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This is a modified version of the Internet RFC suitable for machine-translating. Original version is available here: RFC40




Network Working Group                                         E. Harslem
Request for Comments: 40                                      J. Heafner
                                                                    RAND
                                                              March 1970

               
More Comments on the Forthcoming Protocol

We have recently discussed NWG/RFC Nos. 36 and 39 with Steve Crocker, UCLA. Steve has asked that we elaborate on the errors, queries, and HOST status that were mentioned in NWG/RFC #39.

Please voice your opinions soon in order to affect the forthcoming protocol specifications.

ERROR MESSAGES

<ERR> <Code> <Command length> <Command in error>

<Code> is an eight-bit field that specifies the error type. The assigned codes are shown below. <Command length> is a 16-bit integer that indicates the length of the <Command in error> in bits. The <Command in error> is the spurious command.

The ranges of <Code> are shown below in hexidecimal.

00 Unspecified error types 10-0F Resource errors 10-1F Status errors 20-2F Content errors 30-3F Unused

Specific values of <Code> are shown below with their meaning.

<Code> value Semantics

00 Unspecified errors. 01 Request for an invalid resource. 02 Request for an exhausted resource, try later.
03-0F Unused.
10 Invalid <RSM>, i.e., link connected but unblocked. 11 Invalid <SPD>. 12 Invalid <ASG>, i.e., connected but no <RDY>
received.
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     <Code> value   Semantics
13 Message received on blocked link.
14-1F Unused.
20 Unknown command code. 21 Message received on unconnected link. 22 Invalid <RFC>. 23 Invalid <CLS>. 24 Invalid <RSM>, i.e., link not connected. 25 Invalid <FND>. 26 Invalid <END>. 27 Invalid <RDY>. 28 Invalid <ASG>, i.e., not connected. 29-2F Unused. 30-FF Unused.

QUERIES

<QRY> <My Socket>
or <RPY> <Your Socket> <Text>

The <QRY> is the query indicated in NWG/RFC #39 and <RPY> is the reply. The format of <Text> is shown below; also refer to NWG/RFC #36, p. 3.

<Text>::= <16 bit count of relevant connection table entries>
<relevant connection table entries>

<relevant connection table entries>::=
<relevant connection table entries> <a relevant connection table entry> <a relevant connection table entry>

<a relevant connection table entry>::= <local socket> <foreign socket>
<link> <connection state> <flow state and buffer control> <reconnection control state>
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HOST STATUS
<NOP>

An NCP may be up, down, pending, etc. When an NCP changes its state to UP it should send a <NOP> to each remote NCP which indicates the NCP is available. The sending NCP can then construct a vector of HOST status from the RFNMs it receives. An NCP receiving a <NOP> can update the availability of the sending NCP in its HOST status vector.



[ This RFC was put into machine readable form for entry ]
[ into the online RFC archives by Richard Ames 6/97 ]




































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