Cisco IPv6 Training - IPv6 Requesting Router (RR) Configuration

Now you the first thing that you need to remember, is that the Requesting Router or RR is in most cases located at the customer's location (premises); it's 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 ISP's Delegating Router (DR); and then passing that Global IPv6 prefix information (configurable parameters) along through out the customer's location (Site) by using Router Advertisements (RA).

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

Router>enable
Router#configure terminal
Router(config)#interface type number

Router(config-if)#ipv6 address autoconfig [default]
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 router's serial 0/0 interface to automatically configure its own IPv6 address(es) by using Stateless Autoconfiguration.The word "default" is used to tell the serial 0/0 interface to install a default route into the RR's routing table; the default route indicates the upstream interface (serial 0/0) and the ISP's Delegating Router's interface.

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

Enables, the RR router's 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 ISP's Delegating Router. The word "rapid-commit" 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 "comcast-dhcp-prefix" used in the command is the name of the prefix.

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