MPLS Route Descriptor? What is it?

What is an MPLS Route Descriptor?
I'm trying to find a good definition of examples.
Thank you

Hi,
This book is one of the best MPLS books:
Cisco Press MPLS Fundamentals Nov 2006 by Luc De Ghein, CCIE No. 1897
You can also review the BGP/MPLS VPNs RFC:
http://www.rfc-editor.org/rfc/rfc2547.txt
And you can also review this document for briefing about configuring RD:
http://www.cisco.com/en/US/docs/ios/12_1/switch/command/reference/xrdscmd4.html#wp1035035
HTH,
Mohammed Mahmoud.

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