IPv6 Question related to plumbing interfaces

All,

This is kind of long so to summarize I am just trying to get a static IPv6 address plumbed with a persistent default route. I have gotten this to work however, not as I wanted. I have a working production server that I am comparing my results against. My question is why when I plumb the interface do I also get additional interfaces. I am just trying to enable and configure IPv6 on igb1.

1. Configure /etc/inet/ndpd.conf with the following:
     ifdefault StatelessAddrConf false
     ifdefault StatefulAddrConf false

2. Configure /etc/hostname6.igb1
     addif x:y:z:1001::41/64 up

3. Start IPv6 and configure interface
     ifconfig igb1 inet6 plumb
     ifconfig igb1:1 inet6 plumb 
     ifconfig igb1:1 inet6 x:y:z:1001::40/64 up

4.Add persistent static route
     route -p add -inet6 default z:y:z:1001::15


This works. However, this is what my output from ifconfig -a6 looks like as well as netstat -rn -f inet6

lo0: flags=2002000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv6,VIRTUAL> mtu 8252 index 1
	inet6 ::1/128 
igb1: flags=2000841<UP,RUNNING,MULTICAST,IPv6> mtu 1500 index 2
	inet6 fe80::221:28ff:fe75:dc01/10 
	ether 0:21:28:75:dc:1 
igb1:1: flags=2000841<UP,RUNNING,MULTICAST,IPv6> mtu 1500 index 2
	inet6 x:y:z:1001::41/64 
igb1:2: flags=20a0841<UP,RUNNING,MULTICAST,NOLOCAL,ADDRCONF,IPv6> mtu 1500 index 2
	inet6 subnet x:y:z:1001::/64 
igb1:3: flags=20a0841<UP,RUNNING,MULTICAST,NOLOCAL,ADDRCONF,IPv6> mtu 1500 index 2
	inet6 subnet x:y:z:1001::/64 

Routing Table: IPv6
  Destination/Mask            Gateway                   Flags Ref   Use    If   
--------------------------- --------------------------- ----- --- ------- ----- 
x:y:z:1001::/64             x:y:z:1001::41              U       1       4 igb1:1 
x:y:z:1001::/64             x:y:z:1001::41              U       1       0 igb1:3 
x:y:z:1001::/64             x:y:z:1001::41              U       1       0 igb1:2 
fe80::/10                   fe80::221:28ff:fe75:dc01    U       1       1 igb1  
ff00::/8                    fe80::221:28ff:fe75:dc01    U       1       0 igb1  
default                     2001:480:501:2302::15       UG      1       0       
default                     fe80::215:62ff:fe3e:f343    UG      1       0 igb1  
::1                         ::1                         UH      1       0 lo0   

I thought the purpose of the /etc/inet/ndpd.conf file was to stop the autoconfiguration of igb1:2, and igb1:3.  However, I must be wrong. I have compared my files to that of the server in production that is working. The production server shows just one interface configured igb1:1. How do i get mine to only configure one interface?

I have tried to add the suggested sun configuration of /etc/hostname6.igb1 to include
     x:y:z:1001::41
     addif x:y:z:1001::41/64 up

When I add this and reboot the zone. I do only get one interface configured igb1:1. However, I can only ping myself and not my gateway. My routing table afterwards via netstat -rn -f inet6 looks like as well as ifconfig -a6

lo0: flags=2002000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv6,VIRTUAL> mtu 8252 index 1
	inet6 ::1/128 
igb1: flags=2000840<RUNNING,MULTICAST,IPv6> mtu 1500 index 2
	inet6 fe80::221:28ff:fe75:dc01/10 
	ether 0:21:28:75:dc:1 
igb1:1: flags=2000841<UP,RUNNING,MULTICAST,IPv6> mtu 1500 index 2
	inet6 z:y:z:1001::41/64 

Routing Table: IPv6
  Destination/Mask            Gateway                   Flags Ref   Use    If   
--------------------------- --------------------------- ----- --- ------- ----- 
z:y:z:1001::/64             z:y:z:1001::41              U       1       4 igb1:1 
default                       z: y:z:1001::15              UG      1       0       
::1                         ::1                         UH      1       0 lo0   


Thanks