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802.17c Protected Inter-Ring Connection

This document explains the PIRC sublayer in the MAC block diagram, with Stations A and B as the primary ring protection group, and Stations C and D as the secondary ring protection group. It also describes the PIRC sublayer logic in the path from MAC to client.

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802.17c Protected Inter-Ring Connection

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  1. 802.17cProtected Inter-Ring Connection Rafi Ram - Corrigent Systems March 2007

  2. PIRC Sublayer in MAC Block Diagram

  3. Network Diagram • Stations A & B are protection group on the primary ring • Station A is the “0” member and station B is the “1” member • Stations C & D are protection group on the secondary ring • Station C is the “0” member and station D is the “1” member

  4. PIRC Sublayer Logicon the Path MAC  Client if (bit 40 of the RPR DA is set) then if (PG state is “both active”) then if ((hash modulo result) != (member type)) then discard frame else if ((MAC is on secondary ring) and (RPR SA is the mate MAC addr)) discard frame else forward frame else if (PG state is “self down” or “hold-off”) then discard frame else forward frame else forward frame

  5. PIRC Sublayer Logic as State Table

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