Dr.%20Abhay%20Karandikar

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Protection Switching for Point to Multipoint TESI

• Dr. Abhay Karandikar
• A Jishnu, M Vinod Kumar

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Introduction

• Qay has P2P 11 protection mechanism
• P2MP protection mechanism is pending
• This presentation describes protection switching
  requirements for P2MP

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PBB-TE Network Topology
BEB1
BEB2
BCB1
BCB2
Link
BCB3
BEB3
4
P2MP work TESI
BEB1
BEB2
BCB1
BCB2
Link
BCB3
BEB3
Work
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Concept

• PBB-TE MA enhanced with MD levels
• Switchover is performed first in the lowest MD
  level
• If switchover fails within an MD level then
  switchover is performed in the next higher MD
  level
• Switchover is locked-out in higher MD level using
  LockOutProtection (LoP)

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P2MP Protection Segment 1
BEB1
BEB2
BCB1
BCB2
Link
BCB3
BEB3
Work
Protect
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P2MP Protection Segment 2
BEB1
BEB2
BCB1
BCB2
Link
BCB3
BEB3
Work
Protect
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P2MP Protection Segment 3
BEB1
BEB2
BCB1
BCB2
Link
BCB3
BEB3
Work
Protect
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P2MP TESI Protection
BEB1
BEB2
BCB1
BCB2
Link
BCB3
BEB3
Work
Protect
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HPD for Segment 1
Protected Domain 1 gt MD Level 1
Protected Domain 0 gt MD Level 0
BEB1
BEB2
BCB1
BCB2
Link
BCB3
BEB3
11
HPD for Segment 2
Protected Domain 1 gt MD Level 1
Protected Domain 0 gt MD Level 0
BEB1
BEB2
BCB1
BCB2
Link
BCB3
BEB3
12
HPD for Segment 3
Protected Domain 1 gt MD Level 1
Protected Domain 0 gt MD Level 0
BEB1
BEB2
BCB1
BCB2
Link
BCB3
BEB3
13
HPD implementation
Protected Domain 1 gt MD Level 1
Protected Domain 0 gt MD Level 0
BEB1
BEB2
BCB1
BCB2
w
w
p
p
p
p
Link
BCB3
BEB3
Work
Protect
-MEP
CCM
-MIP
14
Fault in MDL 0
Protected Domain 1 gt MD Level 1
Protected Domain 0 gt MD Level 0
LoP1
BEB1
BEB2
BCB1
BCB2
w
w
LoP1
p
p
LoP1
p
p
Link
BCB3
BEB3
Work
Protect
-MEP
CCM
-MIP
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Switchover in MDL 0
Protected Domain 1 gt MD Level 1
Protected Domain 0 gt MD Level 0
BEB1
BEB2
BCB1
BCB2
w
w
p
p
p
p
Link
BCB3
BEB3
Work
Protect
-MEP
CCM
-MIP
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Benefits

• Simple to understand, to implement and to
  provision
• Other TESIs will be less affected by the
  switchover
• Has less stringent requirement on the network
  resources
• Some path segments need not be protected
• Node protection can be handled
• Node failure is similar to atleast two link
  failure
• Leads to unified framework for link protection
  within a single PBB-TE domain
• Leads to unified framework for protection across
  multiple PBB-TE domains