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IPv6 Training (Cisco): How to Configure an IPv6 Requesting Router 

Added: 08/20/2008, Hits: 4,330, Rating: 0, Comments: 0, Votes: 0
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Now, you the first thing that you need to remember is that the Requesting Router or RR is in most cases located at the customerís location (premises); itís the router that the customer (Site) has either purchased or has been given to them by their ISP.

In real world situations, the RR has 2 main responsibilities; obtaining the Global IPv6 prefix information (configurable parameters) from the ISPís Delegating Router (DR); and then passing that Global IPv6 prefix information (configurable parameters) along through out the customerís location (Site) by using Router Advertisements (RA).

Now, in order for you to configure a Cisco routerís upstream interface to act like a Requesting Router (DHCP client) youíll need to perform these 5 steps:

  1. Router>enable

  2. Router#configure terminal

  3. Router(config)#interface type number

  4. Router(config-if)#ipv6 address autoconfig [default]

  5. Router(config-if)#ipv6 dhcp client pd prefix-name [rapid-commit]

Steps Explained:

Step #1: - Router>enable

Puts the router into Privileged Exec mode

Step #2: - Router#configure terminal

Puts the router into Global Configuration mode

Step #3 - Router(config)#interface serial 0/0

Allows, the RR to enter interface configuration mode for the serial 0/0 interface.

Step #4 - Router(config)#ipv6 address autoconfig default

Allows, the RR routerís serial 0/0 interface to automatically configure its own IPv6 address(es) by using Stateless Autoconfiguration. The word ďdefaultĒ is used to tell the serial 0/0 interface to install a default route into the RRís routing table; the default route indicates the upstream interface (serial 0/0) and the ISPís Delegating Routerís interface.

Step #5 - Router(config-if)#ipv6 dhcp client pd comcast-dhcp-prefix rapid-commit

Enables, the RR routerís serial 0/0 interface to begin acting as a DHCPv6 client; and also forces the interface to start requesting an IPv6 Prefix(es) from the ISPís Delegating Router. The word ďrapid-commitĒ is telling the interface (serial 0/0) to use the DHCPv6 two-message exchange method to ask for the IPv6 Prefix(es).

Now, just in case if you were wondering, the words ďcomcast-dhcp-prefixĒ used in the command is the name of the prefix.

I invite you to visit my website at where youíll 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 Designing, Building, and Deploying Cisco IPv6 networks. (Guaranteed)

To your success,

Charles Ross
CCNP #CSCO10444244

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