Mobile Backhaul I Quality of Service

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  Quality of Service The Cisco FMC system uses a Differentiated Services (DiffServ) QoS model across all network layers of the transport network in order to guarantee proper treatment of all services being transported. This QoS model guarantees the service-level agreement (SLA) requirements of all residential, business, and mobile backhaul services across the transport network. QoS policy enforcement is accomplished with flat QoS policies with DiffServ queuing on all Network-to-Network Interfaces (NNIs), and with H-QoS policies with parent shaping and child queuing on the UNIs and interfaces connecting to microwave access links. The aggregate QoS policies implemented on the NNIs of the transport network are covered in the QoS chapter of the FMC 2.0 Transport Implementation Guide. This chapter covers the QoS policies implemented on the UNIs of the CSG and MTG, covering the service-level QoS for TDM, ATM, and L3VPN services. This QoS model guarantees the SLA requirements of TDM circuits, ATM classes of service (CoS), and various LTE QoS class identifier (QCI) values that correspond to different traffic types (voice, video, etc.) with varying resource types (constant bit rate [CBR], variable bit rate real time [VBR-rt], variable bit rate nonreal time [VBR-nrt], unspecified bit rate [UBR] for ATM; and guaranteed bit rate [GBR] or non-GBR for LTE).   Tech Tip IEEE 1588v2 PTP traffic is marked with a differentiated services code point (DSCP) of 46 by the grandmaster and thus receives expedited forwarding (EF) per-hop behavior (PHB) treatment across the transport network. QoS policy enforcement is accomplished with H-QoS policies with parent shaping and child queuing on the UNIs. The classification criteria used to implement the DiffServ PHBs is covered in the FMC 2.0 Design Guide.  Figure 1   DiffServ QoS Domain  Figure 2   QoS Enforcement Points In the preceding figure, the following elements are covered in this section:   (a) H-QoS policy map on CSG UNIs   (b) H-QoS policy map on pre-aggregation NNI connecting the microwave access network   (4) Flat QoS policy map on ingress for ATM and TDM UNIs Tech Tip The values of all policer rates and shaper rates in these examples are simply there to show how policers and shapers are configured. The actual values to be deployed in a production network should be modeled after the actual traffic rates that will be encountered. CSG QoS Configuration Class Maps   QoS classification at the UNI in the ingress direction for upstream traffic is based on IP DSCP, and the marking is done by the connected eNodeB. !***Network management traffic*** class-map match-any CMAP-NMgmt-DSCP match dscp cs7 ! !***Voice/Real-Time traffic*** class-map match-all CMAP-RT-DSCP match dscp ef ! !***Broadcast Video traffic*** class-map match-any CMAP-Video-DSCP match dscp cs4   QoS classification at the UNI in the egress direction for downstream traffic is based on QoS groups, and the QoS group mapping is done at the ingress NNI.   QoS classification at the NNI in the egress direction is based on QoS groups, and: o  QoS group mapping for upstream traffic is done at the ingress UNI.  o  QoS group mapping for traffic transiting the access ring is done at the ingress NNI. !***Network management traffic*** class-map match-any CMAP-NMgmt-GRP match qos-group 7 ! !***Network control traffic*** class-map match-any CMAP-CTRL-GRP match qos-group 6 ! !***Voice/Real-Time traffic*** class-map match-all CMAP-RT-GRP match qos-group 5 ! !***Broadcast Video traffic*** class-map match-any CMAP-Video-GRP match qos-group 4 eNodeB UNI QoS Policy Map   Upstream traffic: Flat QoS policy map with policing applied in the ingress direction.   Downstream traffic: H-QoS policy map with parent shaper and child queuing applied in the egress direction. !***QoS enforcement point (a).*** !***Interface connecting eNodeB.*** interface GigabitEthernet0/2 service-policy output PMAP-eNB-UNI-P-E service-policy input PMAP-eNB-UNI-I ! policy-map PMAP-eNB-UNI-I class CMAP-RT-DSCP police cir 20000000 set qos-group 5 class CMAP-NMgmt-DSCP police 5000000 set qos-group 7 class CMAP-Video-DSCP police 100000000   set qos-group 3 class class-default police 200000000 ! ! policy-map PMAP-eNB-UNI-P-E class class-default shape average 425000000 service-policy PMAP-eNB-UNI-C-E ! policy-map PMAP-eNB-UNI-C-E class CMAP-RT-GRP priority percent 5 class CMAP-NMgmt-GRP bandwidth percent 1 class CMAP-HVideo-GRP bandwidth percent 25 class class-default TDM CEM UNI QoS Policy Map This shows how to apply the proper Experimental bits (EXP bits) marking for a TDM Circuit Emulation over Packet (CEoP) service on a Cisco ASR 901 Series router. A simple service policy is applied to the CEM interface to impose the correct QoS group, which is mapped to the corresponding EXP value on egress on the NNI. No downstream QoS configuration is required. policy-map PMAP-TDM-UNI-I class class-default set qos-group 5 interface CEM0/0 service-policy input PMAP-TDM-UNI-I PAN Configuration for ATM and TDM UNIs  ATM CEoP UNIs were validated on the Cisco ASR 903 Series platform fulfilling the PAN role in the Cisco FMC system. This shows how to properly mark the EXP value for a particular  ATM PVC on the Cisco ASR 903 Series router. policy-map PMAP-ATM-PVC-I class class-default set mpls experimental imposition 5
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