Switch4 is not a route reflector client. To configure this switch, enter the following commands:
create vlan "net" enable loopback-mode vlan net create vlan "v1" configure vlan v1 add ports 9 configure v1 ipaddress 2001:db8:5::2/48 configure net ipaddress 2001:db8:2555::1/48 enable ipforwarding ipv6 configure bgp AS-number 100 configure bgp routerid 5.1.1.2 configure bgp add network address-family ipv6-unicast 2001:db8:2555::/48 create bgp neighbor 2001:db8:5::1 remote-AS-number 100 enable bgp neighbor 2001:db8:5::1 capability ipv6-unicast enable bgp neighbor 2001:db8:5::1 enable bgp configure ospfv3 routerid 5.1.1.2 configure ospfv3 add vlan v1 area 0.0.0.0 enable ospfv3