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Table 7-1 cont Chunk ID values and chunk types
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ID value 00001101 00001110 00001111 to 00111110 00111111 01000000 to 01111110 01111111 10000000 to 10111110 10111111 11000000 to 11111110 11111111 Chunk type
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Reserved for Congestion Window Reduced (CWR) Shutdown Complete (SHUTDOWN COMPLETE) Reserved by IETF IETF-defined Chunk Extension Reserved by IETF IETF-defined Chunk Extension Reserved by IETF IETF-defined Chunk Extension Reserved by IETF IETF-defined Chunk Extension
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Chunk ID values are encoded such that the two highest-order bits specify the action that must be taken if the processing endpoint does not recognize the chunk type The possible bits and their meanings are as follows:
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00 Stop processing this SCTP packet and discard it; do not process any further chunks within it 01 Stop processing this SCTP packet and discard it, do not process any further chunks within it, and report the unrecognized parameter in an Unrecognized Parameter Type (in either an ERROR or in an INIT ACK) 10 Skip this chunk and continue processing 11 Skip this chunk and continue processing, but report an ERROR chunk using the Unrecognized Chunk Type cause of error
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SCTP Control Chunks The INIT chunk is used to initiate an SCTP association
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between two endpoints Unlike many other chunks, the INIT chunk must not share an SCTP packet with any other chunk In other words, an SCTP packet containing an INIT chunk must contain no other chunks besides the INIT chunk The INIT chunk is further described later in this chapter The INIT ACK chunk is used to acknowledge the initiation of an SCTP association As is the case for the INIT chunk, the INIT ACK chunk must not share a packet with any other chunk
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VoIP and SS7
VoIP and SS7
The SACK chunk is used to acknowledge the receipt of DATA (payload) chunks and to inform the sender of any gaps in the received chunks Not every received chunk merits a SACK chunk in response Instead, the SACK chunk works by indicating where gaps occur Let us suppose that a receiver has received chunks 1 through 5, plus chunks 8 and 9 The SACK message is used to indicate that chunks 6 and 7 are missing These are the only chunks that need to be resent This technique is more efficient that the retransmit mechanism of TCP The HEARTBEAT chunk is used to query the reachability of a particular endpoint Let s assume that no chunks need to be sent from endpoint A to endpoint B during a particular period of time In that case, endpoint A will send periodic HEARTBEAT messages to endpoint B, just to make sure that endpoint B is still alive The HEARTBEAT contains sender-specific information The receiver of the HEARTBEAT chunk should respond with a HEARTBEAT ACK chunk containing heartbeat information copied from the received HEARTBEAT chunk The ABORT chunk is sent by an endpoint to end an association abruptly The ABORT chunk may contain cause information regarding the reason for aborting the association The ABORT chunk may be multiplexed with other SCTP control chunks into one packet In such cases, however, the ABORT chunk should be the last chunk in the packet If it is not the last chunk, then subsequent chunks in the packet are ignored DATA chunks should not be included in the same packet as an ABORT chunk The SHUTDOWN chunk is used for a graceful termination of an association If a higher-layer application or management application wants to terminate an association, then the endpoint stops sending any new data to the far end It will wait until all data sent to the far end has been acknowledged and will then send a SHUTDOWN to the far end in order to close the association The SHUTDOWN will indicate the last data chunk received from the far end The endpoint may, if necessary, retransmit user data to the far end before sending the SHUTDOWN chunk Upon receipt of a SHUTDOWN chunk, an endpoint will make sure that all the user data that it has sent has been acknowledged and, if necessary, retransmit data to the far end Once it is sure that everything it sent in the past has been received, the endpoint shall send a SHUTDOWN ACK chunk Upon receipt of the SHUTDOWN ACK, the sender of the SHUTDOWN shall respond with a SHUTDOWN COMPLETE chunk and will remove all knowledge of the association When the far end receives the SHUTDOWN COMPLETE chunk, it too will delete all knowledge of the association At this point, the association is ended
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