& Note:
The implementation of GE service is the same with this example except that the GE service requires EGS2 board and binding VCTRUNK to one or more VC-3s.
The Transit application of EVPL can realize the transparent transmission and forwarding of the MPLS data packet.
EPL is actually a special Transit because it can transparently transmit all services with MPLS label.
Company A has three branches in city 1, 2 and 3. Each branch can visit the other two to realize information sharing. The three branches share a 10 Mbit/s bandwidth dynamically. All Ethernet equipment of Company A can provide 100 Mbit/s Ethernet electrical interfaces and the VLAN ID is 100.
The EPLAN service can realize access and dynamic bandwidth sharing among three branches. The Ethernet board of the OptiX OSN 3500 supports Layer 2 switching of Ethernet data and supports EPLAN service through the virtual bridge (VB), as shown in Figure 4-6.
Figure 4-6 EPLAN service application
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Implementation |
Service type: EPLAN VB realizes the EPLAN application. Each NE can create at least one VB and each VB can create an MAC address table, which is updated periodically through address learning. When NE2 accesses services from branch 2, it selects a VCTRUNK based on the address table to send these services to branch 1 or 3. When NE1 accesses services from branch 1, it selects a VCTRUNK based on the address table to send these services to branch 2 or 3. |
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Hardware configuration |
Configure an EFS0 board and an EFF8 interface board in NE1 to access Ethernet service from branch 1 of Company A. Configure an EFS0 board and an EFF8 interface board in NE2 to access Ethernet service from branch 2 of Company A. Configure an EFS0 board and an EFF8 interface board in NE3 to access Ethernet service from branch 3 of Company A. For slots of EFS0 and EFF8, refer to “Appendix A Network Configuration Requirements”. |
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Service route |
NE1 |
NE2 |
NE3 |
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Company A |
VB [MAC1, VCTRUNK1] VLAN ID: 100 filtering table [MAC1, VCTRUNK1] |
VB [MAC1, VCTRUNK1, VCTRUNK2] VLAN ID: 100 filtering table [MAC1, VCTRUNK1, VCTRUNK2] |
VB [MAC1, VCTRUNK1] VLAN ID: 100 filtering table [MAC1, VCTRUNK1] |
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VCTRUNK1 and VCTRUNK2 are bound with five VC-12s respectively. |
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Protection |
The service can be protected by the SDH equipment. |
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The EPLAN service can realize multi-point dynamic sharing of the Ethernet service, conforming to the dynamic feature of data service and saving the bandwidth.
To avoid the broadcast storm, do not configure the EPLAN service as a ring. For example, configure the Ethernet service between NE1 and NE3 to pass NE2, as shown in Figure 4-6. Otherwise, the RSTP protocol should be started in the network to avoid broadcast storm.
EVPLAN adopts the MPLS technology, whose transmission efficiency is lower than EPLAN and the configuration is more complicated. Therefore, EPLAN is preferable if there is no special requirement.
Company A has three branches in city 1, 2 and 3, each branch can visit the other two to realize information sharing. So are the three branches of Company B. Though sharing the bandwidth, the services of the two companies should be isolated from each other. Both Company A and B access data with VLAN ID of 100 and both of them can provide 100 Mbit/s Ethernet electrical interface. The Ethernet equipment supports VLAN.
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