ethernet service and networking application

7/29/2019 Ethernet Service and Networking Application

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HUAWEI TECHNOLOGIES CO., LTD.

www.huawei.com

Huawei Confidential

Security Level: Internal Use Only2013/3/4

Ethernet Service and

Networking Application


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HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 2

PrefaceWith the rapid development of the Internet,

various types of broadband access and

applications emerge. Meanwhile, high-speed

network interconnection is required by more andmore companies who locate their offices in

different places. Thus, the narrowband data

communication can not meet such requirement.

under such circumstances, the multi-service

transmission platform (MSTP) technology

emerges. With the MSTP technology, different

types of Ethernet services can be processed and

transmitted over the SDH platform.


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Study Guide

This course aims at the optical networkproducts, Ethernet services and Ethernet

networking application.

Before studying this course, you should learn

Data Feature Theoryfirst.

You should pay special attention to and graspthe networking application of various Ethernet

services.

In this course, you may find it difficult to set up

Ethernet networks flexibly according to the

corresponding application scenarios of

Ethernet services.


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References

OptiX OSN 1500/2500/3500/7500 Technical

Manual Networking and Application

OptiX OSN 1500/2500/3500/7500

Configuration Guide

OptiX OSN 9500 Configuration Guide

OptiX 2500+ (Metro3000) Technical Manual

Networking and Application


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Upon completion of this course, you are able to:

Understand three basic theologies of the MSTP.

Know three types of services transmitted by the

optical network transmission equipment.

Grasp three types of Ethernet services and their

corresponding application scenarios.

Distinguish various Ethernet service networking modes.

Objectives


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Contents

Ethernet Terminologies

Key MSTP Technologies

Ethernet Service Classification


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Physical Port

The Ethernet physical interface is used as the external port on the board, which

is also called client-side interface or user-side interface. Currently, the most

widely used interfaces are the 10M interface, FE and GE.

VCTRUNK

A virtual container trunk (VCTRUNK) is a transmission channel realized through

virtual containers (VCs). The VCTRUNK channel can be realized by either the

contiguous concatenation technology or the virtual concatenation technology. In

virtual concatenation, several virtually concatenated VCs are regarded as one

transmission channel.


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FE

GE

Structure of the Ethernet Unit

Collect alarms and

performance events

N

X

VC4

GFP-F

NVC12/VC3/VC4

FE

Note: Both of the external and VCTRUNK can be configured with a Tag attribute.

Port

VCTRUNK

Send

to

th

ecross-connectun

it


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Ethernet Terminologies-Tag Attribute (1)

Tag flag is used to identify the type of data packets. Three types of

Tag attributes are available: Tag aware, Access, and Hybrid.

Tag awareWhen the port is set to Tag aware, the port transparently

transmits the data packets with the VLAN ID and discards the data packets

without the VLAN ID.

AccessWhen the port is set to Access, the port attaches the PVID to the

data packets without the VLAN ID and discards the data packets with the

VLAN ID.

HybridWhen the port is set to Hybrid, the port attaches the default VLAN ID

to the data packets without the VLAN ID and transparently transmits the data

packets with the VLAN ID.


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Packet

PortTag Untag

Tag aware (In) Transmit transparently Discard

Tag aware (Out) Transmit transparently

Access (In) Discard Attach the default VLAN ID

Access (Out) Delete the VLAN ID

Hybrid (In) Transmit transparently Attach the default VLAN ID

Hybrid (Out)

If the VLAN ID is the same, strip the

VLAN ID. Otherwise, transmit the

data packets transparently.

Ethernet Terminologies-Tag Attribute (2)


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Questions

What is the difference between the physical port and the

VCTRUNK?

Which attribute should the physical port be set to when multiple

VLAN data packets need be transmitted at the opposite port?


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In this section, we learn about:

Port types of the Ethernet board used for the

transmission equipment

Attributes of the port on the Ethernet board

Basic structure of the Ethernet board

Summary


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Contents





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ConcatenationThe concatenation technology integrates virtual containers of the same granularity to

form a greater container, that is, the virtual concatenation group (VCG). In this way, the

higher bandwidth utilization is realized.

LCASThe link capacity adjustment scheme (LCAS) provides a solution for adjusting the

bandwidth flexibly and dynamically. Moreover, it provides an error tolerance mechanism

to enhance the robustness of virtual concatenation.

GFP

The Generic Framing Procedure (GFP) indicates a general mechanism where the burstEthernet services of various lengths are adapted for the SDH transmission network.



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Virtual Concatenation

The data packets are transmitted in multiple VC-4/VC-3/VC-12 channels.

Each VC-4/VC-3/VC-12 contains its own overheads.

The data transmission is supported by the source and sink nodes. At

intermediate nodes, the data is transmitted transparently.


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Adjacent Concatenation

Data packets are Transmitted in one STM-N frame.

Only one group of POH overheads are available.

The transmission must be supported by the intermediate equipment.


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Networkprocessor

MappingChip

interfaceconversion

chip

RGGI

PHY

PHY4FE

XCS

Cross-

Connect

chip

Cross-

Connect

chip

8

FE(Electrical port

Interface board

Opticalinterface

VCTRUNK Virtual Concatenation

The VCTRUNK can be regarded as the physical channel of the virtual concatenation.

The corresponding standard name is the virtual concatenation group (VCG).

Relation of the Virtual Concatenation and

VCTRUNK


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The LCAS can dynamically adjust (add, delete, or modify) the service bandwidth without affecting the

availability of the existing service.The LCAS can shield the faulty path to avoid service interruption when a physical path fails.

When the faulty members are recovered, LCAS can automatically and quickly restore the bandwidth of the

virtual concatenation group.

Link capacity adjustment scheme (LCAS) is a method for adjusting the link capacity, which is an extension of

the virtual concatenation technology that enhances the concatenation function.

MSTPO p t iX

O p t iX

Normal status

Link fault

MSTPO p t iX

O p t iX

NE1

NE1

NE2

NE2

LCAS


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GFP

The Generic Framing Procedure (GFP) provides a universal mechanism that adapts the

high-level user information flow into the transport network. The burst Ethernet frames of

different lengths are quite different SDH frames that comply with synchronization strictly.

Thus, several proper protocols are used to map Ethernet signals into SDH frames. The GFP

is one of such protocols to complete the mapping.

PayloadMPLS Header +

PayloadSDH Header

PayloadGFP Header +


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The GFP works in two modes:

The frame-mapped GFP (GFP-F) is a PDU-oriented (such as the IP/PPP, and Ethernet)processing mode.

The transparent GFP (GFP-F) is a data-coding-block-oriented (such as FC and ESCON)

processing mode.

Two Working Modes of the GFP


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Ethernet MAC Frame GFP Frame

Octets

2 PLI

2 cHEC

Octets 2 Type

7 Preamble 2 tHEC

1 Start of Frame Delimiter 0 - 60 GFP Extension Hdr 6 Destination Address (DA)

6 Source Address (SA)

2 Length/Type GFP

MAC client data Payload

Pad

4 Frame Check Sequence (FCS)

Bit # 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7

Ethernet Frame Encapsulated into

the GFP Frame

The preamble code and code in front of the

Ethernet frame are stripped off.


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C-n

GFP Frame

CoreHeader

PayloadArea

GFP Idle

Based on the HEC delimitation mode, frame length identifier and CRC capture mode, it applies

the same method that is used for the ATM, which is more effective than the special frameidentifier for delimitation.

The empty frame is used for rate adaptation, that is, encapsulating the PDU of different lengths

into the SDH frame of the certain length.

GFP Frame Encapsulated to the SDH

Frame


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Questions

The delay of the adjacent concatenation service and the delay of the

virtual concatenation service, which one is longer?

What is the main function of the LCAS?

Among the key MSTP technologies, which technology is used to

adapt the burst Ethernet signals of different lengths to the SDH frame

that keeps synchronization strictly?


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Virtual concatenation

LCAS

GFP encapsulation

Summary


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Contents





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Contents


Service overview

EPL service

EVPL service

EPLAN service

EVPLAN service


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EPL: Ethernet private line

EPLAN: Ethernet private LAN

EVPL: Ethernet virtual private line

EVPLAN: Ethernet virtual private LAN

Refer to: G.8010/Y.1306 (G.ethna)

G.8011 (G.ethsrv)

G.8012.1 (G.eota.1)

Overview


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EPL

Definition

EPL Classification

The Ethernet private line EPL, occupying a VCTRUNK bandwidth

exclusively, provides the user with the point-to-point transmission of

low delay and high security.

Point-to-Point EPLPoint-to-point transmission over the Ethernet port

Port Shared EPL Share one port with different VLAN IDs

VCTRUNK shared EPL Share one VCTRUNK with different VLAN

IDs.


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Point to Point EPL

A B

2f MS_SP Ring

T2000

NP ChainNE1

NE2

NE3

NE4

NE5

A B

PORT1 PORT2

PORT1 PORT2

VCTRUNK Service A Service B

Point-to-Point transmission without sharing


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VCTRUNK C & C(1) Service C & C(2) Service

NE1

NE2

NE3

NE4 NE5

PORT3 PORT4

C(2)C(1)

C (HQ.)

PORT3

Port Shared EPL

2f MS_SP Ring

NP Chain

T2000

Share one external port with different VLAN IDs.


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VCTRUNK Shared EPL

NE1

NE2

NE3

NE4

NE5

DPORT1

PORT2

PORT2PORT1

E

D E

2f MS_SP RingNP Chain

VCTRUNK D & D Service E & E Service

Share one VCTRUNK with different VLAN IDs

T2000


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Questions

How many types of EPL can be provided and what about theirfeatures?

Which EPL is used to separate services over the VCTRUNK?

If data packets accessed from the client side have the same VLAN ID,

is it possible to use EPL over the same VCTRUNK?


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EVPL

Definition

The Ethernet virtual private line (EVPL) is also called the VPN private line.

The advantage of EVPL is that multiple services can share a VCTRUNK

channel. In this case, one MAC port can provide several point-to-point service

connections, and such connections have the same performance in each

direction. The access bandwidth is adjustable and manageable. Services can

be converged and thus port resources can be saved.


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Comparison of the EPL and EVPL

Application EPL EVPL

Point to point Supported Supported

Port shared Supported Supported

VCTRUNK shared Supported Supported

MPLS Not supported Supported

QinQ Not supported Supported

The EVPL can realize all networking modes of the EPL. Moreover, it can

realize other modes that the EPL cannot realize.


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EVPLMPLS Concepts

MPLS network

PE

PE PIP

MPLS

LSP

P

MPLS: Multi-protocol label switching, a standardized platform of routing and switchingtechnologies

Tunnel/VC: Two types of MPLS labels, with a value range from 16 to 220

LSP: Label switching path, assigned with specific labels at different nodes; Data forwarding isbased on these labels, and the path of the data flow is called the LSP.

P/PE: Provider (P) is the internal node of an MPLS network, and provider edge (PE) is theedge of an MPLS network.


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EVPLChannel Shared and MPLS

Channel shared and MPLS labels:

Channel sharedWhen multiple users share a VCTRUNK channel, their data are

distinguished and forwarded according to VLAN IDs or MPLS labels. In this case, although

multiple users share a VCTRUNK, the users have the same quality of service as a private

line.

MPLS labels: MPLS labels are used to distinguish the data that belong to different users

when the data have the same VLAN ID in one shared channel.


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EVPL Application

SDH networkNE1 NE2

A2

A VLAN ID=11

Tunnel

VC

55

25

Tunnel

VC

55

26

VCTRUNK

OptiX OSN3500

Service link

L2 switch

B VLAN ID=11

A VLAN ID=11

B VLAN ID=11

More than one user share a VC trunk, so it is applicable to the case that multipleusers have a VLAN ID. As shown in the following figure, companies A and B share

VCTRUNK1 and have the same VLAN ID. The two companies services are

isolated by MPLS labels.


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Questions

What is the difference between EPL and EVPL?

Can EPL/EVPL be used to realize interconnections between the

headquarters and branches? If yes, how can the interconnections be

realized?


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EPLAN

Definition

The Ethernet private LAN (EPLAN) is also called Layer 2 switching service,

realizing the point-to-multipoint service connection. The access bandwidth is

adjustable and manageable, and services can be converged. Similar to EPL,

EPLAN has the advantage of high security by occupying a VCTRUNK

bandwidth exclusively.


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EPLAN Application

NE1

NE2

NE3

NE4

NE5PORT1

PORT1

F(1)

F(2)

PORT1

F(3)

VB

PORT1

VCTRUNK1

PORT1

VCTRUNK2VCTRUNK1VB

VB

PORT1

VCTRUNK1VCTRUNK

F(1) & F(2) Service

F(3) & F(2) Service

F(1) & F(3) Service

2f MS_SP Ring

T2000

The application of Ethernet private local area network (EPLAN) is shown in the following

figure. Three branches of company A can access each other, and the Ethernet board of

NE3 needs to accomplish the Ethernet Layer 2 switching function.


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EPLANMAC Address Self-Learning

Port 1

Port 2

MAC Add. Port

MACA 1

MACB 1

MACC 2

MACD 2

Layer 2 Switch

MACD MACA

MACA MACD


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EPLAN-VB/LP

VB2VB3

Data Board

PORT

LP1

LP2

LP5

LP6

VCG

VB1

LP4

VB: the Virtual bridge (VB) is used to realize the Layer 2 switching feature

of the board. One data board can configure N x VB and each VB contains

M x LP. Moreover, the data in different VB is isolated.

LP: Logical Port, the logical port of VB.


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EPLAN- Layer 2 Filtering Table

Port mountingVLAN filtering table

Layer 2 filtering table: The Layer 2 filtering table, based on the VB, is also calledthe VLAN filtering table. Filtering indicates the data of some VLAN IDs can be

forwarded among some LPs. An LP may belong to more than one VLAN filtering

table in a VB.

Mounting: By mounting ports and VCTRUNK ports to LPs in a specified VB, data

forwarding relations are established.


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ROOT

EPLANRSTP/STP

RSTP/STP: Rapid/Spanning tree protocol is used to interrupt the backup links to

eliminate Ethernet service loop in the network. When the current working link is

faulty, the protection link is activated for network communication.


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Questions

What is the advantage of EPLAN when compared with EPL?

What is the working mechanism of EPLAN?

If the current network bandwidth is insufficient and two companies

with the same VLAN ID must share one VCTRUNK, can EPLAN be

used to transmit services of two companies?


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EVPLAN

Definition

Ethernet Virtual Private LAN (EVPLAN) is used to realize multipoint-

to-multipoint service communications. The embedded MPLS

technology separates the signals among different users. Thus,

EVPLAN is a service type that cannot be realized by EPLAN.


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Comparison Between the EPLAN and EVPLAN

Application EPLAN EVPLAN

Port shared Supported Supported

VCTRUNK shared Supported Supported

MPLS Not supported Not supported

In terms of the networking mode, the EVPLAN can differ and forward data from

different users by using MPLS labels, while the EPLAN cannot perform such

function.


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EVPLAN

Configuration note:

The VCTRUNK must be

configured in the MESH structure.

NE2 NE4

EVPLAN

Internet network

NE1

NE3

C VLAN ID=11

C VLAN ID=11

A VLAN ID=22

B VLAN ID=22

Ethernet Virtual Private Local Area Network (EVPLAN) is called EVPLAN for

short. As shown in the following figure, separated by MPLS labels, services of

companies A and B share one VCTRUNK in transmission. The four branches

of company A need to access each other, and the four branches of company B

also need to access each other.


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Questions

What is the difference between EPL and EVPL?

Why the full MESH structure need be configured at the

VCTRUNK for the EVPLAN?


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Various types of Ethernet service s

Networking applications of various

Ethernet services

Summary


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In this course, we learned about:

Key MSTP technologies

Ethernet classification

Networking applications of various

Ethernet services

Summary of the Course


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Thank You

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