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RFC1661 - часть 11


Discard-Requests -- are not differentiated in the automaton

descriptions. As will be described later, these packets do indeed

serve different functions. However, they always cause the same

transitions.

Events Actions

Up = lower layer is Up tlu = This-Layer-Up

Down = lower layer is Down tld = This-Layer-Down

Open = administrative Open tls = This-Layer-Started

Close= administrative Close tlf = This-Layer-Finished

TO+ = Timeout with counter > 0 irc = Initialize-Restart-Count

TO- = Timeout with counter expired zrc = Zero-Restart-Count

RCR+ = Receive-Configure-Request (Good) scr = Send-Configure-Request

RCR- = Receive-Configure-Request (Bad)

RCA = Receive-Configure-Ack sca = Send-Configure-Ack

RCN = Receive-Configure-Nak/Rej scn = Send-Configure-Nak/Rej

RTR = Receive-Terminate-Request str = Send-Terminate-Request

RTA = Receive-Terminate-Ack sta = Send-Terminate-Ack

RUC = Receive-Unknown-Code scj = Send-Code-Reject

RXJ+ = Receive-Code-Reject (permitted)

or Receive-Protocol-Reject

RXJ- = Receive-Code-Reject (catastrophic)

or Receive-Protocol-Reject

RXR = Receive-Echo-Request ser = Send-Echo-Reply

or Receive-Echo-Reply

or Receive-Discard-Request

Simpson [Page 11]

RFC 1661 Point-to-Point Protocol July 1994

4.1. State Transition Table

The complete state transition table follows. States are indicated

horizontally, and events are read vertically. State transitions and

actions are represented in the form action/new-state. Multiple

actions are separated by commas, and may continue on succeeding lines

as space requires; multiple actions may be implemented in any

convenient order. The state may be followed by a letter, which

indicates an explanatory footnote. The dash ('-') indicates an

illegal transition.

| State

| 0 1 2 3 4 5

Events| Initial Starting Closed Stopped Closing Stopping

------+-----------------------------------------------------------

Up | 2 irc,scr/6 - - - -

Down | - - 0 tls/1 0 1

Open | tls/1 1 irc,scr/6 3r 5r 5r

Close| 0 tlf/0 2 2 4 4




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