IP Router Command Reference
126 7705 SAR OS Router Configuration Guide
action
Syntax action {replace | drop | keep}
no action
Context config>router>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 Option 82 field from the router. In the downstream direction (towards the user) the Option
82 field is stripped (in accordance with RFC 3046).
drop — the packet is dropped, and an error is logged
keep — the existing information is kept in the packet and the router does not add any additional
information. In the downstream direction, the Option 82 field is not stripped and is sent on
towards the client. If no Option 82 field is present, the router will not create the Option 82
field.
circuit-id
Syntax circuit-id [ascii-tuple | port-id | if-name]
no circuit-id
Context config>router>if>dhcp>option
Description When enabled, the router sends the interface index (If Index) in the circuit-id suboption of the DHCP
packet. The If Index of a router interface can be displayed using the show>router> interface>detail
command. This option specifies data that must be unique to the router that is relaying the circuit.
If disabled, the circuit-id suboption of the DHCP packet will be left empty.
The no form of this command returns the system to the default.
Default ascii-tuple
Parameters ascii-tuple — specifies that the ASCII-encoded concatenated “tuple” will be used, where “tuple”
consists of the system name, interface name, and port ID, separated by the syntax symbol “|”.
port-id — specifies that the port identifier will be used. The port identifier can be displayed using
the command show>router>interface>detail.
if-name — specifies that the interface name will be used
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