Juniper JUNOSE 11.0.X MULTICAST ROUTING, Configuration Manual

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Sessions
Table 77 on page 409 describes operational states of the sessions.
Table 77: Session Operational States
Description State
New sessions start in the authenticating state. In this state, the dial-out state
machine has received a valid trigger and is waiting for authentication,
authorization, and accounting (AAA) to complete the initial authentication.
On getting a grant from AAA, the session transitions to the connecting state.
Alternatively, on getting a deny from AAA, the session transitions to the
inhibited state.
authenticating
Sessions enter the connecting state when authentication is complete. In this
state, the dial-out state machine has initiated an outgoing L2TP call. On
entering this state, the session-connecting timer is set to the chassis-wide
trigger timer value. The session stays in this state until either the outgoing
call is successful or the connecting timer expires. Any new trigger packets
received for this session when it is in the connecting state are discarded. connecting
A session enters the inService state from the connecting state on successful
completion of the dial-out call request. The session stays in this state until
the outgoing call is closed. inService
A session enters the inhibited state from the connecting state when the
connecting timer expires (that is, the outgoing call was unsuccessful). This
state prevents the router from thrashing on an outgoing call that cannot be
completed. When in this state, the router discards all trigger packets received
for the session.
The inhibited timer controls the amount of time spent in this state. The setting
of the inhibited timer varies depending on whether the session is entering
the inhibited state for the first time or is reentering the state.
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If it is the first time, the inhibited timer is initialized to the chassis-wide
trigger value.
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If it is reentering the state, the inhibited timer is initialized to 2 times
the previous value of the inhibited timer, up to a maximum of 8 times
the chassis-wide trigger value. For example, if the chassis-wide trigger
value is 30 seconds, the setting of the inhibited timer within the session
(on subsequent immediate reentries; see postInhibited state) is 30, 60,
120, 240. Since 240 is 8 x 30, the inhibited timer for this session is
never set larger than 240 seconds.
inhibited
A session enters the postInhibited state after completion of an inhibited state.
The inhibited timer is reused to control the amount of time the session stays
in postInhibited state. In this state the timer repeatedly times out and reduces
the inhibited timer by a factor of 2 on each iteration. Once the inhibited
timer reaches zero, the session transitions to dormant. The receipt of a trigger
in this state results in a transition to the authenticating state. postInhibited
L2TP Dial-Out Overview
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Chapter 14: Configuring L2TP Dial-Out