Cisco IPv6 Training IPv6 Requesting Router (RR) Configuration

How to Configure an IPv6 Requesting Router

By Charles Ross CCNP #CSCO10444244

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.

To your success,

Charles Ross

CCNP #CSCO10444244