BMP (BGP Monitoring Protocol) Seamless Session
draft-tppy-bmp-seamless-session-00

Document Type Active Internet-Draft (individual)
Authors Thomas Graf  , Paolo Lucente  , Pierre Francois  , Yunan Gu 
Last updated 2021-02-21
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Network Working Group                                            T. Graf
Internet-Draft                                                  Swisscom
Intended status: Standards Track                              P. Lucente
Expires: August 26, 2021                                             NTT
                                                             P. Francois
                                                               INSA-Lyon
                                                                   Y. Gu
                                                                  Huawei
                                                       February 22, 2021

             BMP (BGP Monitoring Protocol) Seamless Session
                   draft-tppy-bmp-seamless-session-00

Abstract

   This document describes an optional BMP session lifecycle extension
   to prevent data duplication of previously exported messages when TCP
   session is re-established.  It prevents loss of messages between TCP
   session re-establishments and increase overall BMP scalability.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on August 26, 2021.

Copyright Notice

   Copyright (c) 2021 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
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect

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   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  BMP Client and Server Capability  . . . . . . . . . . . . . .   3
   5.  Updated BMP Session Lifecycle . . . . . . . . . . . . . . . .   3
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   7.  Operational Considerations  . . . . . . . . . . . . . . . . .   4
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   With the constant increase of BGP paths, the increase of BMP BGP RIB
   coverage from RFC8671 [RFC8671] and draft-ietf-grow-bmp-local-rib
   [I-D.ietf-grow-bmp-local-rib], the addition of new TLVs such as
   draft-cppy-grow-bmp-path-marking-tlv
   [I-D.cppy-grow-bmp-path-marking-tlv] and draft-xu-grow-bmp-route-
   policy-attr-trace [I-D.xu-grow-bmp-route-policy-attr-trace], more BMP
   messages and BGP contexts, such as peering, route-policy or RIB, are
   exported from BMP client to server.

   With each BMP session re-establishment, clients export the initial
   BGP RIB via BMP route-monitoring messages as described in section 5
   of RFC7854 [RFC7854].  Regardless if the same messages were already
   exported in a previous BMP session or not.  This leads to data
   duplication and unnecessary strain of the BMP client and server.

   In a network most times BMP sessions are re-established within a
   short period of time due to connectivity interruption between BMP
   client and server or restart of the BMP server due to maintenance.
   Even though most BMP client implementations support a BMP buffering
   mechanism, messages are not buffered across BMP session re-
   establishment, thus leading to a loss of messages.

   Therefore, the proposed BMP session lifecycle improvement covers

   o  Brief loss of connectivity between BMP client and server

   o  Seamless Maintenance of BMP server

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   It is based on RFC7413, TCP Fast Open [RFC7413], which allows
   previously established TCP transport sessions to be re-established
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