ipsec vpi

VPI：虛擬路徑標識符 (VPI: Virtual Path Identifier)

VPI is an abbreviation of a Virtual Path Identifier. In the header of an ATM cell, it is a field of 8-bit. To set up a virtual network path for an asynchronous transfer approach, it functions as a data communication identifier.

VPI是Virtual Path Identifier的縮寫 。 在ATM信元的標題中，它是8位字段。 為了為異步傳輸方法設置虛擬網絡路徑，它充當數據通信標識符。

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Commonly, ATM cells pass through ATM switches and to spot the path or destination of the cell the VPI is used with VCI. VPI appraises the switches about the path of the cell as the cell makes a journey through the network of ATM. In Frame Relay, the role of operations of VPI is similar to the role of operations of DLCI.

通常，ATM信元會通過ATM交換機，以發現VPI與VCI一起使用的信元的路徑或目的地。 當信元經過ATM網絡時，VPI會評估有關信元路徑的開關。 在幀中繼中，VPI的作用類似于DLCI的作用。

The entire ATM cell switching network enabled by the association of VPIs works with virtual channel identifiers. Within the entire channel communication potential, ATM cells generate virtual circuits and paths which lead them to diverse networks. The virtual channel identifier alludes to the circuit/channel in use, at the same time VPI matches the suitable path to the preferred destination host.

通過VPI關聯啟用的整個ATM信元交換網絡都可以與虛擬通道標識符一起使用。 在整個信道通信潛力內，ATM信元會生成虛擬電路和虛擬路徑，從而將它們引向各種網絡。 虛擬通道標識符暗示使用中的電路/通道，同時VPI匹配到首選目標主機的合適路徑。

ATM cells allow direct and quick communication and also develop regularity and make available for use recognition at the same time organizing access control. A numeric recognition is prearranged to all the circuits and paths formed by the ATM switch; this numeric recognition is called as virtual channel identifiers and virtual path identifiers.

ATM單元可以進行直接和快速的通信，還可以發展規律性，并在組織訪問控制的同時提供使用識別。 ATM交換機形成的所有電路和路徑都預先設置了數字識別。 這種數字識別稱為虛擬通道標識符和虛擬路徑標識符。

Virtual Path: In the ATM header, the bandwidth of the communication route is reasonably classified into separate virtual paths and by using the VPI they are identified. Every virtual path is allotted a fixed quantity of bandwidth. Dynamic variation in the bandwidths of Virtual paths does not occur ahead of what has been allotted.

虛擬路徑 ：在ATM標頭中，將通信路由的帶寬合理地劃分為單獨的虛擬路徑，并通過使用VPI對其進行標識。 每個虛擬路徑都分配有固定數量的帶寬。 虛擬路徑帶寬的動態變化不會在分配之前發生。

Virtual Connection: In the ATM header, the bandwidth of a virtual path is reasonably classified into separate virtual channels by using a virtual channel identifier. Virtual channels share the bandwidth inside a virtual path dynamically which is not similar to virtual paths.

虛擬連接 ：在ATM標頭中，通過使用虛擬通道標識符將虛擬路徑的帶寬合理地劃分為單獨的虛擬通道。 虛擬通道動態共享虛擬路徑內部的帶寬，該帶寬與虛擬路徑不同。

優點 (Advantages)

• It makes a simpler network design.

  它使網絡設計更加簡單。

• It enhances network performance and consistency.

  它增強了網絡性能和一致性。

• It diminishes processing and setup timings of small connections.

  它減少了小型連接的處理和設置時間。

• It enhances the services of the network.

  它增強了網絡的服務。

Virtual Channel Connection Uses

虛擬通道連接用途

• It is used between end users.

  在最終用戶之間使用。

• It can support end-to-end user data or manage signaling between two users.

  它可以支持端到端用戶數據或管理兩個用戶之間的信令。

• It is used between an end user and a network entity.

  它在最終用戶和網絡實體之間使用。

• It is used for user-to-network control signaling.

  它用于用戶到網絡的控制信令。

虛擬路徑/虛擬通道特征 (Virtual Path/Virtual Channel Characteristics)

• Quality of service.

  服務質量。

• Specified by parameters.

  由參數指定。

• Switched and semi-permanent virtual channel connections.

  交換和半永久虛擬通道連接。

• Cell sequence of integrity.

  信元序列的完整性。

翻譯自: https://www.includehelp.com/dictionary/vpi-full-form.aspx

ipsec vpi

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