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panrg / path-properties

A Vocabulary of Path Properties
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Add point about the usefulness of dynamic path properties #72

Closed renghardt closed 2 years ago

renghardt commented 2 years ago

Via @SpencerDawkins in Last Call:

I’m not sure where to put it, but some of the dynamic path properties can be so dynamic that they aren’t useful in path-aware networking. For example, link usage for bursty traffic may vary so dramatically that this property can’t be used to select between paths without applying dampening or otherwise avoiding oscillation. This is somewhat related to https://www.rfc-editor.org/rfc/rfc9049.html#name-reacting-to-distant-signals, and has been mentioned about every two years for the entire time ALTO has been chartered. 🙂

Perhaps following this paragraph?

Some path properties express the performance of the transmission of a packet or flow over a link or subpath. Such transmission performance properties can be measured or approximated, e.g., by endpoints or by path elements on the path, or they may be available as cost metrics, see [I-D.ietf-alto-performance-metrics]. Transmission performance properties may be made available in an aggregated form, such as averages or minimums. Properties related to a path element which constitutes a single layer 2 domain are abstracted from the used physical and link layer technology, similar to [RFC8175].

cyrill-k commented 2 years ago

I agree with you that a clear classification of properties is difficult. Maybe we can add some text to discuss that some properties are more dynamic or more distant than others?

renghardt commented 2 years ago

Yes. I can take a first stab at this text.