Juniper JUNOSE SOFTWARE 11.0.X - LINK LAYER CONFIGURATION GUIDE 4-1-2010 Configuration Manual page 368

JUNOSe 11.0.x Link Layer Configuration Guide
338
Configuring PPPoE over ATM
Use to override the current PPPoE maximum session value set with the pppoe
sessions command with the PPPoE maximum session value returned by the
RADIUS server in the Max-Clients-Per-Interface VSA [26-143].
RADIUS returns the Max-Clients-Per-Interface VSA value in Access-Accept
messages for each subscriber during PPP authentication.
By default, the router ignores the PPPoE maximum session value returned by
RADIUS.
The router never overrides the maximum number of PPPoE subinterfaces
supported per line module with a value from RADIUS that is either 0 (zero) or
greater than the maximum number of supported PPPoE subinterfaces. For
example, if the maximum number of PPPoE subinterfaces supported for a
particular line module is 8000 and the PPPoE maximum session value returned
by RADIUS is 0 (zero) or greater than 8000, the RADIUS value in this case is
ignored.
See JUNOSe Release Notes, Appendix A, System Maximums corresponding to your
software release for information about the maximum number of PPPoE
subinterfaces supported for each line module.
The following rules apply if you configure the router to override the current
PPPoE maximum session value for the interface with the PPPoE maximum
session value returned by RADIUS in the Max-Clients-Per-Interface VSA:
If the current PPPoE maximum session value is less than the PPPoE maximum
session value returned by RADIUS, the PPPoE application overrides the
current maximum session value with the value returned by RADIUS and
proceeds with creation of the PPPoE interface.
If the current number of active PPPoE sessions, including the current session,
is greater than the PPPoE maximum session value returned by RADIUS,
PPPoE ignores (drops) the new session.
If the current number of active PPPoE sessions is less than or equal to the
PPPoE maximum session value returned by RADIUS, PPPoE proceeds with
creation of the PPPoE interface.
The following table shows examples of the PPPoE maximum session value when
a new subscriber logs in, and indicates the status of the current session.
PPPoE Current
Maximum PPPoE
Session Maximum
Value from Session
RADIUS Value
10 5
3 5
5 5
Existing New PPPoE
Number of Maximum
PPPoE Session
Sessions Value
4 10
4 3
4 5
New Number
of PPPoE Status of
Sessions Session
5 PPP session
up
5 PPP/PPPoE
session down
5 PPP session
up