1. Enhancements to Ethernet AIS David Elie Dit Cosaque, Kamakshi Sridhar, Maarten Vissers, Tony Van Kerckhove

2. IEEE 802.1 July 11-16, 2004 — 2 Introduction > Proposals for essential EthAIS functions > EthAIS Coalescing > EthAIS accurate alarm suppression

3. IEEE 802.1 July 11-16, 2004 — 3 Multiple lower level faults result in multiple EthAIS >Excessive bandwidth consumption Problem I: EthAIS cascading PE2 12 34 12 34 C2 12 34 CE4 12 34 CE3 12 34 C1 12 34 CE1 PE1 12 34 PE3 12 34 PE4 12 34 P1 12 34 12 34 CE2 P3 12 34 P2 12 34 Fault1 Fault2 Two EthAIS received

4. IEEE 802.1 July 11-16, 2004 — 4 Benefits: >The bandwidth taken by EthAIS at each level is independent of the number of faults at lower levels >No change in AIS frame format required. Solution: EthAIS Coalescing > Solution: coalesce EthAIS in the MPs. Multiple faults at lower levels are seen as a single fault by higher levels Edge MP’s will generate a new AIS with a different sequence number.

5. IEEE 802.1 July 11-16, 2004 — 5 Example: EthAIS coalescing PE2 12 34 12 34 C2 12 34 CE4 12 34 CE3 12 34 C1 12 34 CE1 PE1 12 34 PE3 12 34 PE4 12 34 P1 12 34 12 34 CE2 P3 12 34 P2 12 34 Fault1 Fault2 One EthAIS received LP MP Terminated Regenerated CCLoss Effectively solves the cascading problem without requiring AIS frame format change

6. IEEE 802.1 July 11-16, 2004 — 6 Problem II: EthAIS Alarm suppression inaccuracies > Link failure alarms raised at server level, so CC loss alarm at any other level must be suppressed. > However, don’t want to suppress a CC loss due to customer fabric failure, because it is the only way to detect fabric faults. > A mechanism to selectively alarm fabric failure CCLoss needed 12 34 C2 12 34 C1 12 34 CE1 PE1 12 34 PE3 12 34 PE4 12 34 P1 12 34 MP1 MP2 MP3MP5 12 34 CE3 12 34 CE4 Link Fault1 Fabric Fault2 MP4 CCLoss suppressed ME { MP5, MP1} CCLoss 1 ME { MP5, MP4} CCLoss 2 suppressed This must be alarmed ME { MP5, MP4} CCLoss 2

7. IEEE 802.1 July 11-16, 2004 — 7 CCLoss suppressed CCLoss NOT suppressed Solution: TLV in AIS frame > EthAIS indicates which upper level MPs (MP1) are affected by a CCLoss > Stored in a data base at edge MP’s (Learning phase) > New TLV in EthAIS containing MP1 > MP suppress CCLoss from MEs indicated in the EthAIS TLV (AIS TLV phase) 12 34 C2 12 34 CE4 12 34 C1 12 34 CE1 PE1 12 34 PE3 12 34 PE4 12 34 P1 12 34 MP1 MP2 MP3 MP1 MP5 CCLoss suppressed 12 34 CE3 Link Fault1 Fabric Fault2 MP4 ME { MP5, MP1} CCLoss 1 ME { MP5, MP4} CCLoss 2

8. IEEE 802.1 July 11-16, 2004 — 8 Implementation: EthAIS database > Indicates which customer MPs are behind provider MPs Provider MP Customer MPs behind it MP 2 MP 44 MP 1 --- MP 24 MP 28 --- EthAIS database in MP 3 12 34 CE1 PE1 12 34 MP3

9. IEEE 802.1 July 11-16, 2004 — 9 How is the TLV (MP1) generated for AIS? > MP1 is learnt from green CC. > MP1 is installed in blue CC to populate the EthAIS database in MP3 > Additional TLV in CC frames 12 34 C2 12 34 CE4 12 34 CE3 12 34 C1 12 34 CE1 PE1 12 34 PE3 12 34 PE4 12 34 P1 12 34 CC MP1 CC MP1 CC MP1 Port 3 LP3 EthAIS database MP2 MP1-> ----- MP3 CC MP1 LP2 CC Database MP1-> ----- MP2 CC Port 2 TLV CC MP1 MP3 MP2

10. IEEE 802.1 July 11-16, 2004 — 10 Summary +We propose: +a new Ethernet Coalescing scheme. +One AIS generated for multiple lower level faults. +a scheme for EthAIS accurate alarm suppression. +Allows for CC loss due to fabric failures to be alarmed, inspite of EthAIS. +EthAIS indicates unreachable upper level end point MP’s +We propose: +a new Ethernet Coalescing scheme. +One AIS generated for multiple lower level faults. +a scheme for EthAIS accurate alarm suppression. +Allows for CC loss due to fabric failures to be alarmed, inspite of EthAIS. +EthAIS indicates unreachable upper level end point MP’s

11. IEEE 802.1 July 11-16, 2004 — 11 www.alcatel.com