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IPv6 on nexus with private vlan and vrf

Hello community,

I have the following situation: I map two private vlans to one on a cisco nexus7700 C7706 (System Version 7.3). The interface mapping it (say vlan107) is part of a vrf with a default route to another gateway which basically leads to the main router and therefore everything else. This setup is basically unchangeable for me because of various reasons. This works fine on IPv4, but I'm currently trying to introduce IPv6 as well. Therefore, I added 

ipv6 address 2001:1:2:3::4/64

ipv6 nd ra dns server 2001:1:2:4::1 10000 sequence 1

ipv6 nd reachable-time 10

ipv6 nd prefix 2001:1:2:3:4::/64 

to the configuration of the interface vlan107 and

ipv6 route 0::/0 2001:5:6:7::1 (which is the other router gateway in the VRF) to the VRF config.

Unfortunately, nothing happens, none even gets an IPv6 address. So my question is: Do I need to turn on something else to make this work? For example, "show ipv6 nd interface vlan101" permanently says "Last Router-Advertisement sent: never" and "Next Router-Advertisement sent in: 0.000000" which clearly can't both be true. 

Thanks in advance for any hints!

Christian

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