Alcatel-Lucent 7750 SR Manual page 968

IES Interface Commands
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
Description
When enabled, the router sends either an ASCII tuple, or the interface index (If Index), on the
specified SAP ID in the circuit-id suboption of the DHCP packet.
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 ascii-tuple
Parameters
ascii-tuple — Specifies that the ASCII-encoded concatenated tuple will be used which consists of
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, dot1p bits in addition to what is
match-circuit-id
Syntax [no] match-circuit-id
Context config>service>ies>sub-if>grp-if>dhcp
Description
This command enables Option 82 circuit ID on relayed DHCP packet matching.
For Routed CO, the group interface DHCP relay process is stateful. When packets are relayed to the
server the virtual router ID, transaction ID, SAP ID, and client hardware MAC address of the relayed
packet are tracked. When a response is received from the server the virtual router ID, transaction ID,
and client HW MAC address must be matched to determine the SAP on which to send the packet out.
In some cases, the virtual router ID, transaction ID, and client hardware MAC address are not
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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.
the access-node-identifier, service-id, and interface-name, separated by "|".
displayed using the command show>router>interface>detail.
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.
7750 SR OS Services Guide