D-Link DXS-3600-EM-8T CLI Guide - Page 382

Usage Guideline DXS-3600 Series 10GbE Layer 2/3 Switch CLI Reference Guide Use the class-map inbound command to set the mapping from EXP to have priority for incoming packets. The inbound mapping takes effect only when trust-exp is enabled. If inbound mapping exists, it will be replaced by the last configuration. Use the class-map outbound command set the mapping from priority to EXP for outgoing packets. If outbound mapping exists, it will be replaced by the last configuration. The follows figure shows the MPLS packet forwarding flow in the device. Incoming MPLS packets 1. Pick up priority according EXP 2. Select queue according priority to CoS mapping Inbound EXP-P riority mapping table 00 11 .. . . .. 77 P riority-CoS mapping table 00 11 ... . .. 76 queues Outgoing MPLS packets 3. M odify EXP according priority to EXP mapping outbound Priority-EXP mapping table 00 11 ... . .. 77 Once MPLS packets is received, if there is an inbound EXP to priority mapping entry for the FEC, the device will assign priority according to the inbound EXP. Otherwise, the priority is assigned according to 802.1p. The device then selects a CoS queue according to the priority set in the CoS mapping rule. When the device transmits packets from the outgoing interface, if there is outbound EXP mapping, the EXP will always set the rule according to the mapping rule. If the incoming packets have an MPLS label, the EXP will not be modified. If the incoming packets don't have MPLS packets, the EXP will be set to zero. The follows table show the outbound EXP mapping summary: Incoming packet type MPLS packets No MPLS packets Any Any Outbound EXP mapping Outbound EXP setting No setting Same as incoming EXP No setting 0 Mapping doesn't care about priority Set to specified EXP for all matched packets Mapping specify priority to Set to specified EXP only EXP for priority matched packets. If there is an outbound setting that maps a priority to an EXP and another setting that maps all priorities to other EXPs, the setting that maps the specified priority has higher priority. For example: 1 Class-map outbound priority 1 EXP 6. 2 Class-map outbound EXP 3. Apply the QoS policy to FEC 10.1.1.0/24. Then if the outgoing MPLS packets for the FEC have priority 1, the EXP will be set to 6. The EXP of other packets for the FEC will be set to 3. Use the no class-map inbound command to remove all inbound class-map settings. Use the no class-map outbound command to remove all outbound classmap settings. 374