[HECnet] VAX/VMS 1.50

[Paul_Koning at Dell.com]

On Apr 8, 2013, at 5:42 PM, Johnny Billquist wrote:

On 2013-04-08 23:26, Paul_Koning at Dell.com wrote:

On Apr 8, 2013, at 5:09 PM, Johnny Billquist wrote:

...
By the way, MOP, from an ethernet point of view, is neither LAT nor DECnet. MOP is its own protocols on ethernet. 0x6001 and 0x6002. But I believe they were defined as being a part of the DECnet suite anyway.

The MOP spec is one of the DECnet architecture specs.   And in fact it relies on the DNA datalink layer and is controlled via the DNA management layer.   Other than that, it's indeed separate -- doesn't use routing or NSP.

Paul, what do you mean by "relies on the DNA datalink layer"?

MOP either uses DDCMP, which is a point to point DNA datalink layer, or Ethernet (including the DEC-originated explicit packet length field) which is a multicast DNA datalink layer.   Or FDDI, I suppose, which is another DNA datalink layer.

In the latter two cases it may not be all that obvious, because people tend to think of Ethernet and FDDI as international standards.   And so they are -- but DNA adds more detail.   The packet length field in DNA Ethernet protocols (MOP and routing) is something in the DNA Ethernet spec but not in the international standard.

	paul