Cell-Mode MPLS over ATM Overview, Configuration, and Verification
This section introduces you to cell-mode MPLS over ATM configuration. In MPLS over ATM networks, routers are connected to ATM-based provider networks consisting of ATM switches that forward data based on virtual circuits (VCs) provisioned on the ATM switches. Cell-mode MPLS uses the virtual path identifier/virtual channel identifier (VPI/VCI) fields in the ATM header as the label value.
ATM VCs exist locally (on a link between two adjacent ATM switches or two CPEs) and have two identifiers: VPI and VCI. These two identifiers are often referred to as a VPI/VCI pair. VPI and VCI numbers are part of ATM cell headers, and they are, therefore, carried in each ATM cell. Because there ...
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