[CentOS] CUPS and virtual interfaces

I've got a server with multiple virtual interfaces. Now, I only want CUPS to advertise on *one* - eth0, not eth0:1 or eth0:gad....

Looking at the CUPS manual, and cuppsd.conf man page, I see BrowseAllow, but the entries are not clear enough for me to understand what they mean. (Yeah, I know the docs are better than they were - read ESR's rant about it from a few years ago.)

Specifically, I *think* I'd like to use BrowseAllow @IF, but I can't figure out if that should be BrowseAllow @IF(eth0) or BrowseAllow @IF(hostname)

Also, if it's interface name, and there are multiple virtual interfaces on eth0, and I use the first of the two lines, above, will that *not* also apply to the VIs on eth0?

mark