Avaya Configuring ATM and MPLS Services Uživatelský manuál stáhnout pdf (Strana 35)

100

101

Understanding ATM, MPOA, ATM Router Redundancy, and OAM

117374-C Rev 00

1-5

A virtual path is a set of virtual channels between a common source and

destination. The virtual channels in a virtual path are logically associated with a

common identifier, the virtual path identifier (VPI), that is part of the cell header.

You can base cell switching on either the VPI alone, or on a combination of the

VPI and VCI.

Virtual paths enable you to separate network transport functions into those related

to an individual logical connection (virtual channel) and those related to a group

of logical connections (virtual path).

A transmission path is a physical connection that comprises several virtual paths,

each virtual path containing several virtual channels. The transmission path can

support multiple virtual paths across a single connection to the network.

Figure 1-3

shows the relationships between the virtual channel, the virtual path,

and the transmission path.

Figure 1-3. ATM Transmission Components

Transmission Path

VP = Virtual path

VC = Virtual channel

ATM0006A

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