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IPv6 Training (Cisco): How is the DHCPv6 Requesting Router (RR) and Delegating Router (DR) Identified? 
 


Added: 08/14/2008, Hits: 3,976, Rating: 0, Comments: 0, Votes: 0
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Lately, I’ve been receiving a lot of emails in regards to the question “What is an IPv6 DUID?”

Well, an IPv6 DUID is actually a DHCP for IPv6 Unique Identifier or (DUID). It is used by the Requesting Router (RR) and the Delegating Router (DR) for identification when they are exchanging DHCPv6 messages. The DUID, is unique for every Requesting Router (RR) and Delegating Router (DR) device; and is formed (created) automatically from the Layer 2 Media Access Control (MAC) address of the “lowest-numbered” interface on each type of Requesting Router (RR) or Delegating Router (DR) device; or a network administrator can configure it manually with the help of ISP information.

The reason why the DUID is used for Requesting Router (RR) and Delegating Router (DR) identification, is because the DUID is actually “permanently” assigned to the Requesting Router (RR) or Delegating Router (DR) device; that means even after the Requesting Router (RR) or Delegating Router (DR) device has been rebooted; the DUID for that particular Requesting Router (RR) or Delegating Router (DR) will remain unchanged. (Some would say the DUID is a Stable Identifier)

I wrote this article about the DUID, because, I wanted to inform you about its function and too let you know that it plays an important role in the overall DHCP-Prefix Delegation (DHCP-PD) protocol message exchange(s) that occurs between a Requesting Router (RR) “the DHCPv6-Client” and a Delegating Router (DR) DR “the DHCPv6-Server”.

I invite you to visit my website at www.ciscoipv6ittechtips.com where you’ll find the latest information regarding Cisco IPv6 Design and Implementation Techniques. And, also learn more about the new "Cisco IPv6 Video Accelerated Training Course" which contains over 3000 videos that will teach you all you need to know about Desiging, Building, and Deploying Cisco IPv6 networks. (Guaranteed)

To your success,

Charles Ross
CCNP #CSCO10444244
www.ciscoipv6ittechtips.com








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