Day3 Luento 21_Ethernet Over MPLS

8/12/2019 Day3 Luento 21_Ethernet Over MPLS

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Copyright 2007 Juniper Networks, Inc. Proprietary and Confidential www.juniper.net 1

Copyright 2007 Juniper Networks, Inc. Proprietary and Confidential www.juniper.net 1

Ethernet over MPLSTechnology and application overview

September 2007


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Copyright 2007 Juniper Networks, Inc. Proprietary and Confidential www.juniper.net 2Copyright 2007 Juniper Networks, Inc. Proprietary and Confidential www.juniper.net 2

Agenda

Why Ethernet ?Why Ethernet over MPLS ?

EoMPLS technology

VPLS

Summary


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Agenda


EoMPLS technology

VPLS

Summary


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Why Ethernet? Ethernet is cheap

Ethernet silicon, ports and devices are significantly

cheaper than any other medium Ethernet is easy to operate

Ethernet popularized the notion of plug-and-playnetworking

Ethernet is ubiquitous

Ethernet won the battle for the LAN

End users (business and residential) welcome it

Very simple control plane


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Why Ethernet?

Issues with Ethernet

No native OAM features resulting slow link failure detection and

consequently higher convergence time Host address discovery resulting bandwidth wastage (flooding)

No link state topology in the control plane (STP) , no loadbalancing between ports wasting precious links by blocking them

No inherent loop prevention mechanism

Despite the above what do we really want to keep fromEthernet The interface

The framing And

The need to decouple the native data plane (switching ) andcontrol plane (STP) from the medium to make it a truly carrierWAN technology


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Agenda


EoMPLS technology

VPLS

Summary


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Carrier Ethernet Requirements Flexible network topology One

Aggregation Network, Many Applications Network Reliability:

sub-second convergence in case of networkfailures Fast Restoration of Services Graceful Restart from hardware and

software failures of nodes Service agnostic transport and scalability

Quality of Service Wholesale Transport Network Virtualization : Residential +

Business Services Private Line, VPLS, L3 VPN,

Residential Multi-Play: Voice, Video, Data,Mobile Emulate legacy transport: Mobile, Circuit

(TDM)

Carrier Class Ethernet Criteria

Scalability Reliability Quality of Service Service Management TDM Support


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So How MPLS fits in

Leverage maturity of MPLS and its multi-protocol nature:

MPLS is multi-protocol towards transport

MPLS is multi-protocol towards the service

MPLS is key to virtualization & segmenting resources

MPLS

Services

Transport


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MPLS advantages

Robust control and data plane

Control plane discovery of addresses andtopology

ECMP, Traffic Engineering, Fast Re-route

Call Admission Control, QoS Hierarchical, scalable, service-rich, proven

One can chose the network design , service

demarcation and degree of convergence


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Agenda


EoMPLS technology

VPLS

Summary


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EoMPLS Framework Architecture

AAABSR

ISP

IP/MPLSCore

Access MENIP Service

Delivery Point

Transport

Wholesale

IPTV/VoD/Content Providers

Residential

Business

MSE/PEAggregation Distribution

Cable,FTTx,EPONWimaxWiFiRANMSAN

UNI

UNI: VLAN / S-VLAN / Ethernet Port NNI: MPLS LSP

UNI or NNI (MPLS)

- IP Control Plane- MPLS Data Plane- L2 Transport Services

Video BNG

Ethernet

MPLS (LDP, RSVP, BGP)

CPE


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Port Based EoMPLS

MPLS Backbone

Eth

erne

t

Ethernet

Ethernet

Ethern

et

Ethernet

Ethernet


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VLAN Based EoMPLS

MPLS Backbone

VLA

N-4

VLAN-

2

VLAN-2

VLAN-1

VLAN

-3

VLAN-4

VLAN-3

VLAN

-1


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Pseudo Wire Emulation

Application

Al lows Service Provider/Customers to bui ld point topoint c ircuits over MPLS core using LDP signaling

How it works?

Provider pre-provisions tunnel LSPs

Provider provis ions Virtual Circuit LSPs one per

customer site Layer 2 frame encapsulated in MPLS

Benefits

Scalable, label stacking allows for aggregation oversingle LSP

Encapsulations supported

Ethernet VLAN & Port

VLAN to VLAN VLAN port to VLAN port

Port to Port

MPLS Core

Metro Ethernet

PDUPDU 400400

LDP Signaling SessionLDP Signaling Session

Metro Ethernet

PDUPDU 400400 PDUPDU 1010 100100CWCW PDUPDU 1010 100100CWCW

VLAN 700VLAN 700

Tunnel LSPTunnel LSPVC LSPVC LSP


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Properties of PWE3 for Ethernet

Point to Point Ethernet virtual circuits Port based

Ethernet Frames are transported point to point Transparently.

VLAN Based VLAN BPDUs are not transported

VLAN to VLAN Virtual Circuits

802.1Q trunk to VLAN Circuits (Hub & Spoke)

Capabili ty to add Network VLAN (Provider VLANID)

To disambiguate the VLAN ID Allows reuse of site VLAN, site VLAN becomes localsignificance

No need to modify the site VLAN, when connecting to thenetwork


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Advantages of EoMPLS

The Edge Routers switch traffic based on port orVLAN, MAC addresses are not learnt. Highly scalable based on number of VLAN supported

by the platform.

On a Router, VLANs are interface specific, hence canscale to thousands/Ten thousands of VLANs perchassis.

Use Q in Q to scale the number of point to point Virtual

Circuits.


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Two types of service: VPWS and VPLSVPWS Virtual Private Wire Service

Makes service provider network look like a wire

VPLS Virtual Private LAN Service

Makes service provider network look like a multipoint LAN

MPLS

MPLS

L2

L2

Ethernet

Ethernet


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Agenda


EoMPLS technology

VPLS

Summary


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What is VPLS?

VPLS = Virtual Private LAN Service

VPLS is specifically oriented to ServiceProviders, as a serviceA site is wholly unaware of the details of the emulation;

all it wants is an Ethernet handoff that does the rightthing

Components are Provider devices, not customers

Customers appear to have a single broadcastdomain (LAN) connecting all the sites


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VPLS Network

Supports point-to-multipoint traffic

The MPLS core appears as a giant LAN to thecustomer:may behave like segment, hub, switch or bridge.Intra-building connectivity via Ethernet

Backbone network looksBackbone network looks

like an Ethernetlike an Ethernet

Broadcast domainBroadcast domain


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Why do customers want VPLS?

Corporate networks use Ethernet it is themost common network connection

Ethernet is fast, simple and cheap

Routing over one Ethernet is simpler and

more scalable than routing over manypoint-to-point connections: RIP can broadcast or multicast updates

OSPF and ISIS form a single adjacency per LAN

All the reasons they want Layer 2 service Familiarity, non-IP protocols, want to manage their

routing


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PP

PP

PP PE 2PE 2

VPN AVPN A

Site 3Site 3

VPN AVPN A

Site 1Site 1 VPN BVPN B

Site2Site2

VPN BVPN B

Site 1Site 1

PE 1PE 1

VPN AVPN A

Site2Site2

CECEA1A1

CECEB1B1CECEA3A3

CECEA2A2

CECEB2B2

PP

Another definition.

A private network constructed over a shared infrastructurewhich may span several metro areas

Virtual: not a separate physical network

Service: Multipoint to Multipoint Ethernet connectivity

PE 3PE 3


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VPLS Operation

Ethernet Point to Multipoint connectivity

The backbone network works like a large Switch

Advantage of Multi- Protocol IP/IPX/IPV6/ etc.

MAC addresses are learned dynamically

Sending to an unknown MAC address: Flood to allsite of the VPN

Sending to a known MAC address: Send only tothe site that contains the MAC address

Receiving data from MAC address A in site SAdd MAC address A to VFT pointing to site S

Periodically, age out unused entries from VFT


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Virtual Forwarding Table (VFT) for VPLS

2000

3000

5000 4000

MAC-1

MAC-2

MAC-3

MAC-4

MAC-5

MAC-6LAN-A 3000

From Stacked label

Virtual Forwarding Table (VFT) on PE1

LAN-A

MAC-3

Dest MAC

2000

Base label

LAN-A 3000MAC-4 2000

LAN-A 5000MAC-5 4000

LAN-A 5000MAC-6 4000

Stacked label identif ies the LAN, not the CE.

PE1

LAN-B

LAN-C


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BGP/VPLS (RFC 4761) vs. LDP VPLS (RFC 4762)

Inter-AS VPLS is under progressWell defined and proven supports forInter-AS VPLS implementation

HVPLS to manage complexity of fullmesh connectivity and to scale the

implementation. HVPLS Hub may hitMAC address scaling issue.

Well defined BGP Route Reflector methodto manage large VPLS instance and large

number of Edge devices.

All PEs with End points belonging to thatVPLS instance have to be modified

Adding new VPLS sites, only the PE onwhich the new site connected has to bemodified

New Signaling protocol, LDPSignaling and Discovery simi lar to RFC4364 BGP/MPLS Layer 3 VPN

All End points have to be manuallyidentified

End points belonging to the same VPLSinstance are auto discovered using BGP

VPLS with LDP signalingVPLS with BGP based AutoDiscovery & Signaling


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Agenda


EoMPLS technology

VPLS

Summary


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Any to Any Service Flexible EoMPLS

PEPE

PEPE

PEPE

PP

PP

PP

PEPE

InterproviderInterprovider

or CoCor CoC

Company ACompany A 4364 VPN4364 VPN

Company CCompany C L2 VPNL2 VPN

Company BCompany B EoMPLSEoMPLSVPLSVPLS

MPLS Backbone

Provider Y

802.1Q

GE

802.1Q

GE

NxT1NxT1

T1T1

T1T1

Site 1 ASite 1 A

HQ AHQ ASite 2 ASite 2 A

Factory AFactory A

OCOC--33

ATMATM

T1 FRT1 FR

T1 FRT1 FR

HQ CHQ C

Site 1 CSite 1 C

Site 2 CSite 2 CCompany DCompany D 4364 VPN4364 VPN

Company ECompany E EoMPLSEoMPLS PWE3PWE3

Metro Access

Metro Access

Metro Access

802.1Q

802.1Q

GE

GE

802.1QGE

802.1QGE


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Standards for EoMPLS

IETF

RFC 4448: Encapsulation Methods for Transport ofEthernet over MPLS Networks.

RFC 4761 VPLS using BGP Auto- Discovery &Signaling

RFC 4762 VPLS using LDP Signaling

MEF E-Line (Similar to PWE3)

E-LAN (Similar to VPLS)

Documents

Day3 Luento 21_Ethernet Over MPLS