!
af-interface TenGigabitEthernet0/0/0
passive-interface
exit-af-interface

topology base
exit-af-topology
exit-address-family
!

Router#sh ipv6 route interface t0/0/0
C 2805:725:245:245::/64 [0/0]
via TenGigabitEthernet0/0/0, directly connected
L 2805:725:245:245::2/128 [0/0]
via TenGigabitEthernet0/0/0, receive
Router#
=========================
Nexus's configuration:

router eigrp 175
metric version 64bit
address-family ipv6 unicast

int e1/1
ipv6 address 2805:725:245:245::1/64
ipv6 nd prefix default no-advertise
no ipv6 redirects
ipv6 router eigrp 175
no shutdown

int vlan 100
ipv6 address 2805:725:240:100::1/64
ipv6 nd prefix 2805:725:240:100::/64 infinite infinite no-autoconfig
ipv6 nd prefix default no-advertise
ipv6 nd router-preference High
no ipv6 directs
no shut

Nexus#sh ipv6 route interface e1/1
IPv6 Routing Table for VRF "default"
'*' denotes best ucast next-hop
'**' denotes best mcast next-hop
'[x/y]' denotes [preference/metric]

2805:725:245:245::/64, ubest/mbest: 1/0, attached
*via 2805:725:245:245::1, Eth1/1, [0/0], 5w1d, direct,
2805:725:245:245::1/128, ubest/mbest: 1/0, attached
*via 2805:725:245:245::1, Eth1/1, [0/0], 5w1d, local
2805:725:245:245::2/128, ubest/mbest: 1/0, attached
*via 2805:725:245:245::2, Eth1/1, [250/0], 5w1d, am
Nexus#

[David Ruess]

Hello,

Do you see nay EIGRPv6 neighbors?

Not sure if you have anything mixed up but your diagram shows the interface connected to the Nexus as T0/0/1, however in your config the IPv6 address is on T0/0/0 AND that interface is passive in the EIGRP process. If the T0/0/0 interface is connected to the Nexus it will NOT form an EIGRP adjacency as it is passive.

-David

[tinhnho123]

I messed it up on the diagram. It's corrected now.  Yes, it's T0/0/0 on the router side. Should we take the 'passive-interface' off of the router?:

af-interface TenGigabitEthernet0/0/0
passive-interface
exit-af-interface

[Harold Ritter]

Hi @tinhnho123 ,

You definitely need to take the passive-interface off te0/0/0. As @David Ruess mentioned, the eigrp neighbor relationship will not come up otherwise.

Regards,