Link Number Assignments
A short announcement of which Host-Host link numbers may be used for connections.
McKenzie, A.M., "Link Number Assignments", RFC 179, DOI 10.17487/RFC0179, June 1971, <https://www.rfc-editor.org/info/rfc179>.
@misc{rfc179,
series = {Request for Comments},
number = 179,
howpublished = {RFC 179},
publisher = {RFC Editor},
doi = {10.17487/RFC0179},
url = {https://www.rfc-editor.org/info/rfc179},
author = {A.M. McKenzie},
title = {{Link Number Assignments}},
pagetotal = 1,
year = 1971,
month = jun,
} RFC text
Network Working Group Alex McKenzie
Request for Comments No. 179 BBN
NIC No. 7119 22 June 1971
Category: C.9
Updates: 107
Obsoletes: none
LINK NUMBER ASSIGNMENTS
Today Steve Crocker asked me to announce that from now on link
numbers 2-71 (decimal), inclusive, are to be valid for use in
connections. Accordingly, the Host-Host Protocol Document, which I am
currently writing, will contain the following "declarative
specification".
Links are assigned as follows:
Link Number Assignment
0 Control link
2-71 Available for connections
1, 72-190 Reserved-not for current use
191 To be used only for measurement
work under the direction of the
Network Measurement Center at UCLA
192-255 Available for private experimental use
[ This RFC was put into machine readable form for entry ]
[ into the online RFC archives by Kai Henningsen 5/97 ]
AI ELI5
On this page
§1The Announcement
Alex McKenzie of BBN writes that Steve Crocker asked him to announce that from now on link numbers 2-71 (decimal), inclusive, are valid for use in connections. The Host-Host Protocol Document he was writing would contain the assignments below as a declarative specification.
Someone in charge said which numbered lanes can be used, and it will go in the rulebook.
§2The Link Number Table
Link 0 is the control link. Links 2 through 71 are available for connections. Link 1 and links 72 through 190 are reserved and not for current use.
Link 191 is to be used only for measurement work under the direction of the Network Measurement Center at UCLA. Links 192 through 255 are available for private experimental use.
Lane 0 is for control, lanes 2 to 71 are for everyone, a special lane is for measuring, and the highest lanes are for private tests.
- 0Control link — Used for control.
- 2-71Connections — Available for connections.
- 1, 72-190Reserved — Reserved, not for current use.
- 191Measurement — Only for measurement work directed by the Network Measurement Center at UCLA.
- 192-255Private experiments — Available for private experimental use.
§3Relation to Other RFCs
The memo lists RFC 107 as updated and is only one page long. It contains no further rationale; it simply states the assignment so implementers could rely on it.
This note is a short update to an earlier rulebook page.