EVPN Enhanced Mass Withdraw
draft-yu-bess-evpn-mass-withdraw-00

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BESS Workgroup                                                     T. Yu
Internet-Draft                                          January 15, 2019
Intended status: Experimental
Expires: July 19, 2019

                      EVPN Enhanced Mass Withdraw
                  draft-yu-bess-evpn-mass-withdraw-00

Abstract

   This document aims to define a enhanced mass withdraw process in case
   of multiple ES or vES fails.

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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   This Internet-Draft will expire on July 19, 2019.

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   Copyright (c) 2019 IETF Trust and the persons identified as the
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Specification of Requirements . . . . . . . . . . . . . . . .   2
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Requriments . . . . . . . . . . . . . . . . . . . . . . . . .   3
   5.  Solution Description  . . . . . . . . . . . . . . . . . . . .   3
   6.  EVPN Mass-Withdraw Community  . . . . . . . . . . . . . . . .   4
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   EVPN [RFC7432] defines a mass withdraw mechanism to efficiently and
   quickly signal to remote PE nodes in case of a connection to ES
   fails.  But there are paticular scenarios that failure of multiple
   ESs can happen listed but not limited below:

   o  ES scenario: Failue of a line-card leads to failure of multiple
      ESs.

   o  vES scenario: Failure of physical port leads to failure of
      multiple vESs aggregating EVC.

   o  vES scenario: Failure of LAG leads to failure of multiple vESs
      aggregating EVC.

   o  vES scenario: Failure of multiple MPLS NNI ports leads to failure
      of LSP and multiple vESs aggregating PWs.

   o  vES scenario: Failure of EVC leading to failure of multiple vESs.

   o  vES scenario: Failure of PW leading to failure of multiple vESs.

   o  vES scenario: Failure of line-card leads to failure of multiple
      vESs.

   This document aims to introduce a solution improving convegence
   performance in case of failure on multiple ESs.

2.  Specification of Requirements

   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 [RFC2119].

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3.  Terminology

   EVPN: BGP MPLS-Based Ethernet VPN defined in [RFC7432]

   EVI: EVPN Instance

   EVPN VPWS: Refers to [RFC8214]

   vES: Virtual Ethernet Segment
   [I-D.ietf-bess-evpn-virtual-eth-segment]

   EVC: Ethernet Virtual Circuit

   PW: Pseudowire

4.  Requriments

   (R1a): The mass withdraw mechanism MUST handle both single-active and
   active-active multi-homed ES.

   (R1b): The mass withdraw mechanism MUST handle both single-active and
   active-active multi-homed vES.

   (R1c): The mass withdraw mechanism SHOULD handle a huge number of ES/
   vES.

   (R1d): The mass withdraw mechanism SHOULD handle failure scenarios
   mentioned in section 1.

   (R1e): The mass withdraw mechanism SHOULD allowing aggregating
   sequential ESI.

   (R1f): A suppresion mechanism is requried in case flapping occours
   leading to failure of large number of ES/vES
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