| SDCP, PPP Serial Data Control Protocol |
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Description | Glossary | RFCs | Publications | Obsolete RFCs |
| Protocol suite: | PPP. |
| Protocol type: | PPP network control protocol. |
| PPP protocol: | 0x8049. |
| MIME subtype: | |
| SNMP MIBs: | |
| Working groups: | |
| Links: | PPP Assigned numbers. |
The SDCP protocol is used for establishing, configuring and disabling the SDTP modules on both ends of the PPP link.
SDCP uses the same packet exchange mechanism and state machine as the Link Control Protocol. SDCP packets may not be exchanged until PPP has reached the Network-Layer Protocol phase. SDCP packets received before this phase is reached SHOULD be silently discarded.
Before any SDTP packets may be communicated, PPP must reach the Network-Layer Protocol phase, and the SDTP Control Protocol must reach the Opened state.
| PPP header | SDCP header | Data ::: |
SDCP header:
| 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Code | Identifier | Length | |||||||||||||||||||||||||||||
| Data ::: | |||||||||||||||||||||||||||||||
Code.
8 bits.
Specifies the function to be performed.
| Code | Description | References |
|---|---|---|
| 0 | Vendor Specific. | RFC 2153 |
| 1 | Configure-Request. | |
| 2 | Configure-Ack. | |
| 3 | Configure-Nak. | |
| 4 | Configure-Reject. | |
| 5 | Terminate-Request. | |
| 6 | Terminate-Ack. | |
| 7 | Code-Reject. |
Identifier.
8 bits.
Used to match requests and replies.
Length.
16 bits.
Size of the packet including the header.
Data. Variable length.
Zero or more bytes of data as indicated by the Length.
This field may contain one or more Options.
SDCP Configuration Options.
| 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Option | Length | ||||||||||||||
| Data ::: | |||||||||||||||
Option. 8 bits.
| Option | Length | Description | References |
|---|---|---|---|
| 1 | 3 | Packet-Format. | RFC 1963 |
| 2 | 3 | Header-Type. | RFC 1963 |
| 3 | 3 | Length-Field-Present. | RFC 1963 |
| 4 | 3 | Multi-Port. | RFC 1963 |
| 5 | 4 | Transport-Mode. | RFC 1963 |
| 6 | 7 | Maximum-Frame-Size. | RFC 1963 |
| 7 | 3 | Allow-Odd-Frames. | RFC 1963 |
| 8 | 4 | FCS-Type. | RFC 1963 |
| 9 | 5 | Flow-Expiration-Time. | RFC 1963 |
Length. 8 bits.
Data. Variable length.
RFCs:
[RFC 1963] PPP Serial Data Transport Protocol (SDTP).
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Description | Glossary | RFCs | Publications | Obsolete RFCs |