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Proposed TLA and NLA Assignment Rule (RFC2450)

IP.com Disclosure Number: IPCOM000003028D
Original Publication Date: 1998-Dec-01
Included in the Prior Art Database: 2019-Feb-11
Document File: 11 page(s) / 15K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

R. Hinden: AUTHOR

Related Documents

10.17487/RFC2450: DOI

Abstract

This document proposes rules for Top-Level Aggregation Identifiers (TLA ID) and Next-Level Aggregation Identifiers (NLA ID). This memo provides information for the Internet community.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 15% of the total text.

Network Working Group R. Hinden Request for Comments: 2450 Nokia Category: Informational December 1998

Proposed TLA and NLA Assignment Rules

Status of this Memo

This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (1998). All Rights Reserved.

1.0 Introduction

This document proposes rules for Top-Level Aggregation Identifiers (TLA ID) and Next-Level Aggregation Identifiers (NLA ID) as defined in [AGGR]. These proposed rules apply to registries allocating TLA ID’s and to organizations receiving TLA ID’s.

This proposal is intended as input from the IPng working group to the IANA and Registries. It is not intended for any official IETF status. Its content represents the result of extensive discussion between the IPng working group, IANA, and Registries.

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC 2119].

2.0 Scope

The proposed TLA and NLA assignment rules described in this document are intended for the first two years of IPv6 TLA address assignments. As routing technology evolves and we gain additional experience with allocating IPv6 addresses the procedures proposed in this document may change.

Hinden Informational [Page 1]

RFC 2450 Proposed TLA and NLA Assignment Rules December 1998

3.0 IPv6 Aggregatable Global Unicast Address Format

This document proposes assignment rules for the TLA ID and NLA ID fields in the IPv6 Aggregatable Global Unicast Address Format. This address format is designed to support both the current provider-based aggregation and a new type of exchange-based aggregation. The combination will allow efficient routing aggregation for sites that connect directly to providers and for sites that connect to exchanges. Sites will have the choice to connect to either type of aggregation entity.

While this address format is designed to support exchange-based aggregation (in addition to current provider-based aggregation) it is not dependent on exchanges for its overall route aggregation properties. It will provide efficient route aggregation with only provider-based aggregation.

The aggregatable global unicast address format as defined in [AGGR] is as follows:

| 3| 13 | 8 | 24 | 16 | 64 bits | +--+-----+---+--------+--------+--------------------------------+ |FP| TLA |RES| NLA | SLA | Interface ID | | | ID | | ID | ID | | +--+-----+---+--------+--------+--------------------------------+

<--Public Topology---> Site <--------> Topology <------Interface Identifier----->

Where

FP Format Prefix (001) TLA ID Top-Level Aggregation Identifier RES Reserved for future use NLA ID Next-Level Aggregation Identifier SLA ID Site-Level Aggregation Identifier INTERFACE ID Interface Identifier

4.0 Technical Motivation

The design choices for the size of the field...

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