Passive Interface Attribute
draft-wang-lsr-passive-interface-attribute-05

Document Type Active Internet-Draft (individual)
Authors Aijun Wang  , Zhibo Hu , Gyan Mishra 
Last updated 2020-10-20
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LSR Working Group                                                A. Wang
Internet-Draft                                             China Telecom
Intended status: Standards Track                                   Z. Hu
Expires: April 24, 2021                              Huawei Technologies
                                                               G. Mishra
                                                            Verizon Inc.
                                                        October 21, 2020

                      Passive Interface Attribute
             draft-wang-lsr-passive-interface-attribute-05

Abstract

   This document describes the mechanism that can be used to
   differentiate the passive interfaces from the normal interfaces
   within ISIS or OSPF domain.

Status of This Memo

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   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on April 24, 2021.

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   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
   3.  Consideration for flagging passive interface  . . . . . . . .   3
   4.  Prefix Attribute for Passive Interface  . . . . . . . . . . .   3
     4.1.  ISIS Prefix Attribute for Passive Interface . . . . . . .   3
     4.2.  OSPF Prefix Attribute for Passive Interface . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   7.  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .   5
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   Passive interfaces are used commonly within an operators enterprise
   or service provider networks.  One of the most common use cases for
   passive interface is in a data center Layer 2 and Layer 3 TOR(Top of
   Rack) switch where the inter connected links between the TOR switches
   and uplinks to the Core switch are only a few links and a majority of
   the links are Layer 3 VLAN Switched Virtual Interface Default
   Gateways trunked between the TOR switches serving Layer 2 broadcast
   domains.  In this scenario all the VLANs are made passive as it is
   recommended to limit the number of network LSAs between routers and
   switches to avoid unnecessary hello processing overhead.

   Another common use case is an inter-as routing scenario where the
   same routing protocol but different IGP instance is running between
   the adjacent BGP domains.  Using passive interface on the inter-as
   tiepoint connections can ensure that prefixes contained within a
   domain are only reachable within the domain itself and not allow the
   link state database to be merged between domain which could result in
   undesirable consequences.

   For operator which runs different IGP domains that interconnect with
   each other via the passive interfaces, there is desire to obtain the
   inter-as topology information as described in
   [I-D.ietf-idr-bgpls-inter-as-topology-ext].  If the router that runs
   BGP-LS within one IGP domain can distinguish passive interfaces from
   other normal interfaces, it is then easy for the router to report
   these passive links using BGP-LS to centralized PCE controller.

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