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ForCES Library Draft

ForCES Library Draft. Joel M. Halpern joel@stevecrocker.com. Purpose. To build a ForCES implementation that does anything, we need a set of LFB Class definitions There will be multiple documents that provide these This is intended to provide a good starting point. Structure.

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ForCES Library Draft

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  1. ForCES Library Draft Joel M. Halpern joel@stevecrocker.com

  2. Purpose • To build a ForCES implementation that does anything, we need a set of LFB Class definitions • There will be multiple documents that provide these • This is intended to provide a good starting point

  3. Structure • I have grouped the Classes into sections • Groupings are fairly arbitrary • Connectivity LFBs • Packet Valdiation & Manipulation LFBs • Classifier LFBs • Packet Control LFBs • Queue & Scheduler LFBs

  4. Connectivity LFBs • These LFBs represent the connectivity (very generally) to the external world. • This includes provision for stacking connectivity (PPP stacked on Serial Line, Frame Relay, or Ethernet) • Redirect LFB for FE-CE redirect packets • Tagged Data is envisioned for backplanes that can carry meta-data.

  5. Packet Valdiation & Manipulation • Validators, trimmers, markers, and updaters • Separates validation from classification • Some implementations will not want to validate packets being forwarded • Updaters possibly should be folded into next hop selection LFBs

  6. Classifier LFBs • Cover the different kinds of classifiers • Currently, one that considers incoming LFB port, and matches field contents from meta-data and packet contents • Separate LPM classifier • Trying to fold LPM into the general classifer structure hurt my head • Should we have different classifiers? • One that used metadata, one for packet fields

  7. Packet Control LFBs • A catch all for odd functions • These may be better dealt with by the CE for the first release • They may exercise some useful features • ICMP, ARP related functions

  8. Queue & Scheduler LFBs • Need to store and send packets • Separating queue and scheduler has been found useful in other models • Need to model the relationship • Rather awkward approach. Suggestions would be appreciated.

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