RFC604 - Assigned link numbers

Network Working Group Jon Postel

RFC# 604 MITRE

NIC # 21186 26 December 1973

Assigned Link Numbers

This announcement modifies the official host-to-host protocol, and

updates the defining documents [NIC 8246, NIC 9347]. Please note that

the information on page 28 of "Host/Host Protocol for the ARPA Network"

about link number assignments is updated by this note, and that a

previous update [RFC317, NIC 9347] is completely replaced. The

modification is minor and should have no effect on existing network

programs or usage. Four of the reserved link numbers are hereby

assigned for eXPerimental use in the testing of an internetworking

protocol defined by Kahn and Cerf.

Description:

Control Link

Link 0 is assigned for use as the host-to-host protocol control

link.

Data Links

Links 2-71 are available for use in connections as provided by

the host-to-host protocol.

Internetworking Protocol

Links 155-158 are to be used for experiments with the

Internetworking Protocol.

Measurements

Links 159-191 are assigned for use in measurements under the

direction of the Network Measurement Center at UCLA.

Message Switching

Links 192-195 are to be used for experiments with the Message

Switching Protocol.

Private Experiments

Links 196-255 are available for private experimental use.

Reserved

Link 1, and links 72-154 are reserved for future developments

and experiments and currently are not to be used.

Table:

Link Number Assignment

0 Control Link

1 Reserved

2-71 Connections

72-154 Reserved

155-158 Internetworking Protocol

159-191 Measurements

192-195 Message Switching Protocol

196-255 Experimental

References:

Host-to-host Protocol NIC 8246

Internetworking Protocol NIC 18764

Message Switching Protocol NIC 9926

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