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QPIM

QPIM. 49th IETF San Diego Policy WG. QoS Policy Information Model draft-ietf-policy-qos-info-model-02 Yoram Snir Yoram Ramberg John Strassner Ron Cohen. Agenda. Overview Changes from last version Examples Discussion. Overview. 4th version of QPIM Extends PCIM

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QPIM

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  1. QPIM 49th IETF San Diego Policy WG QoS Policy Information Model draft-ietf-policy-qos-info-model-02 Yoram Snir Yoram Ramberg John Strassner Ron Cohen

  2. Agenda • Overview • Changes from last version • Examples • Discussion San-Diego IETF

  3. Overview • 4th version of QPIM • Extends PCIM • IntServ & DiffServ Policy modeling • General Policy Use • DiffServ model can be translated to PIB and MIB • IntServ model can be enforced using COPS for RSVP • LDAP mapping to be updated San-Diego IETF

  4. Changes made • Separate between QoS and General PCIM extensions • Complete Diffserv modeling including PHB modeling • Remove ‘LDAP’ism and storage dependent modeling • Various improvements and changes due to feedback San-Diego IETF

  5. General PCIM extensions • Prefix General Use Classes with gps, attributes with gp • Variables and Values • Simple and Compound Conditions • Policy Containers inc. Decision Strategy • Meters and Traffic Profiles San-Diego IETF

  6. QPIM CLASSES *PCIM +QPIM General San-Diego IETF

  7. General PCIM extensions • General Associations and Aggregation to allow: • Building Simple conditions from Variables and Values • Creation of Compound reusable Conditions • Building sub-rules • Reuse of policy groups • Flexible repository reuse • Bind Traffic Profiles to Meters San-Diego IETF

  8. Diffserv PHB modeling • Model PHBs using policy rules • Example: MyDomainPHB group { If (EF) do EF-action If (AF11) do AF11-action If (AF12) do AF12-action If (AF13) do AF13-action If (default) do BE-action } San-Diego IETF

  9. Diffserv PHB modeling • Add PHB action • Add Queue Class EF-Action DropAlg Tail MaxThrsh 3Pckts EF-Queue Priority 1 MaxBW 25% AF11-Action DropAlg Red MaxThrsh 20Pckts MinThrsh 4Pckts AF1x-Queue MinBW 512Kb/s AF12-Action DropAlg Red MaxThrsh 16Pckts MinThrsh 2Pckts San-Diego IETF

  10. Diffserv PHB modeling • Alternative representation using hierarchy MyDomainPHB group { If (EF) do EF-action If (AF1x) do AF1x-action If (AF11) do AF11-action If (AF12) do AF12-action If (AF13) do AF13-action If (default) do BE-action } San-Diego IETF

  11. Diffserv PHB modeling • Hierarchical AF PHB modeling AF1x-Action DropAlg Red AF1x-Queue MinBW 512Kb/s AF11-Action MaxThrsh 20Pckts MinThrsh 4Pckts AF12-Action MaxThrsh 16Pckts MinThrsh 2Pckts San-Diego IETF

  12. Storage independence • Object references are modeled as Association and Aggregations • PolicyVariableInPolicySimpleCondition • PolicyValueInPolicySimpleCondition • PolicyConditionInCompoundCondition • PolicyRuleInPolicyRule • PolicyGroupInPolicyRule • PolicyValueConstraintsInVariable • PolicyElementInPolicyRepository San-Diego IETF

  13. Storage independence • Association and Aggregation Cont. • PolicyMeterInAction • PolicyTrfcProfileInMeter • PolicyQueueInPHBAction • PolicyConformNextAction • PolicyExcessNextAction • PolicyViolateNextAction San-Diego IETF

  14. Other additions/Changes • Add Compound Conditions - Reusable (sub) conditions. Values: XX-Servers: {1.2.33.2, boo.x.com, 3.3.34} Simple Conditions: XX-ServerTraffic: {src-ip match XX-servers} Compound Conditions: XXServerApplicationTraffic: {XX-ServerTraffic AND XX-ServerAppPorts} San-Diego IETF

  15. Other additions/Changes • Compound Conditions Cont. CompoundCondition conditionListType: CNF/DNF ConditionInCompoundCondition Group #=1 Negated=False ConditionInCompoundCondition Group #=1 Negated=False PolicyCondition PolicyCondition San-Diego IETF

  16. Other additions/Changes • PCIM: “Role: A role is a type of attribute that is used to select one or more policies for a set of entities and/or components from among a much larger set of available policies.” • “The selection process for a role combination chooses policies associated with the combination itself, policies associated with each of its sub-combinations, and policies associated with each of the individual roles in the role-combination.” San-Diego IETF

  17. Other additions/Changes • Add Role attribute defined in PCIM for a Policy Rule to gpsPolicyGroup ServerFarmRules Role = [server-farm-edge], [server-farm-backup] { If (xxx) do aaa If (yyy) do bbb } San-Diego IETF

  18. Other additions/Changes • Associate Traffic Profile to Meter (not directly to action) TrafficProfile FRCir Rate: 64kb/sec Bc: 2000bytes Be: 3000bytes Meter LocalMeter: Interval: 50msec ProvisioningAction EdgeAF: Mark: AF11 ExcessAction: Mark AF12 ViolateAction: Mark AF13 San-Diego IETF

  19. Examples • Map Policy Rules to Network Configuration GroupA: Role = [ParisEdge] { If (UDP) MinBW 30% If (TFTP) MinBW 10% If (NFS) MinBW 30% If (TCP) MinBW 60% If (HTTP) MinBW 40% If (FTP) MinBW 20%, MaxBW 60% } San-Diego IETF

  20. DataPath Ifndex ParisEdge Udp TFTP Classifier Q 10% Schd Q 30% Udp NFS Classifier Q 30% Udp Classifier Q Schd Schd Tcp HTTP Classifier Q 40% Q 60% Tcp FTP Classifier Q 20% Tcp Classifier Q Q Default Classifier Examples • Map Policy Rules to Network Configuration: DiffServ MIB representation: San-Diego IETF

  21. Discussion • Issues on WG agenda • QPIM’s Conditions vs. CIM’s Filters • Mapping to Diffserv MIB • WG missing pieces • Modeling of QoS capabilities • Binding Roles to entities • Status • Questions? San-Diego IETF

  22. Condition Modeling Goals • Extend PCIM • Extend PolicyCondition • Use PolicyConditionInPolicyRule aggregation • Modeling of Variable and Values • Reusable Values • Specify Value constraints to Variables • Add new Variables and Values without changing the structure of conditions - Add semantics without changing syntax • Flexible reuse of Conditions San-Diego IETF

  23. Mapping to Diffserv MIB • Diffserv Modeling • PHB Actions model PHBs • PR Actions model Diffserv-Edge actions • Policy Definition oriented • Three level meters - easier AF policing • Shaping in PRAction, MaxBW in PHBAction although implemented by same mechanism in Diffserv-MIB • Separate Traffic Profile from Meter. Allow reusability of traffic templates • Hierarchical rules instead of forwarding path binding San-Diego IETF

  24. Discussion • Issues on WG agenda • QPIM’s Conditions vs. CIM’s Filters • Mapping to Diffserv MIB • WG missing pieces • Modeling of QoS capabilities • Binding Roles to entities • Status • Questions? San-Diego IETF

  25. qosPolicyPRAction MeterInAction TrfcProfInMeter ConformNextAction ExcessNextAction ViolateNextAction San-Diego IETF

  26. qosPolicyPHBAction QueuInPHBAction San-Diego IETF

  27. qosPolicyRSVPAction San-Diego IETF

  28. Rule Processing Order • Rule 1 • Rule 1.2 • Rule 1.1 • Rule 4 • Rule 3 San-Diego IETF

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