1-4Basic Concepts of VLAN MappingFigure 1-1 Basic concepts of VLAN mappingBefore you configure VLAN mappings, be aware of the following concepts, which will be usedthroughout this document.z Uplink traffic: Traffic transmitted from a user network to a distribution network or an SP network.z Downlink traffic: Traffic transmitted from a distribution network or an SP network to a user network.z Uplink port: A port transmitting uplink traffic and receiving downlink traffic.z Downlink port: A port transmitting downlink traffic and receiving uplink traffic.z Uplink policy: A QoS policy containing VLAN mappings for uplink traffic.z Downlink policy: A QoS policy containing VLAN mappings for downlink traffic.How VLAN Mapping Is ImplementedThis section describes how VLAN mapping is implemented on your device.One-to-one VLAN mappingOn the downlink portFor uplink traffic For downlink trafficDo… Based on… Do… Based on…Replace thecustomer VLAN(CVLAN) with theservice providerVLAN (SVLAN)Uplink policy in theinbound directionReplace the SVLANwith the originalCVLANDownlink policy in theoutbound direction
