Alcatel-Lucent 7450 Configuration Manual page 211

Description
This command specifies whether the system-id is encoded in the Alcatel-Lucent vendor specific sub-
option of Option 82.
Default None
relay-plain-bootp
Syntax [no] relay-plain-bootp
Context config>router>if>dhcp
Description
This command enables the relaying of plain BOOTP packets.
The no form of the command disables the relaying of plain BOOTP packets.
server
Syntax server server1 [server2...(up to 8 max)]
Context config>router>if>dhcp
Description This command specifies a list of servers where requests will be forwarded. The list of servers can
entered as either IP addresses or fully qualified domain names. There must be at least one server
specified for DHCP relay to work. If there are multiple servers then the request is forwarded to all of
the servers in the list. There can be a maximum of 8 DHCP servers configured.
The flood command is applicable only in the VPLS case. There is a scenario with VPLS where the
VPLS node only wants to add Option 82 information to the DHCP request to provider per-subscriber
information, but it does not do full DHCP relay. In this case, the server is set to "flood". This means
the DHCP request is still a broadcast and is sent through the VPLS domain. A node running at L3
further upstream then can perform the full L3 DHCP relay function.
Default
no server
Parameters server — Specifies the DHCP server IP address.
trusted
Syntax [no] trusted
Context config>router>if>dhcp
Description According to RFC 3046, DHCP Relay Agent Information Option, a DHCP request where the giaddr
is 0.0.0.0 and which contains a Option 82 field in the packet, should be discarded, unless it arrives on
a "trusted" circuit.
If trusted mode is enabled on an IP interface, the relay agent (the SR-Series) will modify the request's
giaddr to be equal to the ingress interface and forward the request.
Note that this behavior only applies when the action in the Relay Agent Information Option is "keep".
In the case where the Option 82 field is being replaced by the relay agent (action = "replace"), the
7450 ESS Router Configuration Guide
IP Router Configuration
Page 211