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Networking
Company A
NE2
Company
A
3
Company
B
MAC
Desti
VC-Trunk
MAC 1
NE1
①
Company
MAC 2
NE4
②
A
MAC 3
NE2
③
...
...
...
Figure 4-8 Network topology with RSTP started
7. EPL/EVPL Service
The OptiX OSN 3500 adopts the Martini modes to construct the MPLS L2 VPN and
provides EPL/EVPL service. As shown in Figure 4-9, the system will check the Port +
Vlan ID table and add the external label (Tunnel) and internal label (VC) it gets to the
accessed Ethernet frames. Data transfer in the network is based on the external label,
which will be discarded at the Provider Routers (P) equipment at the last hop. Then,
the data will be transmitted to the corresponding Provider Edges (PE) equipment,
which transfers the data to corresponding port according to the internal label. The
OptiX OSN 3500 integrates the function of P equipment and PE equipment.
Company B
NE1
NE4
1
SHR
2
NE3
n
VC Trunk
Company
B
OptiX OSN 3500 TM - SD
Company
A
Company
B
4-7
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