
Starting ATM and ATM Router Redundancy
308612-14.00 Rev 00
2-5
A virtual channel is a logical connection between two communicating ATM
entities. Each virtual channel can carry a different protocol or traffic type. The
virtual channel transports cells that have a common identifier. The identifier is
called the virtual channel identifier (VCI) and is part of the cell header.
To add a PVC to a PVC service record, navigate to the ATM PVC service prompt
and enter:
pvc vpi
<vpi_number>
vci
<vci_number>
vpi_number
identifies the virtual path of the PVC. The header can contain a
maximum of 8 VPI bits for a UNI connection. This bit range allows for path
identifiers from 0 to 255.
vci_number
identifies the virtual channel of the PVC. The header can contain a
maximum of 16 VCI bits. This bit range allows for channel identifiers from 32 to
65535.
For example, the following command adds PVC 0/130 to the configuration on
PVC service record boston:
pvc-service/boston# pvc vpi 0 vci 130
pvc/0/130#
Note:
ATM does not allow duplicate VPI/VCI pairs on the same physical
interface (that is, on the same link module). However, duplicate VPI/VCI pairs
can exist on different physical interfaces (that is, on different link modules).
Note:
Following the recommendation of the ATM Forum, virtual channel
identifiers from 0 to 31 are reserved for signaling and added functionality.
Comentarios a estos manuales