tutorial - Configure Squid to use other Proxy (cache)

If you want Squid to be part of a hierarchy of proxies or want Squid to fetch content from another proxy
cache_peer proxy.isp.com parent 8080 0 no-query no-digest ever_direct allow all

For Multiple parent
cache_peer proxy.isp1.com parent 8080 0 no-query no-digest default
cache_peer proxy.isp2.com parent 8080 0 no-query no-digest


Multiple parents with weight:
cache_peer proxy.isp1.com parent 8080 0 no-query no-digest weight=1 
cache_peer proxy.isp2.com parent 8080 0 no-query no-digest weight=2


Multiple parents with round-robin:
cache_peer proxy.isp1.com parent 8080 round-robin no-query
cache_peer proxy.isp2.com parent 8080 round-robin no-query
cache_peer proxy.isp3.com parent 8080 round-robin no-query

In above examples proxy.isp1.com, proxy.isp2.com and proxy.isp2.com are other cache servers


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