Re: DECnet phase IV node drops itself. Why? How?

From: AEF (spamsink2001_at_yahoo.com)
Date: 09/30/05 

Date: 29 Sep 2005 16:54:52 -0700

H Vlems wrote:
> "AEF" <spamsink2001@yahoo.com> schreef in bericht
> news:1128004522.682818.200010@g43g2000cwa.googlegroups.com...
> >
> > H Vlems wrote:
> > > This kind of up/down pattern is what you got when heartbeat was not
> > > enabled on a transceiver when it was needed (or vice versa). SVA-0
> > > indicates a microVAX or VAXstation 3100 kind of system. It wasn't
> > > fitted with an external transceiver, was it? These older systems have
> >
> > Yes. All my MicroVAX systems have external transceivers.
> >
> > > AUI and thinwire, no support for UTP; an external transceiver solves
> > > that problem but the heartbeat switch (or SEQ or squelch) may be in the
> > > wrong position.
> > >
> > > Two other possibilities:
> > > - the system is on an ethernet segment with a *lot* of traffic (LAVc
> > > clusters, lots of ethertalk or netbeui clients)
> >
> > It was off hours, so probably not.
> >
> > > - the system was accidentally converted from an endnode to a router and
> > > does not have the appropriate DECnet license.
> >
> > Licenses are okay. This is the first time I've ever seen a node that
> > dropped itself! How can a node drop itself?
>
> Well, the most common is a license mismatch, like it or not.
> Why don't you post the output of this command, executed on the node that
> drops
> itself and one of the others that are fine:
>
> $ MC NCP SHO EXEC CHAR

All are working "fine" 99% of the time. We are now entering a period
where problems are cropping up, so I don't see what licenses have to do
with it. I tried the above command on a few nodes and it always comes
out the same except some say non-routing and some say routing. I'll
post a few tomorrow.

>
> You did mention that your systems have external transceivers. I assume that
> you've checked the
> heartbeat switch and found it in the correct position.

What heartbeat switch?

> Second assumption: these UTP transceivers run in one mode only: 10 Mb/s half
> duplex.
> What kind of network device do they connect to and is that network device
> configured for
> 10 Mb/s hd operation?

They connect to a Cisco Switch. 10Mb/s? I'll have to check tomorrow.

If it is set to autonegotiate then you might want to
> override that.
>

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