Enterprise QoS Solution Reference Network Design Guide

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Provider-Edge QoS Considerations 5-20 Figure 5-9 MPLS DiffServ Uniform Tunneling Mode Policies CE Router (Ingress) PE Router IP Precedence values are copied to MPLS EXP labels by default. Direction of Packet Flow Example 5-9 shows the configuration for Uniform Mode operation on a PE. Example 5-9 PE Configuration for MPLS DiffServ Uniform Mode Tunneling Enterprise QoS Solution Reference Network Design Guide Chapter 5 MPLS VPN QoS Design ! policy-map MPLSEXP-TO-QOSGROUP class class-default set qos-group mpls experimental topmost ! Copies MPLS EXP to QoS Group ! policy-map QOSGROUP-TO-IPP class class-default set precedence qos-group ! Copies QoS Group to IPP ! … ! interface ATM2/0 no ip address no atm ilmi-keepalive ! interface ATM2/0.1 point-to-point description ATM-OC3 TO MPLS VPN CORE ! Link to/from MPLS VPN Core ip address 20.2.34.4 255.255.255.0 pvc 0/304 vbr-nrt 149760 149760 service-policy input MPLSEXP-TO-QOSGROUP ! MPLS EXP to QoS Group on ingress ! tag-switching ip ! … ! interface FastEthernet1/0 description FE TO CUSTOMER RED CE ! Link to/from CE ip vrf forwarding RED ip address 10.1.45.4 255.255.255.0 service-policy output QOSGROUP-TO-IPP ! QoS Group to IPP on egress to CE ! Verification commands: MPLS VPN P Routers The MPLS EXP value from the final label is temporarily copied to a QoS Group on ingress from the MPLS VPN cloud and then the label is popped (and discarded). (Egress) PE Router CE Router The QoS Group value is copied to the IP ToS byte on egress, setting the IP Precedence to match the last MPLS EXP value. Version 3.3
Chapter 5 MPLS VPN QoS Design Short Pipe Mode Version 3.3 Provider-Edge QoS Considerations show policy show policy interface Of course, additional QoS policies (to these Uniform Mode tunneling policies), such as queuing or WRED, can be applied on the PE-to-CE egress link (as detailed earlier in the previous section). Short Pipe Mode is utilized when the customer and service provider are in different DiffServ domains. (The service provider’s DiffServ domain begins at the ingress PE’s ingress interface and terminates on the egress PE’s ingress interface.) This mode is useful when the service provider wants to enforce its own DiffServ policy and the customer requests that its DiffServ information be preserved through the MPLS VPN cloud. Short Pipe Tunneling Mode provides DiffServ transparency through the service provider network (as does Pipe Mode). The outmost label is utilized as the single most meaningful information source as it relates to the service provider’s QoS PHB. On MPLS label imposition, the IP classification is not copied into the outermost label’s EXP. Instead, the value for the MPLS EXP is set explicitly on the ingress PE’s ingress interface, according to the service provider’s administrative policies. In the case of any re-marking occurrence within the service provider’s MPLS VPN cloud, changes are limited to MPLS EXP re-marking only and are not propagated down to the underlying IP packet’s ToS byte. Figure 5-10 shows the operation of Short Pipe Mode MPLS DiffServ tunneling. Figure 5-10 MPLS DiffServ Short Pipe Mode Tunneling Operation Assume a policer re-marks out-of-contract traffic’s topmost label to MPLS EXP 0 here. CE Router PE Router IPP3/DSCP AF31 MPLS EXP 4 Packet initially marked to IPP3/ DSCO AF31. Direction of Packet Flow Shaded area represents Provider DiffServ domain. MPLS EXP 4 IPP3/DSCP AF31 MPLS EXP values are set independently from IPP/DSCP values. MPLS VPN P Routers MPLS EXP 0 MPLS EXP 4 IPP3/DSCP AF31 Topmost label is marked down by a policer. PE Router MPLS EXP 0 IPP3/DSCP AF31 Topmost label is popped and EXP value is copied to underlying label. Unshaded areas represent Customer DiffServ domain. PE Edge (to CE) policies are based on customer markings. CE Router MPLS EXP values can be marked in any way that the provider wants to provide local significance. Figure 5-11 shows an example use of MPLS EXP markings to indicate in- or out-of-contract traffic for a five-class service-provider model. Enterprise QoS Solution Reference Network Design Guide IPP3/DSCP AF31 Original customermarked IP ToS values are preserved. 5-21
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Enterprise QoS Solution Reference Network Design Guide

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