Guidelines for Configuring Encapsulation Type Lockout for PPPoE Sessions

The following rules apply when you configure the lockout time for dynamic encapsulation type lockout:

• The lockout time value is defined as

  (minimum lockout time) * (2 ^ n-1)

  where n represents the number of consecutive lockout events.

• The router increments the value of n when the time between lockout events is either within 15 minutes or the maximum lockout time, whichever is greater.
• When the time between lockout events is greater than either 15 minutes or the maximum lockout time, the value of n reverts to 1. This condition is referred to as a grace period.
• The lockout time never exceeds the maximum configured lockout time. For example, for a configured lockout time in the range 20–120 seconds, the increasing lockout time sequence is 20 seconds, 40 seconds, 80 seconds, and finally, 120 seconds.
• A short-cycle event is a dynamic interface that is created and torn down within 60 seconds. The router tracks the time between short-cycle events to determine whether to increase the lockout time for a subsequent short-cycle event.

  Note: When the calculated lockout time is equal to or exceeds the maximum lockout time, the router uses the maximum lockout time value until the time to the next event exceeds the greater of 15 minutes or the maximum lockout time value. At that point, the lockout time reverts to the minimum lockout time value.

• The minimum lockout time value cannot exceed the maximum lockout time value. When the minimum and maximum values are equal, the encapsulation type lockout time becomes fixed.