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P4P Implementation

P4P Implementation. Yale LANS. P4P Portal Services. Location Portal Service pDistance Portal Service Two services because Different functionalities Different update time-scales location large but more stable. Location Portal Service.

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P4P Implementation

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  1. P4P Implementation Yale LANS

  2. P4P Portal Services • Location Portal Service • pDistance Portal Service • Two services because • Different functionalities • Different update time-scales • location large but more stable

  3. Location Portal Service • Allows an ISP to aggregate the Internet address space to define its own “my-Internet” view • Highly preferred by ISPs during our field tests • The “my-Internet” view of an ISP consists of a set of PIDs (partition IDs)

  4. PID • A PID denotes a set of network locations • A generalization of network aggregation concepts such as autonomous system (AS) or intradomain routing area • Can denote aggregation such as • a subnet, a point of presence (PoP), a type of customers (dslvs fiber), an AS, or a set of ASes • May define hierarchical PIDs, but focus on one level so far

  5. “My-Internet” View of isp1: an Example pid4.intra.isp1 pid5.exter.isp1 pid6.exter.isp1 pid7.exter.isp1 pid1.intra.isp1 pid3.intra.isp1 pid2.intra.isp1

  6. Implementation: Interfaces Defined in the Location Portal Service • GetPID (MUST) • IP address → PID • A list of IP addresses → their corresponding PIDs • GetPIDMap (SHOULD) • PID → list of IP prefixes/ASNs belonging to the PID • A list of PIDs → their corresponding PID Maps • Null → PID Maps for all PIDs

  7. pDistance Portal Service • The pDistance Portal Service allows an ISP to define the pDistance for any given pair of network locations • network location: IP address/PID • If input is a pair of IP addresses, the ISP may either return more precise metric, or internally map IP addresses to PIDs and then return metric • pDistance: path metric distance, provider distance

  8. pDistance • Semantics of pDistance depends on • Ordinal or numerical (default) pDistance • Type of pDistance, e.g., • Routing Hop-Count pDistance • Routing Air-Mile pDistance • Routing Cost pDistance (default if not indicated)

  9. Example: Routing Cost pDistance of isp1 f(BGP local pref., AS_PATH, …) Multihoming cost opt. dual pid4 pid5 pid6 pid7 pid1 pid3 pid2 OSPF path cost; TE dual variables

  10. Implementation: Interface Defined in the pDistance Portal Service • GetpDistance (MUST) • [a pair of network locations, and optionally type of pDistance] → pDistance value • [A set of pairs of network locations and optionally type of pDistance] → pDistance values

  11. How May a P2P Application Use these P4P Portal Services? • This depends on the applications • It is a place for application innovation

  12. Example: Tracker-Based • The tracker resolves the PIDs of clients • By using PID Maps • The tracker uses a peering weight matrix to select initial peers for a new client • Peering weight matrix computed according to channel state and pDistance matrix

  13. Tracker ISP Data Structures ISPPIDMap PIDMap PIDMapPortalAPI ISPPDistanceMap PDistanceMap PDistanceMapPortalAPI ISP 1 ISP M

  14. Per Channel Data Structures • A list of ISPs maintained for the channel • An ISPView for each maintained ISP • An ISP view partitions the peers in the channel according into peer groups • A PeeringGuidance matrix guides how to select peers from the peer groups, • e.g., for a peer in peer group 1, how many peers to select from group 1, from group 2, …

  15. Per Channel Data Structures Peer Group1 PeerGroup2 Peer Group 3 Peer Group 4 isp1 ispK

  16. Per Channel Data Structures: Peer Group by PID pid1 list of clients in pid1 pid7 list of clients in pid7 peering weight matrix

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