ISO 8473
Connectionless Network Protocol
Data PDU
Options Part / Reason for Discard
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CNLP can be used in two different PDU types (data PDU, error-report PDU) with the following structure:
1. A fixed part which is used by both types;
2. an address part, also used by both types;
3. a segmentation part only used by data PDUs;
4. a variable options part;
5. a reason for discard field ony used by errror-report PDUs.
Options (n bytes)
Protocol: ISO 9542 / CLNS ES-IS
PDU Part: Options Part
Field: options
Length: n bytes
Contents: optional parameters.
If optional parameter are added, the will be structured as follows:
1. Parameter Code
2. Parameter Length
3. Paramete Value
Reason for Discard (2 bytes)
Protocol: ISO 9542 / CLNS ES-IS
PDU Part: [Error-Report PDU]
Field: Reason for Discard
Length: 2 bytes
Contents: reason why a PDU had been discarded.