Virtual Private LAN Services
7750 SR OS Services Guide Page 657
option
Syntax [no] option
Context config>service>vpls>sap>dhcp
Description This command enables DHCP Option 82 (Relay Agent Information Option) parameters processing
and enters the context for configuring Option 82 sub-options.
The no form of this command returns the system to the default.
Default no option
action
Syntax action [dhcp-action]
no action
Context config>service>vpls>sap>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 dhcp-action — Specifies the DHCP option action.
replace — In the upstream direction (from the user), the Option 82 field from the router is
inserted in 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).
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
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.
circuit-id
Syntax circuit-id [ascii-tuple | vlan-ascii-tuple]
Context config>service>vpls>sap>dhcp>option
Description When enabled, the router sends an ASCII-encoded tuple in the circuit-id suboption of the DHCP
packet. This ASCII-tuple consists of the access-node-identifier, service-id, and SAP-ID, separated by
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