Alcatel-Lucent 7750 SR OS Service Manual page 742

IES Service Configuration Commands
IES Interface DHCP Commands
dhcp
Syntax dhcp
Context config>service>ies>interface
config>service>ies>sub-if
config>service>ies>sub-if>grp-if
Description
This command enables the context to configure DHCP parameters.
action
Syntax action {replace | drop | keep}
no action
Context config>service>ies>if>dhcp>option
config>service>ies>sub-if>grp-if>dhcp>option
Description
This command configures the Relay Agent Information Option (Option 82) processing.
The no form of this command returns the system to the default value.
Default
The default is to keep the existing information intact.
Parameters
replace — In the upstream direction (from the user), the Option 82 field from the router is inserted in
drop — The DHCP packet is dropped if an Option 82 field is present, and a counter is incremented.
keep — The existing information is kept in the packet and the router does not add any additional
circuit-id
Syntax circuit-id [ascii-tuple | ifindex | sap-id | vlan-ascii-tuple]
no circuit-id
Context config>service>ies>if>dhcp>option
config>service>ies>sub-if>grp-if>dhcp>option
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the packet (overwriting any existing Option 82 field). In the downstream direction (towards the
user) the Option 82 field is stripped (in accordance with RFC 3046).
information. In the downstream direction the Option 82 field is not stripped and is forwarded
towards the client.
The behavior is slightly different in case of Vendor Specific Options (VSOs). When the keep
parameter is specified, the router will insert his own VSO into the Option 82 field. This will only
be done when the incoming message has already an Option 82 field.
If no Option 82 field is present, the router will not create the Option 82 field. In this in that case,
no VSO will be added to the message.
7750 SR OS Services Guide