Sub-interface numbering setup

Question

I can't find it officially stated in any Sun documentation, but I'm assuming that when a global zones boots, it checks /etc/zones/*.xml, using the XML file when starting up each zone to assign the appropriate resources?
Is that correct? I'm just wanting to confirm how a global zone configures the interfaces for a local zone.
For example:
root@global00:/etc/zones> ifconfig -a
e1000g0:23: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
zone wlsdva27
inet xxx netmask ffffff00 broadcast xxxx
I'm not sure how to make sure that this interface configuration would survive from a complete restart of the entire server. In other words, that :23 would still be assigned the same IP after a complete server restart.
I understood that Solaris 9/10 needed /etc/hostname.interface to be setup:
root@glocal00:/etc/zones> ls /etc/host*
/etc/hostname.e1000g0 /etc/xxx /etc/xxxx
/etc/hosts /etc/xxx /etc/xxxx
root@global00:/etc/zones> cat /etc/hostname.e1000g0
global00
root@global00:/etc/zones>
I don't see any /etc/hostname.* files for any of the virtual interfaces... Would/should there be?
So, basically, with a system with multiple zones/containers, how does the global zone re-assign the same sub-interfaces to the same zone/container? I realize sub-interface numbering may not be all that important, but I was still wondering.

Answer 1

It's first-come first-serve on virtual interfaces. They are not assigned statically.