Customer Network Ports
Customer Network Ports (CNPs) are edge switch ports that accept all tagged and untagged CVLAN traffic and route it over a single VMAN. A CNP is simpler to configure than a CEP, because it supports one VMAN on a physical port and requires no configuration of CVIDs. The VMAN service provider does not need to know anything about the CVLAN traffic in the VMAN. The service provider simply manages the VMAN, and the ingress CVLAN traffic is managed by the customer or another service provider. This separation of CVLAN and VMAN management reduces the dependence of the separate management teams on each other, and allows both management teams to make changes independent of the other.
NoteThe CNP term is defined in the IEEE 802.1ad standard and is also called a port-based service interface. The CNP operation is similar to a MEF 13 UNI Type 1.2, and in releases before ExtremeXOS 12.6, CNPs were known as VMAN access ports or untagged vman ports. With the addition of CEPs, the term VMAN access port is now a generic term that refers to CNPs and CEPs.
A PBN can support up to 4094 VMANs, and each VMAN can support up to 4094 CVLANs. Because each CNP connects to only one VMAN, the maximum number of customer VMANs on an edge switch is equal to the total number of switch ports minus one, because at least one port is required to serve as the PNP (Provider Network Port).