RFC 3215 (rfc3215) - Page 2 of 78

LDP State Machine

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RFC 3215                   LDP State Machine                January 2002


Table Of Contents

   1. Terminology ...................................................  4
   2. State Machine for Downstream-on-Demand Mode ...................  4
   2.1 An LSR's Behavior in the Case of a Next Hop Change ...........  4
   2.2. ATM Switch LSR with No VC-merge Capability ..................  5
   2.2.1 LSP Control Block ..........................................  5
   2.2.2 States .....................................................  7
   2.2.3 Events .....................................................  8
   2.2.4 State Transitions ..........................................  9
   2.2.5 State Machine .............................................. 10
   2.2.5.1 State -- "IDLE" .......................................... 10
   2.2.5.2 State -- "RESPONSE_AWAITED" .............................. 13
   2.2.5.3 State -- "ESTABLISHED" ................................... 16
   2.2.5.4 State -- "RELEASE_AWAITED" ............................... 21
   2.2.6 Handling the Next Hop Change ............................... 23
   2.2.6.1 Next Hop Trigger Control Block ........................... 24
   2.2.6.2 States ................................................... 24
   2.2.6.3 Events ................................................... 24
   2.2.6.4 State Transition for next hop change ..................... 25
   2.2.6.5 State Machine ............................................ 25
   2.2.6.5.1 State -- "IDLE" ........................................ 25
   2.2.6.5.2 State -- "NEW_NH_RETRY" ................................ 27
   2.2.6.5.3 State -- "NEW_NH_RESPONSE_AWAITED" ..................... 28
   2.2.7 LDP Related Message Handling ............................... 29
   2.3. ATM Switch LSR with VC-merge ................................ 31
   2.3.1 VC-merge ................................................... 31
   2.3.2 Control Block .............................................. 31
   2.3.3   State Machines for Downstream-on-demand Mode ............. 34
   2.3.3.1 State of the Upstream LSP Control Block's State Machine
           for Downstream-on-demand Mode ............................ 34
   2.3.3.2 Events of the Upstream LSP Control Block's State Machine
           for Downstream-on-demand Mode ............................ 35
   2.3.3.3 State Transitions of the Upstream LSP Control Block's State
           Machine for Downstream-on-demand Mode .................... 36
   2.3.3.4 Upstream LSP Control Block's State Machine
           for Downstream-on-demand Mode ............................ 37
   2.3.3.4.1 State -- "IDLE" ........................................ 37
   2.3.3.4.2 State -- "RESPONSE_AWAITED" ............................ 39
   2.3.3.4.3 State -- "ESTABLISHED" ................................. 42
   2.3.3.4.4 State -- "RELEASE_AWAITED" ............................. 45
   2.3.3.5 State of the Downstream LSP Control Block's State Machine
           for Downstream-on-demand Mode ............................ 47
   2.3.3.6 Events of the Downstream LSP Control Block's State Machine
           for Downstream-on-demand Mode ............................ 47
   2.3.3.7 State Transitions of the Downstream LSP Control Block's
           State Machine for Downstream-on-demand mode .............. 48




Boscher, et al.              Informational
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