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Folks, For those on the Nendica "Header Compression" Workshop call this morning.
Having done some more homework (802-2024, 802.1AC-2016, 802.3-2022), I acknowledge that 802/802.1/802.3, including the IEE and EISS definitions, do not require changes to “support”
the UEC UFH header. For those who are interested in a longer read, here’s my assessment: Apart from the U/L and I/G bits (and maybe the Y and Z bits) we can consider destination_address & source_address as opaque octet strings. 802.3 doesn’t care
what’s in the SA/DA pair when it’s operating in promiscuous receive mode. The MAC Service (802.1AC-2016 clause 14) used for a host is a subset of the ISS (802.1AC-2016 clause 11). The Ethernet convergence function (802.1AC-2016 clause 13.1) passes the destination_address
and source_address parameters unaltered. 802 “8.4 Local MAC addresses” states:
·
Except for U/L and I/G all bits of the address are locally administered.
·
The locally administered bits of local MAC addresses are
arbitrarily assignable under the condition that local MAC addresses are unique within a LAN 802 “8.4.3 Structured Local Address Plan (SLAP)” provides a little more structure for address management for a little more control by assigning the least
significant 4 bits of the initial octet on an address as SAI bits(M,X,Y,Z) which are used to assign 4 SLAP quadrants (Extended Local, Standard Assigned, Administratively Assigned, Reserved). This also allows other 802 standards to assign additional SLAP bits.
The non-reserved quadrants are
·
Extended Local includes a 24 bit Company ID (CID aka OID), so I don’t think that fits the UFH scheme.
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Standard Assigned requires an 802 standard to define the address format
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Administratively Assigned allows for arbitrary assignment having consumed 4 bits of the address SLAP allows for multiple different local address allocation schemes operating on the same LAN. UEC_liaison_2026-04-UFH_Presentation_to_IEEE.pdf
depicts using SLAP Administratively Assigned addresses with the extra two bits (Y,Z) set to 00. Unless it’s a goal to run multiple local address assignment schemes on the target networks, the UFH could not use SLAP and reclaim an extra two bits. Regards, Peter _______________________________________________________________ Peter Jones Distinguished Engineer,
Cisco Networking Hardware Chair, Ethernet Alliance
Chair, IEEE 802.3 YANG Ad Hoc Mobile: +1 408 315 8024 Email:
petejone@xxxxxxxxx Web:
https://about.me/petergjones
Webex:
https://cisco.webex.com/meet/petejone Book a call: Book
time with Peter _______________________________________________________________ To unsubscribe from the STDS-802-3-NGECDC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-3-NGECDC&A=1 |