IS-IS Flooding Reduction in MSDC
draft-xu-lsr-isis-flooding-reduction-in-msdc-03
Network Working Group X. Xu
Internet-Draft Alibaba, Inc
Intended status: Standards Track L. Fang
Expires: June 24, 2021 Expedia, Inc
J. Tantsura
Apstra, Inc.
S. Ma
Juniper
December 21, 2020
IS-IS Flooding Reduction in MSDC
draft-xu-lsr-isis-flooding-reduction-in-msdc-03
Abstract
IS-IS is commonly used as an underlay routing protocol for MSDC
(Massively Scalable Data Center) networks. For a given IS-IS router
within the CLOS topology, it would receive multiple copies of exactly
the same LSP from multiple IS-IS neighbors. In addition, two IS-IS
neighbors may send each other the same LSP simultaneously. The
unnecessary link-state information flooding wastes the precious
process resource of IS-IS routers greatly due to the fact that there
are too many IS-IS neighbors for each IS-IS router within the CLOS
topology. This document proposes some extensions to IS-IS so as to
reduce the IS-IS flooding within MSDC networks greatly. The
reduction of the IS-IS flooding is much beneficial to improve the
scalability of MSDC networks.
Requirements Language
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 [RFC2119].
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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Xu, et al. Expires June 24, 2021 [Page 1]
Internet-Draft December 2020
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on June 24, 2021.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Modifications to Current IS-IS Behaviors . . . . . . . . . . 4
3.1. IS-IS Routers as Non-DIS . . . . . . . . . . . . . . . . 4
3.2. Controllers as DIS . . . . . . . . . . . . . . . . . . . 5
4. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 5
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
6. Security Considerations . . . . . . . . . . . . . . . . . . . 5
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 5
7.1. Normative References . . . . . . . . . . . . . . . . . . 5
7.2. Informative References . . . . . . . . . . . . . . . . . 6
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6
1. Introduction
IS-IS is commonly used as an underlay routing protocol for Massively
Scalable Data Center (MSDC) networks where CLOS is the most popular
topology. For a given IS-IS router within the CLOS topology, it
would receive multiple copies of exactly the same LSP from multiple
IS-IS neighbors. In addition, two IS-IS neighbors may send each
other the same LSP simultaneously. The unnecessary link-state
information flooding wastes the precious process resource of IS-IS
routers greatly and therefore IS-IS could not scale very well in MSDC
networks.
Xu, et al. Expires June 24, 2021 [Page 2]
Internet-Draft December 2020
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