NFD

# Measurement Status

Measurement Status is a module of [[Management|NFD Management protocol]].

It provides measurement table entries for a given name prefix.

The strategy responsible for the name prefix need to support measurement queries.

Measurements for a prefix is published as a [[StatusDataset|Status Dataset]] at: ndn:/localhost/nfd/measurements/query/

## Control Parameters

ControlParameters fields:

    Name (required)

Name is the prefix for which the measurement query is made.

A forwarder MAY impose a limit on the length of name prefix. The current limit in NFD is 32 name components.

If Name exceeds this limit, the command fails with code 414.

## Measurement Entry Dataset

Each measurement entry is represented by **MeasurementEntry** block:

    MeasurementEntry := MEASUREMENT-ENTRY-TYPE TLV-LENGTH

                          Name

                          StrategyInfo

* **Name** is the prefix for which the query was made

* **StrategyInfo** is the measurement info provided by the strategy responsible for the given name

Strategy returns a boost::property_tree when queried and managements formats that as JSON string for StrategyInfo.

## TLV-TYPE assignments

Type                                        | Assigned number   | Assigned number (hex)

------------------------------------------- | ----------------- | ---------------------

MeasurementEntry                            | 128               | 0x80

StrategyInfo                                | 129               | 0x81