[HECnet] DECnet et al

[Johnny Billquist]

On 2011-07-16 19.18, hvlems at zonnet.nl wrote:
I'm not sure what the router rules are. There are 63 areas, each with
one actove area router. There may be more routers configured as an area
router in one area; the one with the highest (?) DECnet address is
selected as the active one.

As far as I know, there can be more than one active area router. Just look at what the next hop are for different nodes in your node list... :-)

There are limits on the number of routers. There are counters in NCP,
executer max circuits and exec maximum routers.

Yes. But that is a limit on broadcast routers, and relates to adjacent routers that you want to keep track of.

On first generation VAX systems routing overhead was deemed too high.

I think it's wrong to say it was deemed "too high", as that is very subjective. But running as an endnode takes much less resources, so unless you want to run as a router, it would perhaps be benificial.

IMO this may be the case with 11/750's and slower but a MicroVAX II
could easily keep up with the traffic on a LAN with more than 1100
decnet hosts in 8 areas.

Well, a PDP-11 can keep up with it as well. (Although I have not tried anything slower than a PDP-11/70.) But it do take some CPU power, as well as memory.

	Johnny

Hans

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*From: * "Steve Davidson" <jeep at scshome.net>
*Sender: * owner-hecnet at Update.UU.SE
*Date: *Sat, 16 Jul 2011 11:23:46 -0400
*To: *<hecnet at Update.UU.SE>
*ReplyTo: * hecnet at Update.UU.SE
*Subject: *[HECnet] DECnet et al


Mark,

When I install DECnet on VMS I always use the DNVETRTG license. This way
I do not have to care about the system's role - I may change it at will

On another note, the node SGC:: is an emulated system that is always
running as an area router. This way I always have a gateway to the rest
of HECnet and the cost to run the system is minimal. DECnet has limits
as to the total number of area routers so just adding a router may not
be the best answer. The HECnet backbone is not at that limit yet... If
you were to use an emulated system as a router then it would not matter
which of the other systems you brought up - they would all be able to
see the rest of HECnet.

I should mention though that a cluster with a cluster alias MUST be a
router. It can be a level-1 or level-2 (area) though...

-Steve