Ethernet Type Fields and Addresses


URBANIAK@G.BBN.COM
30 May 1988 14:13-EDT


BAD MSG:
1600 VALID-machine protocol? *
208 BBN Simnet Private %
6000 DEC unassigned
6001 DEC Maintenance Operation Protocol (MOP) Dump/Load Assistance
6002 DEC Maintenance Operation Protocol (MOP) Remote Console
6003 DECNET Phase IV
6004 DEC Local Area Transport (LAT)
6005 DEC diagnostic protocol (at interface initialization?)
6006 DEC customer protocol
6007 DEC Local Area VAX Cluster (LAVC)
6008 DEC unassigned
6009 DEC unassigned
8003 Cronus VLN
8004 Cronus Direct
8005 HP Probe protocol
8006 Nestar
8010 Excelan
8035 Reverse Address Resolution Protocol (RARP)
8038 DEC LanBridge Management
8039 DEC unassigned
803A DEC unassigned
803B DEC unassigned
803C DEC unassigned
803D DEC Ethernet Encryption Protocol
803E DEC unassigned
803F DEC LAN Traffic Monitor Protocol
8040 DEC unassigned
8041 DEC unassigned
8042 DEC unassigned
805B Stanford V Kernel, experimental
805C Stanford V Kernel, production
809B EtherTalk (AppleTalk over Ethernet)
80F3 AppleTalk Address Resolution Protocol (AARP)
9000 Loopback (Configuration Test Protocol)
FF00 BBN VITAL-LanBridge cache wakeups %

* These protocols use Ethernet broadcast, where multicast would be preferable.
# BBN Butterfly Gateways also use 0800 for non-IP, with IP version field = 3.
% BBN Private Protocols, not registered
Ethernet Vendor Addresses 4/29/88

Ethernet hardware addresses are 48 bits, expressed as 12 hexadecimal digits
(0-9, plus A-F, capitalized). These 12 hex digits consist of
the first/left 6 digits (which should match the vendor of the Ethernet interface
within the station) and the last/right 6 digits which specify the interface
serial number for that interface vendor.

Currently we have noted the following vendor addresses, on the
BBN Corporate Ethernet.

000093 Proteon
0000AA Xerox Xerox machines
000102 BBN BBN internal usage (not registered)
00DD00 Ungermann-Bass
020701 Interlan UNIBUS or QBUS machines
020406 BBN BBN internal usage (not registered)
02608C 3Com IBM PC; Imagen; Valid
02CF1F CMC Masscomp
080002 Bridge
080005 Symbolics Symbolics LISP machines
080009 Hewlett-Packard
080010 AT+T
080014 Excelan BBN Butterfly, Masscomp
08001A Data General
08001E Apollo
080020 Sun Sun machines
080028 TI Explorer
08002B DEC UNIBUS or QBUS machines, VAXen, LANBridges
                        (DEUNA, DEQNA, DELUA)
080047 Sequent
08004C Encore
080068 Ridge
080089 Kinetics AppleTalk-Ethernet interface
08008B Pyramid
08008D XyVision XyVision machines
AA0003 DEC Physical address for some DEC machines
AA0004 DEC Logical address for systems running DECNET

Ethernet addresses might be written unhyphenated (e.g. 123456789ABC),
or with one hyphen (e.g. 123456-789ABC), but should be written hyphenated
by octets (e.g. 12-34-56-78-9A-BC).

These addresses are physical station addresses, not multicast nor
broadcast, so the second hex digit (reading from the left)
will be even, not odd.

At present, it is not clear how the IEEE assigns Ethernet block addresses.
Whether in blocks of 2**24 or 2**25, and whether multicasts are assigned
with that block or separately. A portion of the vendor block address
is reportedly assigned serially, with the other portion intentionally
assigned randomly. If there is a global algorithm for which addresses
are designated to be physical (in a chipset) versus logical
(assigned in software), I am unaware of the algorithm.
Current Ethernet Multicast Addresses 5/5/88

Ethernet Type
Address Field Usage

Multicast Addresses:



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