Chapter 54 DHCP
XGS4600 Series User’s Guide
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54.8 DHCPv6 Relay
A DHCPv6 relay agent is on the same network as the DHCPv6 clients and helps forward messages
between the DHCPv6 server (that is in another network) and the DHCPv6 clients.
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 > DHCPv6 Relay in the navigation panel to display the screen as shown.
Figure 401 IP Application > DHCP > DHCPv6 Relay
The following table describes the labels in this screen.
Table 240 IP Application > DHCP > DHCPv6 Relay
LABEL DESCRIPTION
VID Enter the ID number of the VLAN to which the DHCPv6 server that will assign IP information
belongs here.
Helper Address Enter the IPv6 address of the DHCPv6 server that will assign IP information here.
An 128-bit IPv6 address is written as eight 16-bit hexadecimal blocks separated by colons (:). This
is an example IPv6 address ‘2001:0db8:1a2b:0015:0000:0000:1a2f:0000’.
IPv6 addresses can be abbreviated in two ways:
• Leading zeros in a block can be omitted. So ‘2001:0db8:1a2b:0015:0000:0000:1a2f:0000’ can
be written as ‘2001:db8:1a2b:15:0:0:1a2f:0’.
• Any number of consecutive blocks of zeros can be replaced by a double colon. A double
colon can only appear once in an IPv6 address. So
‘2001:0db8:0000:0000:1a2f:0000:0000:0015’ can be written as
‘2001:0db8::1a2f:0000:0000:0015’, ‘2001:0db8:0000:0000:1a2f::0015’, ‘2001:db8::1a2f:0:0:15’
or ‘2001:db8:0:0:1a2f::15’.
Options
Interface ID Select this option to have the Switch add the interface-ID option in the DHCPv6 requests from
the clients in the specified VLAN before the Switch forwards them to a DHCPv6 server.
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