Справочник по сетевым протоколам


RFC1661 - часть 14


have no status signals available, but SHOULD NOT be used for

switched circuits.

Closing

In the Closing state, an attempt is made to terminate the

connection. A Terminate-Request has been sent and the Restart

timer is running, but a Terminate-Ack has not yet been received.

Upon reception of a Terminate-Ack, the Closed state is entered.

Upon the expiration of the Restart timer, a new Terminate-Request

is transmitted, and the Restart timer is restarted. After the

Restart timer has expired Max-Terminate times, the Closed state is

entered.

Stopping

The Stopping state is the Open counterpart to the Closing state.

A Terminate-Request has been sent and the Restart timer is

running, but a Terminate-Ack has not yet been received.

Rationale:

The Stopping state provides a well defined opportunity to

terminate a link before allowing new traffic. After the link

has terminated, a new configuration may occur via the Stopped

or Starting states.

Request-Sent

In the Request-Sent state an attempt is made to configure the

connection. A Configure-Request has been sent and the Restart

timer is running, but a Configure-Ack has not yet been received

Simpson [Page 15]

RFC 1661 Point-to-Point Protocol July 1994

nor has one been sent.

Ack-Received

In the Ack-Received state, a Configure-Request has been sent and a

Configure-Ack has been received. The Restart timer is still

running, since a Configure-Ack has not yet been sent.

Ack-Sent

In the Ack-Sent state, a Configure-Request and a Configure-Ack

have both been sent, but a Configure-Ack has not yet been

received. The Restart timer is running, since a Configure-Ack has

not yet been received.

Opened

In the Opened state, a Configure-Ack has been both sent and

received. The Restart timer is not running.

When entering the Opened state, the implementation SHOULD signal

the upper layers that it is now Up. Conversely, when leaving the

Opened state, the implementation SHOULD signal the upper layers

that it is now Down.




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