Network Working Group Bill Duvall
Request for Comments: 2 SRI
[unknown title]
[page 1 missing]
1 LINKS
1a Control Links
1a1 Logical link 0 will be a control link between any two HOSTs on
the network
1a1a Only one control link may exist between any two HOSTs on
the network. Thus, if there are n HOSTs on the network, there
are n-1 control links from each HOST.
1a2 It will be primarily used for communication between HOSTs for
the purposes of:
1a2a Establishing user links
1a2b Breaking user links
1a2c Passing interrupts regarding the status of links and/or
programs using the links
1a2d Monitor communication
1a3 Imps in the network may automatically trace all messages sent
on link 0.
1b Primary Links
1b1 A user at a given HOST may have exactly 1 primary link to each
of the other HOSTs on the network.
1b1a The primary link must be the first link established
between a HOST user and another HOST.
1b1b Primary links are global to a user, i.e. a user program
may open a primary link, and that link remains open until it is
specifically closed.
Duvall [Page 1]
RFC 2
