1. 1 DRNI  Network Protection Interaction Some examples in which one or more faults in DRNI require a change in Network Protection Some examples in which one or more faults in Network Protection require a change in DRNI Adds additional ‘external’ protection switching trigger condition(s) to DRNI (from NP) and to NP (from DRNI) DRNI and NP need to communicate with each other; what is the minimum message set?

2. 2 2 3 1 4 5 6 Active GW Standby GW Figure 1A Figure 1B 2 3 1 4 5 6 Active GW Standby GW W P W P W P W P Network Protection DRNI Network Protection DRNI Two Network Protection (NP) architecture cases TOP: with Intra-NP link BOTTOM: without intra-NP link

3. 3 3 2 1 4 5 6 X Active GW Standby GW Figure 2A Figure 2B 2 3 1 4 5 6 X Active GW Standby GW W P W P W P W P Network Protection DRNI Network Protection DRNI DRNI configuration change to restore EC (no interaction with network protection)

4. 4 2 3 1 4 5 6 X X Active GW Standby GW 2 3 1 4 5 6 X X Active GW Standby GW Figure 3A Figure 3B W P W P W P W P Network Protection DRNI Network Protection DRNI DRNI configuration change plus DRNI initiated Network Protection configuration change to restore EC NP change restricted to portal nodes NP change involves node outside portal

5. 5 2 3 1 4 5 6 Active GW Standby GW Figure 4A Figure 4B 2 3 1 4 5 6 Active GW Standby GW W P W P W P W P Network Protection DRNI Network Protection DRNI Network Protection configuration change to restore EC (no interaction with DRNI) X X Network Protection configuration change and NP initiated DRNI configuration change to restore EC

6. 6 2 3 1 4 5 6 Active GW Standby GW Figure 5A W P W P Network Protection DRNI X X Network Protection configuration change and NP initiated DRNI configuration change to restore EC

7. 7 Network Protection Types 802.1Q B-VLAN recovery via MSTP/MVRP 802.1Q TESI protection G.8031 EC SNCP G.8032 Ethernet Ring Protection G.873.1 ODUk SNCP and more….

8. 8 B-VLAN Recovery How to control that active B-VLAN endpoint is moved from node 2 to node 3 for examples in figures 3A, 3B, 4B and 5A? How to control that DRNI active GW is moved from node 2 to node 3 for examples in figures 4B and 5A?

9. 9 TESI Protection How to control that active TESI endpoint is moved from node 2 to node 3 for examples in figures 3A, 3B, 4B and 5A? How to control that DRNI active GW is moved from node 2 to node 3 for examples in figures 4B and 5A? How to control that TESI endpoint in node 1 switches from W to P for example in figure 3B?

10. 10 EC SNC Protection How to control that active EC SNCP endpoints are moved from node 2 to node 3 for examples in figures 3A, 3B, 4B and 5A? How to control that DRNI active GW is moved from node 2 to node 3 for examples in figures 4B and 5A? How to control that EC SNCP endpoint in node 1 switches from W to P for example in figure 3B?