1 / 14

OSPF Offloading: The HELLO Protocol

OSPF Offloading: The HELLO Protocol. A First Step Toward Distributed Heterogeneous Offloading Speaker: Mary Bond. Introduction: The Challenge. Traditional IP router architecture incorporates single centralized control processor Scalability issues are real

chavez
Download Presentation

OSPF Offloading: The HELLO Protocol

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. OSPF Offloading: The HELLO Protocol A First Step Toward Distributed Heterogeneous Offloading Speaker: Mary Bond

  2. Introduction: The Challenge • Traditional IP router architecture incorporates single centralized control processor • Scalability issues are real • Large amount of I/O bandwidth required across backplane

  3. The Future of Network Forwarding Devices

  4. The Protocol Offload Solution: Long Term Goal • Distribute functionality by protocol offloading to forwarding plane blades • Design a generalized framework for offloading protocols • The Approach: • Examine offloading possibilities of many routing protocols • Use collective results to design offloading framework

  5. OSPF: A Brief Overview • Link state vector algorithm • Distribute data by flooding • Amount of data passed reduced via area grouping • External data advertised, separate from link state data

  6. OSPF: A Brief Overview • HELLO packets used to acquire neighbors • HELLO protocol elects designated router • Link state ads (LSAs) reflect adjacencies • LSAs flooded reliably • Link state database is collection of LSAs from every router in area

  7. OSPF Offloading: The HELLO Protocol • Two primary OSPF data structures: • Interfaces • Neighbors • Interface algorithms: • HELLO • Designated Router Election • Neighbor algorithms: • Database Distribution • Link State Updates • Routing Table Calculation

  8. Interface and NeighborFinite State Machines

  9. Communication Between GOSPF and OOSPF • Synchronizing Data Structure Fields • Starting/Stopping HELLO Timers • Instigating FSM Transitions • Triggering Link State Advertisements • Updating Designated Router (or Backup) • Instigating sending of HELLO Packets

  10. GOSPF and OOSPF Proxies • GOSPF and OOSPF communicate via proxies • Remote procedure calls are transparent • TCP connection

  11. The RPC Class • Provides general framework for communication between proxies • Child classes inherit from RPC class, one for each remote procedure call • Child classes correspond to specific functions (called remotely) between GOSPF and OOSPF

  12. Offloaded OSPF, IXP Architecture

  13. Conclusions • Future control plane processing presents a bottleneck issue • Protocol offloading is a possible solution • This project was a first step toward studying the offloading of control plane routing protocols.

  14. Thank you!

More Related