[Simh] LAVC

[Tim Stark]

Yeah.

I believe so.  That is possible to replace CI/DSSI physical layer with UDP over IP multicast to embed SCS/MSCP packets to other hosts and HSCs at once.

That's why Charon-VAX already emulates virtual CI and HSJ for VAX 66x0 emulation. I read Charon documents and learned that emulated CI uses SCS/MSCP over IP method.

That is same way like BITNET over TCP/IP and DECnet over TCP/IP (HECnet provides bridge adapter software).

That’s why I studied Computer Networking and learned lot about ISO layers at university.
Also about bridging and routing methods.


Tim

-----Original Message-----
From: Mark Pizzolato [mailto:Mark at infocomm.com] 
Sent: Saturday, March 11, 2017 11:19 AM
To: Tim Stark <fsword7 at verizon.net>; simh at trailing-edge.com
Subject: RE: [Simh] LAVC

On Saturday, March 11, 2017 at 5:49 AM, Tim Stark wrote:
> Thanks for many replies. I learned a lot about VAX clustering. I will 
> use multicast Ethernet for clustering.  I have more one question. Is 
> that possible to emulate HSC controllers with LAVC access?

When Matt Burke and I were discussing the CI concept, we picked IP Multicast as transport for the very specific reason that all modern host systems will have natural user mode programming access to implement this functionality.  Attempting to create your own Ethernet multicast protocol (non-IP based) will have portability complexities on different platforms due to the fact different platforms have varying support (and potentially require privilege) to present and/or receive raw Ethernet frames to/from a LAN.

- Mark