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5.9. Discard-Request Connected: An Internet Encyclopedia
5.9. Discard-Request

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Next: 6. LCP Configuration Options

5.9. Discard-Request

5.9. Discard-Request

Description

LCP includes a Discard-Request Code in order to provide a Data Link Layer sink mechanism for use in exercising the local to remote direction of the link. This is useful as an aid in debugging, performance testing, and for numerous other functions.

Discard-Request packets MUST only be sent in the LCP Opened state. On reception, the receiver MUST silently discard any Discard- Request that it receives.

A summary of the Discard-Request packet format is shown below. The fields are transmitted from left to right.

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     Code      |  Identifier   |            Length             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                         Magic-Number                          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |    Data ...
   +-+-+-+-+

Code

11 for Discard-Request.

Identifier

The Identifier field MUST be changed for each Discard-Request sent.

Magic-Number

The Magic-Number field is four octets, and aids in detecting links which are in the looped-back condition. Until the Magic-Number Configuration Option has been successfully negotiated, the Magic- Number MUST be transmitted as zero. See the Magic-Number Configuration Option for further explanation.

Data

The Data field is zero or more octets, and contains uninterpreted data for use by the sender. The data may consist of any binary value. The end of the field is indicated by the Length.


Next: 6. LCP Configuration Options

Connected: An Internet Encyclopedia
5.9. Discard-Request

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