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END-TO-END SERVICE LEVEL AGREEMENT CONSTRAINED PATH INSTANTIATION AND REDUNDANT PACKET DELIVERY

IP.com Disclosure Number: IPCOM000251932D
Publication Date: 2017-Dec-11
Document File: 5 page(s) / 225K

Publishing Venue

The IP.com Prior Art Database

Related People

Nagendra Kumar Nainar: AUTHOR [+3]

Abstract

There are different mechanisms available that help to achieve Internet of Things (IoT) requirements on a Software Defined Access (SDA) network. However, there are significant gaps for tying such mechanisms together with SDA for end-to-end IoT service delivery. Techniques are presented herein to identify these gaps.

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Copyright 2017 Cisco Systems, Inc. 1

END-TO-END SERVICE LEVEL AGREEMENT CONSTRAINED PATH INSTANTIATION AND REDUNDANT PACKET DELIVERY

AUTHORS: Nagendra Kumar Nainar

Carlos M. Pignataro Prashanth Patil

Rajiv Asati

CISCO SYSTEMS, INC.

ABSTRACT

There are different mechanisms available that help to achieve Internet of Things

(IoT) requirements on a Software Defined Access (SDA) network. However, there are

significant gaps for tying such mechanisms together with SDA for end-to-end IoT service

delivery. Techniques are presented herein to identify these gaps.

DETAILED DESCRIPTION

Digital Network Architecture (DNA) (e.g., Cisco DNATM) may have characteristics

that enable secured and automated fabric deployment and connectivity. Internet of Things

(IoT) solutions may be deployed over a DNA / Software Defined Access (SDA)

architecture to leverage existing benefits. Figure 1 below illustrates a dual homedindustrial

network topology that is equipped with Software Defined Access (SDA).

Copyright 2017 Cisco Systems, Inc. 2

Figure 1

The expectation is to have an end-to-end ultra-latency path with minimal or no

packet loss. There are different techniques available that help to achieve the Internet of

Things (IoT) requirement on an SDA network. For example, (1) a Path Computation

Element (PCE) in a Segment Routing (SR) network allows for rapid path instantiation; (2)

streaming telemetry tied up with the PCE permits rapid Service Level Agreement (SLA)

constrained path instantiation; and (3) IoT techniques such as Packet Replication and

Elimination (PRE) enables packet replication over different diversified paths for zero

millisecond traffic protection.

Nevertheless, there exist significant gaps for tying such example mechanisms

together with SDA for end-to-end IoT service delivery.

Copyright 2017 Cisco Systems, Inc. 3

End-to-End Diversified Path Instantiation

In most Device Level Ring (DLR) / Process Field Net (PROFINET) based networks,

Industrial Ethernet (IE) switches act as Layer 2 (L2) switches connecting the

Programmable Logic Controller (PLC) to Fabric Edge Nodes (FENs) in an SDA

architecture. When an IE switch receives an Address Resolution Protocol (ARP) / Internet

Protocol version 6 (IPv6) Neighbor Discovery (ND) request for a remote PLC, the switch

may: (1) flood the request to other L2 ports other than the ports connecting the FEN; and/or

(2) generate an extended ARP/eND request and flood it over the ports connecting the FEN.

This is illustrated in Figure 2 below.

Figure 2

Copyright 2017 Cisco Systems, Inc. 4

The IE switch may flood the E-ARP/eND request to the Virtual Port Channel (vPC),

the Multi-chassis Link Aggregation Control Protocol (mLACP) port, or both. In any case,

when the FEN receives the E-ARP for the remote PLC, this triggers a path computation

request to the PCE server. The request may carry the following details: (1) remote PLC IP;

(2) path constraint requirement; and/or (3) backup FEN node.

The FEN node may use existing Point-to-Mult...