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Guidelines for Using PPPoE Maximum Session Limit from RADIUS

Consider the following guidelines when you use the PPPoE maximum session value returned by RADIUS in the Max-Clients-Per-Interface vendor-specific attribute (VSA) [26-143]:

  • If the current number of sessions (including newly created sessions) is less than the new PPPoE maximum session value returned by RADIUS, the PPPoE application overrides the current value and enables interface creation to proceed.

  • If the current number of sessions (including newly created sessions) is equal to the new PPPoE maximum session value returned by RADIUS, the PPPoE application overrides the current value and enables interface creation to proceed.

  • If the current number of sessions (including newly created sessions) is greater than the new PPPoE maximum session value returned by RADIUS, the PPPoE application overrides the current value and brings down the new interface.

To illustrate these guidelines, Table 1 shows examples of how the router handles the PPPoE session when the current number of sessions is less than (first row), equal to (second row), and greater than (third row) the new PPPoE maximum session value returned by RADIUS when a new subscriber logs in.

Table 1: Sample PPPoE Maximum Session Values During Subscriber Login

New PPPoE Maximum Session Value from RADIUS

Current PPPoE Maximum Session Value

Existing Number of PPPoE Sessions

New PPPoE Maximum Session Value

New Number of PPPoE Sessions

Status of Session

10

5

4

10

5

PPPoE session up

5

5

4

5

5

PPPoE session up

3

5

4

3

4

PPPoE session down

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