Ethernet Service Networking. Transparent Transmission. Shared VCTRUNK. Ingress/Egress. Resilient Packet Ring

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Contents

4 Ethernet Service Networking                                                          4-1

4.1 EPL                                                                                            4-2

4.1.1 Transparent Transmission                                                    4-2

4.1.2 Shared MAC                                                                       4-3

4.1.3 Shared VCTRUNK                                                              4-5

4.2 EVPL                                                                                          4-7

4.2.1 Ingress/Egress                                                                    4-7

4.2.2 Transit                                                                                4-9

4.3 EPLAN                                                                                      4-11

4.4 EVPLAN                                                                                   4-13

4.5 Resilient Packet Ring                                                                 4-16

4.5.1 EVPL                                                                                4-16

4.5.2 EVPLAN                                                                           4-19

4.6 Ethernet Service Protection                                                        4-24

4.6.1 TPS Protection for FE Service                                            4-24

4.6.2 LCAS                                                                               4-24

4.6.3 CAR                                                                                 4-25

4.6.4 RSTP                                                                               4-26

4.6.5 Flow Control                                                                     4-26

4.6.6 RPR                                                                                 4-26


Figures

Figure 4-1 EPL service application (transparent transmission)                          4-2

Figure 4-2 EPL service application (convergence)                                           4-3

Figure 4-3 EPL service application (shared VCTRUNK)                                   4-5

Figure 4-4 EVPL service application (shared VCTRUNK)                                 4-7

Figure 4-5 Transit application                                                                         4-9

Figure 4-6 EPLAN service application                                                           4-11

Figure 4-7 EVPLAN service application                                                        4-13

Figure 4-8 EVPL application on RPR                                                            4-17

Figure 4-9 EVPLAN application on RPR                                                       4-20

Figure 4-10 The TPS principle of the EFS0                                                   4-24

Figure 4-11 LCAS adjusts bandwidth dynamically                                          4-25

Figure 4-12 LCAS protects the concatenation group                                      4-25

Figure 4-13 Flow control at the Ethernet side                                                4-26

Figure 4-14 Bidirectional RPR                                                                      4-27

Figure 4-15 Wrapping of RPR                                                                      4-27

Figure 4-16 Steering of RPR                                                                        4-28


4 Ethernet Service Networking

This chapter illustrates network planning for Ethernet services through actual networking implementation of a variety of Ethernet services. It includes:

n  EPL

n  EVPL

n  EPLAN

n  EVPLAN

n  Resilient packet ring

n  Ethernet service protection

& Note:

The MSTP equipment supports four types of Ethernet services.

n  Ethernet private line (EPL)

n  Ethernet virtual private line (EVPL)

n  Ethernet private LAN (EPLAN)

n  Ethernet virtual private LAN (EVPLAN)


4.1  EPL

The EPL service realizes the point-to-point connection and service convergence.

4.1.1  Transparent Transmission

1.  Service Requirement

Company A (hereinafter called A) and Company B (hereinafter called B) in city 1 need to transmit data services to city 2 through an MSTP equipment. The services of A must be isolated from that of B. Both A and B can provide 100 Mbit/s Ethernet electrical interfaces. A requires a bandwidth of 10 Mbit/s and B 45 Mbit/s.

2.  Application

In this example, the OptiX OSN 3500 can realize the transparent transmission of services between NE1 and NE2. Figure 4-1 shows the networking diagram.

Figure 4-1 EPL service application (transparent transmission)

In city 1, services of A and B are accessed through MAC ports of NE1. In city 2, services of A and B are accessed through MAC ports of NE2.

On the line, the service of A is transmitted over a VCTRUNK, and that of B is over another VCTRUNK.

3.  Implementation

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