IP Router Configuration Command Reference
222 Router Configuration Guide
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 GI
address 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
GI address to be equal to the ingress interface and forward the request.
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 original
Option 82 information is lost anyway, and there is thus no reason for enabling the trusted option.
The no form of this command returns the system to the default.
Default not enabled
python-policy
Syntax python-policy name
no python-policy
Context config>router>if>dhcp
Description This command specifies a python policy. Python policies are configured in the config>python>
python-policy name context.
Parameters name — Specifies the name of an existing python script up to 32 characters in length.
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