Steps & Observation(Tested with Dual stack Router):

Topology/Pre-condition : N1 (S1-IPV4, S2-IPV6), R1, VPN1, 3 ports for each subnet. Only S2-IPV6 associated with Router.

Both IPv4 and IPv6 address were not advertised in DC-GW

SCenario1 :

1. Create L3VPN. --> PASS
2. Associate Router to L3VPN and check FIB --> **PASS
3. Add S1-IPV4 to Router and check IPv4 address advertised. --> PASS
4. Delete L3VPN and check all the routes withdrawn --> **PASS
5. Create L3VPN and Add router to L3VPN à FAIL (Only IPv4 address advertised in DC-GW. IPv6 not observed)**

SCenario2:**
**

1. Create Network1 with two subnets(IPv4 and IPv6).**
2. Create ports and boot VM's
3. Create router and add both IPv4 and IPv6 subnets to router.
4. create L3VPN
5. Associate Router to L3VPN and validate FIB & RIB. --> FAIL