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Service mappings (RFC0795)

IP.com Disclosure Number: IPCOM000003844D
Original Publication Date: 1981-Sep-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 3 page(s) / 5K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Postel: AUTHOR

Abstract

The IP Type of Service has the following fields:

This text was extracted from a ASCII document.
This is the abbreviated version, containing approximately 54% of the total text.

Network Working Group J. Postel

Request for Comments: 795 ISI

September 1981

SERVICE MAPPINGS

----------------

This memo describes the relationship between the Internet

Protocol (IP) [1] Type of Service and the service parameters of specific

networks.

The IP Type of Service has the following fields:

Bits 0-2: Precedence.

Bit 3: 0 = Normal Delay, 1 = Low Delay.

Bits 4: 0 = Normal Throughput, 1 = High Throughput.

Bits 5: 0 = Normal Relibility, 1 = High Relibility.

Bit 6-7: Reserved for Future Use.

0 1 2 3 4 5 6 7

+-----+-----+-----+-----+-----+-----+-----+-----+

| | | | | | |

| PRECEDENCE | D | T | R | 0 | 0 |

| | | | | | |

+-----+-----+-----+-----+-----+-----+-----+-----+

111 - Network Control

110 - Internetwork Control

101 - CRITIC/ECP

100 - Flash Override

011 - Flash

010 - Immediate

001 - Priority

000 - Routine

The individual networks listed here have very different and specific

service choices.

September 1981

RFC 795 Service Mappings

AUTODIN II

The service choices are in two parts: Traffic Acceptance Catagories,

and Application Type. The Traffic Acceptance Catagories can be

mapped into and out of the IP TOS precedence reasonably directly.

The Application types can be mapped into the remaining IP TOS fields

as follows.

TA DELAY THROUGHPUT RELIABILITY

--- ----- ---------- -----------

I/A 1 0 0

Q/R 0 0 0

B1 0 1 0

B2 0 1 1

DTR TA

--- ---

000 Q/R

001 Q/R

010 B1

011 B2

100 I/A

101 I/A

110 I/A

111 error

September 1981

RFC 795 Service Mappings

ARPANET

The service choices are in quite limited. There is one priority bit

that can be mapped to the high order bit of the IP TOS precedence.

The other choices are to use the regular ("Type 0") messages vs. the

uncontrolled ("Type 3") messages, or to use single ...