IPS Implementaion

I was wondering if anyone knows of any
documents/papers/book/suggestions on the proper way to implement an
IPS in a large environment.  We had a vendor install the IPS units,
and they were supposed to tune the signatures and apply filters,
however there is still a lot of work to be done.  I have been tasked
with putting a plan together to get these units to begin automatic
blocking instead of currently only watching traffic, but unfortunately
I only have experience using Snort in a small environment without a
lot of abnormal traffic.  All the books I've been able to find online
are either out of date or inadequate.  Any help would be greatly
appreciated!

Thanks,

Chris Moore

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