Internet Enhanced Services
7750 SR OS Services Guide Page 743
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
the access-node-identifier, service-id, and interface-name, separated by “|”.
ifindex — Specifies that the interface index will be used. The If Index of a router interface can be
displayed using the command show>router>interface>detail.
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
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.
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 HW MAC address are not guaranteed
to be unique.
When the match-circuit-id command is enabled, it is used as part of the key to guarantee correctness
in our lookup. This is really only needed when we are dealing with an IP aware DSLAM that proxies
the client HW mac address.
Default no match-circuit-id
option
Syntax [no] option
Context config>service>ies>if>dhcp
config>service>ies>sub-if>grp-if>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.
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