Ethernet Service Networking. Transparent Transmission. Shared VCTRUNK. Ingress/Egress. Resilient Packet Ring, страница 4

2. Application

EVPL service can realize the above requirements since the VLAN IDs of the two departments are the same and they need to share the bandwidth. The EVPL service adopts Martini multiprotocol label switching (MPLS) Layer 2 VPN encapsulation, and supports identification of external label (Tunnel) and internal label (VC).

The OptiX OSN 3500 can realize the above service requirements, as shown in Figure 4-4.

Figure 4-4 EVPL service application (shared VCTRUNK)

3. Implementation

Implementation	Port route + MPLS route Add MPLS label to services since the two departments share one VLAN and the bandwidth. In city 1, services of M&S department and technical support department are accessed through MAC1 and MAC2 of NE1 respectively, added with different MPLS labels (Tunnel label and VC label). After converging by the Ethernet board, all services are sent to city 2 over a VCTRUNK. In city 2, the Ethernet processing board of NE2 processes services from city 1 and send them to the two departments in city 2 respectively based on the MPLS label.
Hardware configuration	Configure one EFS4 board in NE1 to access Ethernet services from M&S and technical support departments. Configure one EFS4 board in NE2 to access Ethernet services from M&S and technical support departments. For slots of the EFS4 board, refer to “Appendix A Network Configuration Requirements”.
Service route		NE1	NE2
	Technical support department	MAC1 ïð VCTRUNK1 + MPLS label 1	VCTRUNK1 + MPLS label 1 ïð MAC1
	M&S department	MAC2 ïð VCTRUNK1 + MPLS label 2	VCTRUNK1 + MPLS label 2 ïð MAC2
	Bind VCTRUNK1 to five VC-12s
Protection	The service can be protected by the SDH equipment.

& Note:

You can apply the same principles to implementation of GE services except that the GE service requires EGS2 board and binding VCTRUNK to one or more VC-3s.

4. Summary

EVPL service supports dual isolation through VLAN ID and MPLS label, realizing service isolation among different users and different departments of one user. That is, EVPL service can isolate data with the same VLAN ID on the same link.

However, EVPL requires complicated configuration but offers lower transmission efficiency. Therefore, EPL is preferable unless there is special requirement.

4.2.2 Transit

1. Service Requirement

Company A has branch 1 in city 1 and branch 2 in city 2, between which data service is transmitted. The MSTP equipment interconnects with a router that supports MPLS and the data packet to be transmitted with the MPLS label. The MSTP equipment should only transmit the MPLS data packet over the 10 Mbit/s bandwidth. Company A can provide the 100 Mbit/s Ethernet electrical interface.

2. Application

The OptiX OSN 3500 can realize the transparent transmission of MPLS packet between two branches. Figure 4-5 shows the networking diagram.

Figure 4-5 Transit application

The Transit application of EVPL can realize the transparent transmission of the MPLS data packet.

3. Implementation

Implementation	Service type: EVPL Port route + Transit LSP In this application, all logical ports of NE1 and NE2 (including MAC and VCTRUNK) are set to “P” port, LSP operation type is “Transit” and the MPLS data is transmitted transparently after label switching.
Hardware configuration	Configure an EFS4 board in NE1 and NE2 respectively to access the MPLS data service of Company A. For slots of the EFS4 board, refer to “Appendix A Network Configuration Requirements”.
Service route		NE1	NE2
	Company A	MAC1 + MPLS label 1 ïð VCTRUNK1 + MPLS label 2	VCTRUNK1 + MPLS label 2 ïð MAC1 + MPLS label 1
		Bind VCTRUNK1 to five VC-12s The OptiX OSN 3500 only supports switching of Tunnel label.
Protection	The service can be protected by the SDH equipment.

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