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QoS in PPPoE

QoS in PPPoE. Quality of Service in the Point-to-Point Protocol over Ethernet Master’s Thesis Patrik Lahti KTH, Telia Research AB. Outline. Introduction Quality of Service Point-to-Point Protocol over Ethernet Background and Model Problem Definition

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QoS in PPPoE

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  1. QoS in PPPoE Quality of Service in the Point-to-Point Protocol over EthernetMaster’s ThesisPatrik LahtiKTH, Telia Research AB

  2. Outline • Introduction • Quality of Service • Point-to-Point Protocol over Ethernet • Background and Model • Problem Definition • QoS in the PPPoE-based Broadband IP Access. • Stability and Performance of PPPoE • Summary, Questions & Credits QoS in PPPoE

  3. Enhance the network with the intelligence to treat traffic according to application requirements. Delay Delay variation Loss Others... IP Differentiated Services Integrated Services Ethernet Priorities (802.1p) Subnet Bandwidth Manager Quality of Service QoS in PPPoE

  4. Point-to-Point Protocol over Ethernet • Purpose • To set up Client to Access Concentrator relationship • Encapsulate PPP, and multiplex multiple PPPoE sessions • Operation • Simple Active discovery • Session QoS in PPPoE

  5. Client AC Client AC LCP Auth IPCP IP data PPP/PPPoE QoS in PPPoE

  6. Outline • Introduction • Quality of Service • Point-to-Point Protocol over Ethernet • Background and Model • Problem Definition • QoS in the PPPoE-based Broadband IP Access. • Stability and Performance of PPPoE • Summary, Questions & Credits QoS in PPPoE

  7. Background& Model • CPN • VLAN • IP Access Node • New Services => QoS • NSP selection • Protocols QoS in PPPoE

  8. NSP selection IP address allocation Reuse of Legacy Equipment Unified Model (Bridged ADSL) Familiar to users Per user access control and billing Overhead and Connection delay(?) Software update for Clients QoS issues unresolved (?) Why PPP/PPPoE? QoS in PPPoE

  9. Outline • Introduction • Quality of Service • Point-to-Point Protocol over Ethernet • Background and Model • Problem Definition • QoS in the PPPoE-based Broadband IP Access. • Stability and Performance of PPPoE • Summary, Questions & Credits QoS in PPPoE

  10. Problem Definition • With what methods can QoS be support be introduced in PPPoE? • Can services with different QoS requirements be multiplexed in one PPPoE session? • Does PPP/PPPoE cope with loss, delay, reordering, and duplication? • How is performance affected by PPP/PPPoE? • What issues have to be addressed in the IP access? QoS in PPPoE

  11. Outline • Introduction • Quality of Service • Point-to-Point Protocol over Ethernet • Background and Model • Problem Definition • QoS in the PPPoE-based Broadband IP Access. • Stability and Performance of PPPoE • Summary, Questions & Credits QoS in PPPoE

  12. QoS in the PPPoE-based Broadband IP Access. • IP Differentiated Services • Guaranteed Service • Low Delay • Low Loss • Best Effort • Ethernet User Priorities, 802.1p • 7 Traffic types: NC, Voice, Video, Controlled Load, Excellent Effort, BE, Background • PPP/PPPoE? QoS in PPPoE

  13. QoS • PPPoE • Service Name Tag, request certain DS or Service. • Allows CAC • Integrate with/similar to SBM? • One session/service or DSCP • PPP • DiffServ SLA negotiation • Allows CAC • Fragmentation (slow link) QoS in PPPoE

  14. QoS scope QoS QoS in PPPoE

  15. Mapping DS to 802.1p Static Hint in DS field SBM Recommendation: Static Proposed mapping No change to PPP/PPPoE QoS QoS in PPPoE

  16. Multiplexing QoS • Alternatives • One PPPoE session/NSP • One PPPoE session/DS class • One PPP session/DS class QoS in PPPoE

  17. Outline • Introduction • Quality of Service • Point-to-Point Protocol over Ethernet • Background and Model • Problem Definition • QoS in the PPPoE-based Broadband IP Access. • Stability and Performance of PPPoE • Summary, Questions & Credits QoS in PPPoE

  18. Stability and Performance of PPPoE • Stability • Loss • Delay • Reorder • Duplication • Performance • Connection delay • Maximum throughput QoS in PPPoE

  19. Stability • Lab QoS in PPPoE

  20. Stability • Result • PADS, PAP Authentication sensitive to loss • Old LCP, IPCP packet Ids not ignored • TCP segment size smaller than necessary • Termination and Link maintenance • Delays < 3s QoS in PPPoE

  21. Performance • Lab • 10Mbps FD • 1Mbps HD • 9 Mbps Load w/wo VLAN • Connection Delay QoS in PPPoE

  22. Results No significantdifference Except on1Mbps HD ConnectionDelay ~7s Can be optimised to ~1s Performance QoS in PPPoE

  23. Outline • Introduction • Quality of Service • Point-to-Point Protocol over Ethernet • Background and Model • Problem Definition • QoS in the PPPoE-based Broadband IP Access. • Stability and Performance of PPPoE • Summary, Questions & Credits QoS in PPPoE

  24. Summary • QoS can be incorporated in the PPPoE architecture without changes to protocol standards. • PPPoE implementation to set Ethernet user priorities according to IP DS. • Simple multiplexing should be used, one PPPoE session/NSP. • PPP/PPPoE is reasonably stable and performs well. Some issues to be further investigated and improved. QoS in PPPoE

  25. Opposition • ... QoS in PPPoE

  26. Questions • ? QoS in PPPoE

  27. Thank you! • Tack till Fredrik Roos, Stefan Sandell • Alla på Bredbandsnät, Telia Research AB • Tack till Björn Pehrson och Mikael Lind • Tack till alla som kom. QoS in PPPoE

  28. Information • http://www.e.kth.se/~e95_pla/exjobb • Still have my opposition to do. • I am currently working at Nortel Networks’ Routing Architecture Lab:patrik.lahti@nortelnetworks.com QoS in PPPoE

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