StrategyChoice » History » Version 6
Junxiao Shi, 09/08/2014 05:19 PM
| 1 | 4 | Junxiao Shi | # Strategy Choice Management |
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| 2 | 1 | Junxiao Shi | |
| 3 | 4 | Junxiao Shi | **Strategy Choice Management** is a module of [[Management|NFD Management protocol]]. |
| 4 | It provides: |
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| 5 | 1 | Junxiao Shi | |
| 6 | 4 | Junxiao Shi | * commands to choose the forwarding strategy for a namespace |
| 7 | 5 | Junxiao Shi | * a dataset of strategy choices |
| 8 | 1 | Junxiao Shi | |
| 9 | 5 | Junxiao Shi | Strategy Choice Management commands and datasets are published in namespace `ndn:/localhost/nfd/strategy-choice`. |
| 10 | 1 | Junxiao Shi | |
| 11 | |||
| 12 | 4 | Junxiao Shi | ## Strategy |
| 13 | 1 | Junxiao Shi | |
| 14 | 6 | Junxiao Shi | A strategy is identified by a Name. |
| 15 | 1 | Junxiao Shi | |
| 16 | 4 | Junxiao Shi | NFD currently supports builtin strategies only. The following strategies are available: |
| 17 | 1 | Junxiao Shi | |
| 18 | 4 | Junxiao Shi | * ndn:/localhost/nfd/strategy/best-route |
| 19 | * ndn:/localhost/nfd/strategy/broadcast |
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| 20 | * ndn:/localhost/nfd/strategy/client-control |
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| 21 | 1 | Junxiao Shi | * ndn:/localhost/nfd/strategy/ncc |
| 22 | 4 | Junxiao Shi | |
| 23 | 6 | Junxiao Shi | Each strategy listed above may have one or more versions. Strategy version is increased when there is a major behavior change; bugfixes usually won't bump strategy version. The version number is appended to strategy Name. |
| 24 | 1 | Junxiao Shi | |
| 25 | 6 | Junxiao Shi | |
| 26 | 4 | Junxiao Shi | ## Control Commands |
| 27 | 1 | Junxiao Shi | |
| 28 | 4 | Junxiao Shi | [[ControlCommand]] **management-module**: `strategy-choice` |
| 29 | 3 | Junxiao Shi | |
| 30 | 4 | Junxiao Shi | ### Set the strategy for a namespace |
| 31 | 1 | Junxiao Shi | |
| 32 | 4 | Junxiao Shi | **command-verb**: `set` |
| 33 | 1 | Junxiao Shi | |
| 34 | 4 | Junxiao Shi | ControlParameters fields: |
| 35 | 1 | Junxiao Shi | |
| 36 | 4 | Junxiao Shi | * Name (required) |
| 37 | 1 | Junxiao Shi | * Strategy (required) |
| 38 | |||
| 39 | 6 | Junxiao Shi | **Name** is the Name prefix on which the strategy is selected. |
| 40 | 1 | Junxiao Shi | |
| 41 | 6 | Junxiao Shi | **Strategy** must be a Name that represents a builtin strategy. |
| 42 | It could be either an unversioned Name to select the latest version of a strategy, or a versioned Name to select a specific version. It's recommended to use an unversioned Name so that the latest strategy version is picked. |
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| 43 | If **Strategy** does not match any builtin strategy, the command fails with code 504. |
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| 44 | |||
| 45 | If the command succeeds, \<Body> in ControlResponse block contains updated ControlParameters: |
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| 46 | |||
| 47 | * Name: unchanged |
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| 48 | * Strategy: versioned strategy Name |
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| 49 | |||
| 50 | 1 | Junxiao Shi | ### Unset the strategy for a namespace |
| 51 | 4 | Junxiao Shi | |
| 52 | 1 | Junxiao Shi | **command-verb**: `unset` |
| 53 | |||
| 54 | ControlParameters fields: |
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| 55 | |||
| 56 | 4 | Junxiao Shi | * Name (required) |
| 57 | 1 | Junxiao Shi | |
| 58 | 6 | Junxiao Shi | After this operation, the effective strategy at **Name** is inherited from the parent. |
| 59 | If there is no strategy defined at **Name**, this command does nothing, but is still considered successful. |
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| 60 | 1 | Junxiao Shi | |
| 61 | 6 | Junxiao Shi | **Name** must not be `ndn:/`, otherwise the command fails with code 403. |
| 62 | 5 | Junxiao Shi | |
| 63 | |||
| 64 | ## Strategy Choice Dataset |
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| 65 | |||
| 66 | Strategy choices for namespaces are published as a [[StatusDataset|Status Dataset]] at `ndn:/localhost/nfd/strategy-choice/list`. |
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| 67 | |||
| 68 | Each face is represented by a **StrategyChoice** block: |
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| 69 | 1 | Junxiao Shi | |
| 70 | 5 | Junxiao Shi | StrategyChoice := STRATEGY-CHOICE-TYPE TLV-LENGTH |
| 71 | Name |
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| 72 | Strategy |
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| 73 | |||
| 74 | * **Name** is the namespace on which a strategy is chosen. |
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| 75 | * **Strategy** is the strategy chosen for this namespace. |
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| 76 | 6 | Junxiao Shi | |
| 77 | 5 | Junxiao Shi | |
| 78 | ## TLV-TYPE assignments |
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| 79 | |||
| 80 | Type | Assigned value | Assigned value (hex) |
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| 81 | ------------------------------------------- | ----------------- | -------------------- |
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| 82 | StrategyChoice | 128 | 0x80 |