Alcatel-Lucent 7750 SR Manual page 1267

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.
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>vprn>if>dhcp>option
config>service>vprn>sub-if>grp-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 command
show>router>interface>detail. 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 circuit-id
Parameters ascii-tuple — Specifies that the ASCII-encoded concatenated tuple will be used which consists of the
ifindex — Specifies that the interface index will be used. The If Index of a router interface can be
sap-id — Specifies that the SAP ID will be used.
vlan-ascii-tuple — Specifies that the format will include VLAN-id and dot1p bits in addition to what
7750 SR OS Services Guide
Option 82 field from the router. 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 sent on
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.
access-node-identifier, service-id, and interface-name, separated by "|".
displayed using the command show>router>interface>detail.
is included in ascii-tuple already. The format is supported on dot1q and qinq ports only. Thus,
when the Option 82 bits are stripped, dot1p bits will be copied to the Ethernet header of an
outgoing packet.
Virtual Private Routed Network Services
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