COMMENTS ON PROTOCOL RE: NWG/RFC #36 We offer the following suggestions to be considered as additions to the April 28th 1970 protocol grammar specifications. ERROR MESSAGES It is desirable to include debugging aids in the initial protocol for checking out Network Control Programs, etc. There are three classes of errors--content errors, status errors, and resource allocation or exhaustion. specifies the class and the offending member of the class. The command is returned to the sending NCP for

more »

... entification and analysis. Examples of status errors are: messages sent over blocked links and attempts to unblock an unblocked link. Examples of content errors are: an invalid RFC complete; a message sent on a link not connected; closing of an unconnected link; and an attempt to unblock an unconnected link. Examples of resource errors are: a request for a non-existent program and connection table over-flow, etc. Resource errors should be followed by a in response to the . QUERIES < > or Queries provide an extension to the facility as well as limited error recovery, thus avoiding re-initialization of an NCP. The first command requests the remote NCP to supply the status of all connections to the user specified by the user number in .