SCTP Packet Structure - Chunk Types

Chunk Types

RFC 2960 defines the following list of chunk types.

Following this table each chunk and its parameters are defined. Please note the following color scheme:

  • gray: chunk fields
  • red: fixed parameters
  • green/blue: optional/variable-length parameters that alternate colors
Value Abbreviation Description
0 DATA Payload data
1 INIT Initiation
2 INIT ACK initiation acknowledgement
3 SACK Selective acknowledgement
4 HEARTBEAT Heartbeat request
5 HEARTBEAT ACK Heartbeat acknowledgement
6 ABORT Abort
7 SHUTDOWN Shutdown
8 SHUTDOWN ACK Shutdown acknowledgement
9 ERROR Operation error
10 COOKIE ECHO State cookie
11 COOKIE ACK Cookie acknowledgement
12 ECNE Explicit congestion notification echo (reserved)
13 CWR Congestion window reduced (reserved)
14 SHUTDOWN COMPLETE Shutdown complete
15-62 N/A Reserved by IETF
63 IETF-defined chunk extensions
64-126 Reserved by IETF
127 IETF-defined chunk extensions
128-190 Reserved by IETF
191 IETF-defined chunk extensions
192-254 Reserved by IETF
255 IETF-defined chunk extensions

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