Dhcpv6 Relay - ZyXEL Communications GS1920v2 Series User Manual

Figure 247 DHCP Relay for Two VLANs Configuration Example

53.7 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 view and configure DHCPv6 relay settings for a specific VLAN on the Switch. Click
NETWORKING > DHCP > DHCPv6 Relay in the navigation panel to display the screen as shown.
Figure 248 NETWORKING > DHCP > DHCPv6 Relay
The following table describes the labels in this screen.
Table 189 NETWORKING > DHCP > DHCPv6 Relay
LABEL
VID
Helper Address
Interface ID
DESCRIPTION
This field displays the VLAN ID number.
This field displays the IPv6 address of the remote DHCPv6 server for this VLAN.
This field displays whether the interface-ID option is added to DHCPv6 requests from clients in this
VLAN.
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