RFC 9097 §7: IP-Layer Sender Bit Rate Singleton Metric Definitions
The 10 Requirements of RFC 9097 §7, each quoted from the RFC with its state and the tests that prove it. Conformance explains the states.
| State | Requirements |
|---|---|
| Tested | 7 |
| Deviation | 1 |
| Not applicable | 2 |
RFC9097-7.2-1
Not applicable
This section lists the REQUIRED input factors to specify the metric, beyond those listed in Section 4.
Note: An introduction to the section’s Requirements, each recorded with its own ID; nothing to do beyond them.
RFC9097-7.2-L1
Tested
The nominal duration of N sub-intervals in S (default st = 0.05 seconds).
Note: st, one Trial Interval.
Proving tests:
RFC9097-7.2-2
Tested
S SHALL be longer than I, primarily to account for on-demand activation of the path, or any preamble to testing required, and the delay of the path.
Proving tests:
RFC9097-7.2-3
Tested
st SHOULD be much smaller than the sub-interval dt and on the same order as FT; otherwise, the rate measurement will include many rate adjustments and include more time smoothing, possibly smoothing the interval that contains the Maximum IP-Layer Capacity (and therefore losing relevance).
Proving tests:
RFC9097-7.3-1
Not applicable
This section defines the REQUIRED aspects of the IP-Layer Sender Bit Rate Metric (unless otherwise indicated) for measurements at the specified Source on packets addressed for the intended Destination host and matching the required Type-P:
Note: An introduction to the section’s Requirements, each recorded with its own ID; nothing to do beyond them.
RFC9097-7.3-2
Tested
Define the IP-Layer Sender Bit Rate, B(S,st), to be the number of IP- Layer bits (including header and data fields) that are transmitted from the Source with address pair Src and Dst during one contiguous sub-interval, st, during the test interval S (where S SHALL be longer than I) and where the fixed-size packet count during that single sub- interval st also provides the number of IP-Layer bits in any interval, [stn,stn+1].
Note: IP-Layer Sender Bit Rate.
Proving tests:
RFC9097-7.3-3
Tested
Measurements according to this definition SHALL use the UDP transport layer.
Proving tests:
RFC9097-7.3-4
Deviation
Any feedback from the Dst host to the Src host received by the Src host during an interval [stn,stn+1] SHOULD NOT result in an adaptation of the Src host traffic conditioning during this interval (rate adjustment occurs on st interval boundaries).
Recorded in rate-changes-when-a-status-pdu-arrives.
RFC9097-7.4-1
Tested
Both the Sender and Receiver (or Source and Destination) bit rates SHOULD be assessed as part of an IP-Layer Capacity measurement.
Proving tests:
crates/udpstp/src/results.rs::an_upstream_testcrates/udpstp/tests/loopback.rs::fixed_rate_tests_complete_over_loopbackcrates/udpstp-core/src/data_phase.rs::sender_estimate_keeps_ordinary_gaps_duplicates_and_out_of_order_loadcrates/udpstp-core/tests/sender_estimate.rs::the_estimate_follows_what_the_server_sent_despite_losscrates/udpstp-core/tests/sub_interval_results.rs::an_upstream_client_reports_what_it_sent_per_st
RFC9097-7.5-1
Tested
The IP-Layer Sender Bit Rate SHALL be reported with meaningful resolution, in units of Megabits per second (which, to avoid any confusion, is 1,000,000 bits per second).
Proving tests: