System ID Extension - Mac Address Reduction

Salam,

Gurus, if someone has written an article with configuration examples of
System ID Extension - Mac Address Reduction, please share or similar
resource.

I have read in cisco docs, ccie routing and switching 4 ed, BCMSN CCNP exam
guide 4th edition, but didnt find good stuff regarding it ...

Your help will be appreciated ...

-- 
Regards,
M. Faisal.
Blogs and organic groups at http://www.ccie.net