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39.6 DHCPv6 Relay
A DHCPv6 relay agent is on the same network as the DHCPv6 clients and helps forward messages
between the DHCPv6 server and clients. When a client cannot use its link-local address and a well-
known multicast address to locate a DHCPv6 server on its network, it then needs a DHCPv6 relay
agent to send a message to a DHCPv6 server that is not attached to the same network.
The DHCPv6 relay agent can add the remote identification (remote-ID) option and the interface-ID
option to the Relay-Forward DHCPv6 messages. The remote-ID option carries a user-defined string,
such as the system name. The interface-ID option provides slot number, port information and the
VLAN ID to the DHCPv6 server. The remote-ID option (if any) is stripped from the Relay-Reply
messages before the relay agent sends the packets to the clients. The DHCPv6 server copies the
interface-ID option from the Relay-Forward message into the Relay-Reply message and sends it to
the relay agent. The interface-ID should not change even after the relay agent restarts.
Use this screen to configure DHCPv6 relay settings for a specific VLAN on the Switch. Click IP
Application > DHCP > DHCPv6 in the navigation panel to display the screen as shown.
Figure 223 IP Application > DHCP > DHCPv6
The following table describes the labels in this screen.
Table 182 IP Application > DHCP > DHCPv6
LABEL
VID
Helper Address
Options
Interface ID Select this option to have the Switch add the interface-ID option in the DHCPv6 requests
Remote ID
Add
Chapter 39 DHCP
DESCRIPTION
Enter the ID number of the VLAN you want to configure here.
Enter the remote DHCPv6 server address for the specified VLAN.
from the clients in the specified VLAN before the Switch forwards them to a DHCPv6 server.
Enter a string of up to 64 printable characters to be carried in the remote-ID option. The
Switch adds the remote-ID option in the DHCPv6 requests from the clients in the specified
VLAN before the Switch forwards them to a DHCPv6 server.
Click this to create a new entry or to update an existing one.
This saves your changes to the Switch's run-time memory. The Switch loses these changes if
it is turned off or loses power, so use the Save link on the top navigation panel to save your
changes to the non-volatile memory when you are done configuring.
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