MPLS Route Descriptor? What is it?

Unanswered Question
Aug 13th, 2007

What is an MPLS Route Descriptor?

I'm trying to find a good definition of examples.

Thank you

I have this problem too.
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mohammedmahmoud Mon, 08/13/2007 - 14:11


Route Descriptor is another naming for Route Distinguisher, MPLS allows distinct VPNs to use the same address space (address overlapping). This is achieved by adding a 64-bit route distinguisher (RD) to each IPv4 route, making VPN-unique addresses also unique in the MPLS core. This "extended" address is also called a VPN-IPv4 address.


Mohammed Mahmoud.

2pparish Mon, 08/13/2007 - 17:01

Thanks Mohammed.

Do you know where I can get more information about RD's and their use with MPLS-VPNs?

mohammedmahmoud Mon, 08/13/2007 - 22:48


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:

And you can also review this document for briefing about configuring RD:


Mohammed Mahmoud.


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