MPLS Route Descriptor? What is it?

2pparish · ‎08-13-2007

What is an MPLS Route Descriptor?

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

Thank you

mohammedmahmoud · ‎08-13-2007

Hi,

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.

HTH,

Mohammed Mahmoud.

2pparish · ‎08-13-2007

Thanks Mohammed.

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

mohammedmahmoud · ‎08-13-2007

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.