Alcatel-Lucent 7705 Service Manual page 470

VPRN Services Command Reference
Interface DHCP Commands
dhcp
Syntax dhcp
Context config>service>vprn>interface
Description This command enables the context to configure DHCP parameters.
option
Syntax [no] option
Context config>service>vprn>if>dhcp
Description
This command enables DHCP Option 82 (Relay Agent Information Option) parameters processing
and enters the context for configuring Option 82 suboptions.
The no form of this command returns the system to the default.
Default no option
action
Syntax action {replace | drop | keep}
no action
Context config>service>vprn>if>dhcp>option
Description This command configures the processing required when the 7705 SAR receives a DHCP request that
already has a Relay Agent Information Option (Option 82) field in the packet.
The no form of this command returns the system to the default value.
Default keep (as per RFC 3046, DHCP Relay Agent Information Option, section 2.1.1, Reforwarded DHCP
requests, the default is to keep the existing information intact. The exception to this occurs if the
gi-addr (gateway interface address) of the received packet is the same as the ingress address on the
router. In this case, the packet is dropped and an error is logged.)
Parameters replace — in the upstream direction (from the user), the existing Option 82 field is replaced with the
drop — the packet is dropped, and an error is logged
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Option 82 field from the router. In the downstream direction (towards the user) the Option 82
field is stripped (in accordance with RFC 3046).
7705 SAR OS Services Guide