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