Parents & siblings ???

Hi all..

Can someone give me a bit of a better idea about the relationships in Squid.

I'm in the process of designing a proxy server setup for my work, and then configuring it for use by our clients, so I need a clear idea of how it all ties together.

Planned config:

www-proxy -> one IP address, which points to a Cisco LocalDirector
(http://www.cisco.com/warp/public/751/lodir/index.html).
www-proxy1 & www-proxy2 sit behind the LocalDirector, existing on a 100BaseT segment, with the ability (high probability!!) of adding more cache servers as load increases. All members of the cache farm have full connectivity to the rest of the Internet. Each member of the cache farm will have to be able to act as if it was a lone cache in the event that none of the siblings or parents were available..

Now, I want to configure the cache farm to ICP poll each other first before heading off the local network into the great blue beyond.

All of the cache farm will also be configured to point to other squid caches higher up in a hierarchy. country-proxy1 should be treated as the major cache for specific country codes .. i.e. .au .nz .fj .nf (just off the top of my head)

What would be the recommended squid hierarchy? At a guess, I'd configure like this..

www-proxy1.domain: cache_host www-proxy2.domain sibling
                                cache_host country-proxy1 sibling
                                cache_host sd.cache.nlanr.net parent
                                cache_host sv.cache.nlanr.net parent
                                neighbour_type_domain sd.cache.nlanr.net sibling .au ...
                                neighbour_type_domain sv.cache.nlanr.net sibling .au ...
                                neighbour_type_domain country-proxy1 parent .au ...

www-proxy2.domain: cache_host www-proxy1.domain sibling
                                cache_host country-proxy1 sibling
                                cache_host sd.cache.nlanr.net parent
                                cache_host sv.cache.nlanr.net parent
                                neighbour_type_domain sd.cache.nlanr.net sibling .au ...
                                neighbour_type_domain sv.cache.nlanr.net sibling .au ...
                                neighbour_type_domain sv.cache.nlanr.net sibling .au ...
                                neighbour_type_domain country-proxy1 parent .au ...

Any comments, suggestions, corrections, pointers?