Juniper JUNOSE 11.1.X - LINK LAYER CONFIGURATION 4-7-2010, Configuration Manual

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By contrast, when the connection between the router and the DSLAM is on an Ethernet
interface that does not use either virtual LANs (VLANs) or stacked VLANs (S-VLANs),
the NAS-Port-Id value is the same for all subscribers on the Ethernet link. Enabling
the router to capture the remote circuit ID sent from the DSLAM and use it as a
RADIUS or L2TP attribute facilitates the process of identifying individual subscribers
on an Ethernet link.
PPPoE Remote Circuit ID Capture
When you enable capture of the PPPoE remote circuit ID by issuing the pppoe
remote-circuit-id command, the E Series router captures the remote circuit ID value
if it is sent from the DSLAM. The PPPoE intermediate agent on the DSLAM appends
a vendor-specific tag containing the remote circuit ID to the existing PPPoE PADI or
PADR packet and sends this packet to the E Series router. The PPPoE remote circuit
ID value can be a maximum of 64 characters. The router stores this value on the line
module on which the PPPoE interface is configured.
PPPoE Remote Circuit ID Format
By default, the router formats the captured PPPoE remote circuit ID to include only
the agent-circuit-id suboption (suboption 1) of the PPPoE intermediate agent tags
sent from the DSLAM. To configure a nondefault format for the captured PPPoE
remote circuit ID, you can use one of the
radius remote-circuit-id-format commands
listed in Table 20 on page 380.
Table 20: Configuring Nondefault Formats for the PPPoE Remote Circuit ID
Use This Command To Configure This Nondefault Format
host1(config)# radius remote-circuit-id-format
agent-remote-id
Include only the agent-remote-id suboption
(suboption 2) of the tags supplied by the PPPoE
intermediate agent
host1(config)# radius remote-circuit-id-format
agent-circuit-id agent-remote-id
Include both the agent-circuit-id suboption
(suboption 1) and the agent-remote-id
suboption (suboption 2) of the tags supplied by
the PPPoE intermediate agent
host1(config)# radius remote-circuit-id-format
nas-identifier agent-circuit-id
or
host1(config)# radius remote-circuit-id-format
nas-identifier agent-remote-id
or
host1(config)# radius remote-circuit-id-format
nas-identifier agent-circuit-id
agent-remote-id
Include the NAS-Identifier [32] RADIUS attribute
with either or both of the agent-circuit-id and
agent-remote-id suboptions of the tags supplied
by the PPPoE intermediate agent
380 ■
Overview
JUNOSe 11.1.x Link Layer Configuration Guide