Internet Engineering Task Force H. Chen
Internet-Draft R. Li
Intended status: Standards Track Huawei Technologies
Expires: November 5, 2013 G. Cauchie
N. So
Tata Communications
L. Liu
UC Davis
A. Retana
Cisco Systems, Inc.
May 4, 2013
OSPF Topology-Transparent Zone
draft-chen-ospf-ttz-05.txt
Abstract
This document presents a topology-transparent zone in a domain. A
topology-transparent zone comprises a group of routers and a number
of links connecting these routers. Any router outside of the zone is
not aware of the zone. The information about the links and routers
inside the zone is not distributed to any router outside of the zone.
Any link state change such as a link down inside the zone is not seen
by any router outside of the zone.
Status of this Memo
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This Internet-Draft will expire on November 5, 2013.
Copyright Notice
Copyright (c) 2013 IETF Trust and the persons identified as the
document authors. All rights reserved.
Chen, et al. Expires November 5, 2013 [Page 1]
Internet-Draft Topology-Transparent Zone May 2013
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions Used in This Document . . . . . . . . . . . . . . 4
3. Requirements . . . . . . . . . . . . . . . . . . . . . . . . . 4
4. Topology-Transparent Zone . . . . . . . . . . . . . . . . . . 5
4.1. Overview of Topology-Transparent Zone . . . . . . . . . . 5
4.2. An Example of TTZ . . . . . . . . . . . . . . . . . . . . 5
4.2.1. Creation of a TTZ . . . . . . . . . . . . . . . . . . 5
5. Changes to OSPF Protocols . . . . . . . . . . . . . . . . . . 7
5.1. One Bit to Indicate an Internal TTZ Link . . . . . . . . . 8
5.2. A TTZ TLV in Router Information LSA . . . . . . . . . . . 9
6. Constructing Router LSA . . . . . . . . . . . . . . . . . . . 10
7. Establishing Adjacencies . . . . . . . . . . . . . . . . . . . 11
8. Distribution of LSAs . . . . . . . . . . . . . . . . . . . . . 12
8.1. Distribution of LSAs within TTZ . . . . . . . . . . . . . 12
8.2. Distribution of LSAs through TTZ . . . . . . . . . . . . . 12
8.3. Distribution of LSAs only to Edges of TTZ . . . . . . . . 12
9. Computation of Routing Table . . . . . . . . . . . . . . . . . 13
10. Smooth Migration to TTZ . . . . . . . . . . . . . . . . . . . 13
11. Security Considerations . . . . . . . . . . . . . . . . . . . 14
12. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 14
13. Acknowledgement . . . . . . . . . . . . . . . . . . . . . . . 14
14. References . . . . . . . . . . . . . . . . . . . . . . . . . . 14
14.1. Normative References . . . . . . . . . . . . . . . . . . . 14
14.2. Informative References . . . . . . . . . . . . . . . . . . 14
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 15
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