Virtual Channel Connections and Virtual Paths

A virtual channel connection (VCC) is a series of virtual channel links (VCLs) between two ATM points. A VCL is a means of bidirectional transport of ATM cells between a point where a virtual channel identifier (VCI) value is assigned and the point where the same value is either reassigned or terminated. The VCI identifies the VCL to which a cell belongs and determines where the cell should go next. Figure 21-6 shows the relationship between VCLs and VCCs in an ATM network.

Figure 21-6 The Relationship Between VCLs and VCCs in an ATM Network

ATM endpoint

Host

Figure 21-6 The Relationship Between VCLs and VCCs in an ATM Network

ATM endpoint

ATM endpoint

Host

ATM endpoint

Host

_Trunk

------Virtual channel connection(VCC) or

Virtual channel link (VCL)

VCCs are sometimes transported within virtual paths (VPs). A VP is identified by its virtual path identifier (VPI). VPs provide a convenient way of bundling traffic directed to the same destination or traffic requiring the same Quality of Service (QoS) in the network (see Figure 21-7).

Continue reading here: Performing Loopback Tests

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