Virtual Private LAN Services
Page 354 7210 SAS-X, R6 OS Services Guide
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.
gi-address
Syntax gi-address ip-address [src-ip-addr]
no gi-address
Context config>service>ies>if>dhcp
config>service>vprn>if>dhcp
Description This command configures the gateway interface address for the DHCP relay. A subscriber interface
can include multiple group interfaces with multiple SAPs. The GI address is needed, when the router
functions as a DHCP relay, to distinguish between the different subscriber interfaces and potentially
between the group interfaces defined.
By default, the GI address used in the relayed DHCP packet is the primary IP address of a normal IES
interface. Specifying the GI address allows the user to choose a secondary address.
Default no gi-address
Parameters ip-address — Specifies the host IP address to be used for DHCP relay packets.
src-ip-address — Specifies the source IP address to be used for DHCP relay packets.
circuit-id
Syntax circuit-id [ascii-tuple | ifindex | sap-id | vlan-ascii-tuple]
no circuit-id
Context config>service>vpls>sap>dhcp>option
config>service>ies>if>dhcp>option
config>service>vprn>if>dhcp>option
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