Huawei OptiX OSN 7500 - Figure 6-4 Layer 2 Switching of Ethernet Service

OptiX OSN 7500
Technical Manual - System Description 6 Data Features
Huawei Technologies Proprietary
6-6
Company A
Company B
NE1
Company A
Company B
Company A
Company B
Company A
Company B
MAC Address Destinat
i
VC-Trunk
MAC 1 NE1
①
MAC 2 NE4
②
MAC 3 NE2
③
………
NE2
NE3
NE4
1
2
3
SHR
n
Traffic flow
Figure 6-4 Layer 2 switching of Ethernet service
5. EVPLAN Service
The OptiX OSN 7500 adopts the Martini MPLS Layer 2 VPN encapsulation format to
support the Ethernet virtual private LAN (EVPLAN) service.
EVPLAN service implements the multipoint-to-multipoint connection of user sites.
Users regard the EVPLAN network as a big VLAN where the user service can be
converged. As shown in Figure 6-5, when the user’s Ethernet frame (the source
address is MAC H, and the destination address is MAC A, B or C) enters the PE
equipment, the system will search the Layer 2 transfer table for the internal label (VC
label). Then, the frame is transferred to the corresponding tunnel, where it is attached
with the external label (tunnel label). Thus, different LSPs are set up according to
different addresses. The MPLS labels are switched at the LSP. And then transferred to
the corresponding PE equipment, where the tunnel and VC labels are striped. After
that, the Ethernet frame is transferred to the corresponding output port according to
the Layer 2 MAC transfer table.