Chapter 1: Configuration Configuring IP and Ethernet interfacesPage 1-47VLAN ID RemarkingSM supports the ability to re-mark the VLAN ID on both upstream and downstream VLAN frames at theEthernet interface. For instance, a configuration can be added to re-mark VLAN ID ‘x’ to VLAN ID ‘y’ asshown in Table 12. AP does not support VLAN ID remarking.Table 12 VLAN Remarking ExampleVLAN frame direction RemarkingUpstreamSM receives VLAN ID ‘x’ frame at the Ethernet interface, checks theconfiguration and re-marks to VLAN ID ‘y’. So VLAN ID ‘y’ frame comesout of AP’s Ethernet interface. When SM re-marks, a dynamic entry inVLAN membership table for ‘y’ is added to allow reception of VLAN ID‘y’ downstream packet.DownstreamAP receives VLAN ID ‘y’ frame at the Ethernet interface and sends to SM.SM accepts the frame as it has an entry in the membership table and re-marks to VLAN ID ‘x’. This reverse re- marking is necessary because thedownstream devices do not know of re-marking and are expecting VLAN‘x’ frames. This remarking is done just before sending the packet out onEthernet interface.802.1P RemarkingAP/BHM and SM/BHS allow re-marking of 802.1p priority bits for the frames received at the Ethernetinterface. Priority bits are not re-marked for the packets sent out of Ethernet interface (reversedirection).Configuration must be added at SM/BHS for upstream frames and at AP/BHM for downstream frames.VLAN Priority Bits configurationVLAN Priority Bits Configuration feature allows the user to configure the three 802.1p bits uponassigning VLAN to an ingress packet. The priority bits configuration is available for:• Default Port VID• Provider VIDs• MAC Address mapped Port VID• Management VIDDefault Port VIDThis VID is used for untagged frames and will correspond to the Q-Tag for 802.1Q frames (if VLANPort Type is Q), or the C-Tag for 802.1ad frames (if the VLAN Port Type is QinQ).The priority bits used in the Q-tag/C-tag are configurable.
