Coordination Between Segment Protection and Global Protection M
Co-ordination Between Segment Protection and Global Protection M Vinod Kumar Abhay Karandikar Version 1. 0
Infrastructure Segment Protection Case 1 ISP Not Required; ISP Required Only Global Protection (GP) Needed Case 2 Case 3 ISP without GP ISP with GP Case 3 a First ISP and then GP Case 3 a FT Fixed Timer GP Timer > ISP Timer 9/17/2020 Case 3 b Certain TESI is outside the scope of ISP; Only GP for them Case 3 a C or FBT Coordination or Feedback Based Timer Efficient and Reliable Tejas Networks Ltd Alan Mc. Guire’s (BT) Requirement Need a mechanism to identify it e. g. MST-ID 2
Case 1 • Infrastructure Segment Protection not required; only Global Protection Work TESI BEB 1 SEB 2 BEB 2 Protect TESI N 1 Bridge N 2 9/17/2020 Tejas Networks Ltd Link 3
Case 2 • Only Infrastructure Segment Protection required but NO Global Protection Work ISP CCM BEB 1 SEB 1 Work TESI CCM SEB 2 BEB 2 N 1 Protect ISP CCM N 2 9/17/2020 Tejas Networks Ltd Bridge Link 4
Case 3 • Infrastructure Segment Protection with Global Protection Work ISP CCM BEB 1 SEB 2 N 1 Pre-Provisioning of Work TESI/ CCM 9/17/2020 Work TESI CCM Protect ISP CCM N 2 Tejas Networks Ltd BEB 2 Protect TESI CCM Bridge Link 5
Observation • Among the 3 -cases depicted only case-3 needs extra care – We consider first Case 3 b and then Case 3 a 9/17/2020 Tejas Networks Ltd 6
Case 3 b • TESI is outside the scope of Infrastructure Segment Protection • Could use different MST-ID Work ISP CCM BEB 1 SEB 2 N 1 Pre-Provisioning of Work TESI/ CCM 9/17/2020 Work TESI CCM Protect ISP CCM N 2 Tejas Networks Ltd BEB 2 Protect TESI CCM Bridge Link 7
Case 3 a Fixed Timer • Infrastructure Segment Protection with Global Protection – If link SEB 1 -SEB 2 fails, Segment Protection should be done before Global Protection • • • T 2 > T 1 BEB 1 So Hold. Off. Timer T 2>T 1, How do we set this? How large should be T 2? This will slow the Global Protection. Not reliable. So Case 3 a Coordination or Feedback Based Timer is ideal T 1 Work ISP CCM SEB 1 SEB 2 N 1 Pre-Provisioning of Work TESI/ CCM 9/17/2020 Work TESI CCM Protect ISP CCM N 2 Tejas Networks Ltd BEB 2 Protect TESI CCM Bridge Link 8
Case 3 a Coordination or Feedback • Infrastructure Segment Protection with Global Protection – If link SEB 1 -SEB 2 fails, then SEB 1 and SEB 2 will coordinate with BEB 1 and BEB 2 informing that ISP will handle the fault Feedback BEB 1 SEB 1 Pre-Provisioning of Work TESI/ CCM Work TESI CCM SEB 2 N 1 9/17/2020 Feedback Work ISP CCM Protect ISP CCM N 2 Tejas Networks Ltd BEB 2 Protect TESI CCM Bridge Link 9
Conclusion • Coordination is a mandatory requirement in Case 3 a • Will increase reliability and speed. 9/17/2020 Tejas Networks Ltd 10
Thanks 9/17/2020 Tejas Networks Ltd 11
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