1779   MAC address IC hash algorithm should apply to reciever side

Created: 30 Jun 2021

Status: Editorial

Part: Part 8-1 (2020; Edition 2.1)

Links:

Page: 161

Clause: Annex B

Paragraph: 2

Issue

"Vendors of IEC 61850-8-1 implementations that send these types of messages should provide recommendations of addressing based upon the MAC IC’s hash algorithms."
MAC filtration is happening on receive side so that's confusing why sender should provide recommendation.

Proposal

"Vendors of IEC 61850-8-1 implementations that receive these types of messages should provide 3518 recommendations of addressing based upon the MAC IC’s hash algorithms."

Discussion Created Status
Approve 11 Oct 22 Editorial
With no objection to Thierry's proposal, moving to Editorial

Change text to:

Vendors of IEC 61850-8-1 implementations that receive these types of messages should provide recommendations of addressing based upon the MAC filter.

25 Feb 22 Approval (Editoral)
I support the proposed change in the wording.
But I believe this has no practical relevance.
Other than initially perceived, these hashing/comparing methods vary widely between the interface chips.
The very simple ones may hold only 16 hashes in their lookup-tables, so there are quite some ambiguities when mapping 2^48 MAC addresses into 2^4 hashes. And even these simple ones do not all work exactly the same. "Server grade" interface controllers have many more options.
I doubt that there is a tool available that takes all of this into account to produce a MAC address scheme that works with different devices (interface chips) in a system.
02 Jul 21 Triage
Technically correct, editorial correction is good.

3518 is a lot of recommendations!

The sentence should probably be removed, or replaced with something like:

device vendors should indicate any significant limitation of the MAC filter, particularly any that affect the recommended ranges.

Note that Annex B is informative.
30 Jun 21 Triage

 

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