BGP-LS Extensions for Advertising Path MTU
draft-zhu-idr-bgp-ls-path-mtu-00

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Last updated 2018-06-30
Replaces draft-hu-idr-bgp-ls-path-mtu
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Network Working Group                                             Y. Zhu
Internet-Draft                                             China Telecom
Intended status: Standards Track                                   Z. Hu
Expires: January 1, 2019                                          G. Yan
                                                                  J. Yao
                                                     Huawei Technologies
                                                           June 30, 2018

               BGP-LS Extensions for Advertising Path MTU
                    draft-zhu-idr-bgp-ls-path-mtu-00

Abstract

   BGP Link State (BGP-LS) describes a mechanism by which link-state and
   TE information can be collected from networks and shared with
   external components using the BGP routing protocol.  The centralized
   controller (PCE/SDN) completes the service path calculation based on
   the information transmitted by the BGP-LS and delivers the result to
   the Path Computation Client (PCC) through the PCEP protocol.

   Segment Routing (SR) leverages the source routing paradigm, which can
   be directly applied to the MPLS architecture with no change on the
   forwarding plane and applied to the IPv6 architecture, with a new
   type of routing header, called SRH.  The SR uses the IGP protocol as
   the control protocol.  Compared to the MPLS tunneling technology, the
   SR does not require signaling.  Therefore, the SR does not support
   the negotiation of the Path MTU.  Since Multiple labels or SRv6 SIDs
   are pushed in the packets, it is more likely that the MTU exceeds the
   limit in the SR tunneling technology.

   This document specify the extension to BGP Link State (BGP-LS) to
   carry maximum transmission unit (MTU) messages.  The PCE/SDN
   calculates the Path MTU while completing the service path calculation
   based on the information transmitted by the BGP-LS.

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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Internet-Draft BGP-LS Extensions for Advertising Path MTU      June 2018

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Copyright Notice

   Copyright (c) 2018 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.  Deploying scenarios . . . . . . . . . . . . . . . . . . . . .   4
   3.  BGP_LS Extensions for Path MTU  . . . . . . . . . . . . . . .   5
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   [RFC7752]describes the implementation mechanism of BGP-LS by which
   link-state and TE information can be collected from networks and
   shared with external components using the BGP routing protocol
   [RFC4271].  BGP-LS allows the necessary Link-State Database (LSDB)
   and Traffic Engineering Database (TED) information to be collected

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