Configuring the Device as a DHCPv6 Relay

A DHCPv6 client communicates with and obtains an IP address from a DHCPv6 server on another network segment through a DHCPv6 relay agent. DHCPv6 relay allows DHCPv6 clients on different network segments to share a DHCPv6 server, which reduces costs and manage information uniformly.

Prerequisites

A DHCPv6 server has been configured based on a global address pool.

No interface address pool can be configured for the DHCPv6 server interface that connects to the DHCPv6 relay.
The DHCPv6 server and the DHCPv6 relay interface are routable to each other.

Context

During certain phases in DHCPv6 configuration, the DHCPv6 client sends broadcast packets; therefore, the DHCPv6 relay interface must support the broadcast mode.

A DHCPv6 relay interface supports a maximum of 8 DHCPv6 server addresses or next-hop relays addresses.

Procedure

Access the system view.
```
system-view
```
Enable IPv6 globally.
```
ipv6
```
Access the DHCPv6 relay interface view.
```
interface interface-type interface-number [ .sub-interface-number ]
```
The interface can be an Ethernet interface or its subinterface, a Vlanif interface, or an Eth-trunk interface or its subinterface.
Enable IPv6 on the interface.
```
ipv6 enable
```

Assign an IPv6 address to the interface.

ipv6 address { ipv6-address prefix-length |ipv6-address/prefix-length }

Enable DHCPv6 relay on the interface and configure an IPv6 address for the DHCPv6 server or the next-hop relay.
```
dhcpv6 relay destination ipv6-address
```
When multiple DHCP relays exist on the network, specify the DHCP server IP address on the last DHCP relay and the next-hop relay IP address on the other DHCP relays.