VPWS






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VPWS Business claims

Open Category: V at the beginning of the word English word English computer network

VPWS is an acronym for English Virtual Pseudo Wire Service. It is built on the infrastructure of the mpls network and provides high-speed Layer 2 transparent transmission between a pair of ports of the two routers.

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VPWS / VPWS editing

Is the English abbreviation for Virtual pseudo Wire Service, which is built on the infrastructure of the mpls network and provides high-speed Layer 2 transparent transmission between a pair of ports of the two routers.

The main components of vpws include: / VPWS Edit

Pe routers, the Mark Distribution Protocol (ldp), and the mpls Label Switched Tunnel (lsptunnel).

Principle / VPWS Edit

The pe router owns and maintains the Layer 2 transparent link information directly connected to it. Pe router is responsible for marking and de-marking common packets of VPN clients, so the pe router must be an edge marker switch router. The two ports that implement Layer 2 transparent transmission between two pe routers must be of the same type, such as Ethernet, vlan, atmvc, Frame Relay vc, hdlc, or ppp. Each pair of such ports is represented by a unique virtual link flag (vcid). Between two pe routers to define the lsp tunnel through the mpls network, lsp tunnel provides a tunnel tag (tunnellabel), in the two pe routers transparent transmission of data between. At the same time between two pe routers also need to define a direct tag distribution protocol process, used to transfer virtual link information, the most critical is to match the vcid to distribute the virtual link tag (vclabel). When a Layer 2 transparent packet enters a pe router, the pe router finds the corresponding tunnel tag and virtual link tag by matching the vcid. Pe router will be marked with this packet marked two layers, which marked the outer layer for the tunnel marker, indicating pe router from the pe path to the purpose of the inner label for the virtual link marking the pe router on the purpose of which vcid Corresponding to the router port. Pe router to monitor the two-tier protocol status on their respective ports, such as frame relay lmi or atm of the ILMI. When a fault occurs, the virtual link label is canceled by the tag distribution protocol process, thereby disrupting the two-layer transparent transmission to avoid unidirectional useless data flow. This two-layer transparent transmission mode based on mpls changes the traditional two-layer link must be achieved through the switching network restrictions, it fundamentally formed a "network of a variety of business" business model, so that operators can in a The mpls network provides both Layer 2 services and Layer 3 services.

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