[c-nsp] IPv6 VPC Port channel Nexus -- 2951

[Scott Voll]

So I have a 2951 setup with a Port-channel to a set of L3 Nexus 5548's on a
VPC.

IPv4 seems to work fine.

IPv6 on the other hand I'm getting a loop detected.

%IPV6_ND-4-LOOPBACK: Looped back NS(DAD) packet detected for <IPv6 address>
on Port-channel XX.yy

What am I missing so that IPv6 will work?

Can someone head me down the right path?



Sample Config:

2951

interface Port-channelxx.yy
 encapsulation dot1Q xxx
 ip address 10.x.yy.5 255.255.255.0
ipv6 address 2620:xx:yy:zz::5/64
ipv6 enable

Nexus

interface port-channelxx
  description router
  switchport mode trunk
  speed 1000
  vpc xx

interface Vlanyyy
  description
  no shutdown
  ip address 10.x.yy.2/24
  ipv6 address 2620:xx:yy:zz::2/64
  ipv6 router <snip>
  ip router <snip>
  ip pim sparse-mode
  hsrp version 2
  hsrp yyy
    preempt
    priority 110
    ip 10.x.yy.1
  hsrp yyy ipv6
    preempt
    priority 130
    ip 2620:xx:yy:zz:::1
  ip dhcp relay address 10.x.y.z
  ipv6 dhcp relay address 2620:xx:yy:zz::40

is it as easy as only allowing router vlan's down the VPC on the nexus?

TIA

Scott