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The Pseudo Wire (PW) is a virtual connection used to transmit frames between two PEs.
The PE establishes and maintains PWs through signaling and the two PEs on both ends of
a PW maintain the PW status.
l
VSI
Every Virtual Switch Instance (VSI) offers separate VPLS service. The VSI implements
Ethernet bridge function and terminates PW.
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VC
The Virtual Circuit (VC) is a logical unidirectional circuit between two nodes. Two opposite
directional VCs constitute a PW. A VC can be used as a unidirectional PW.
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AC
The CE accesses the PE through the Attachment Circuit (AC) . The AC can be either a
physical link or a logical link. The AC transmits frames between the CE and the PE.
The PE implements VPLS forwarding by using the VSIs. Ethernet frames are forwarded between
the PEs through the fully-connected PW.
shows the VPLS forwarding model.
Figure 7-2
VPLS forwarding model
CE
VLAN2
CE
VLAN3
CE
VLAN2
CE
VLAN3
VSI 1
VSI 2
PE
VSI 1
VSI 2
PE
PE
CE
VLAN3
CE
VLAN2
VSI 2
VSI 1
7.2 VPLS Features Supported by the S7700
Before configuring VPLS, you need to know such concepts as control plane and access plane,
flooding, packet encapsulation, VPLS access mode, HVPLS, VPLS access through VLLs, VPLS
access through static VLLs in dual-homed mode, inter-AS applications, VPLS tunnel load
balancing, MAC address learning, and IP address detection. This can help you complete the
configuration task quickly and accurately.
Quidway S7700 Smart Routing Switch
Configuration Guide - VPN
7 VPLS Configuration
Issue 01 (2011-07-15)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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