Re: DECnet phase IV node drops itself. Why? How?
From: Hoff Hoffman (hoff_at_hp.nospam)
Date: 09/29/05
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Date: Thu, 29 Sep 2005 16:37:48 GMT
In article <1128004369.768012.272660@g44g2000cwa.googlegroups.com>, "AEF" <spamsink2001@yahoo.com> writes:
:Hoff Hoffman wrote:
:> In article <1127938795.354636.197410@g43g2000cwa.googlegroups.com>, "AEF" <spamsink2001@yahoo.com> writes:
..
:> What is connected onto the SVA-0 port here?
:
:Other MicroVAX 3100's, mostly model 80's, but 3 model 95's.
You're using the integrated NIC on the MicroVAX 3100, then.
(There are various pieces of hardware that use the DECnet
SVA interface.)
As for the question, I was refering to the controller hardware
and the hardware immediately hanging off the controller, as well
as any bridges, switches, hubs, repeaters or terminators that
might be in use here.
:> Is this box an end-node, a level one router, or an area router?
:
:NODE_X is a router
Is there more than one circuit connection on these hosts?
(On a MicroVAX 3100 series box, that would be comparatively
unusual -- but there are ways to achieve it.)
:These are on a VLAN in London.
So there is some comparatively unusual hardware within the network
here -- these systems are not locally connected.
:We have 2 DNIP tunnels, one from NYC to London and another from NYC to
:Hong Kong. NODE_X is one end of the NYC to London tunnel.
So there could easily be a problem within the connection between
the hosts.
Are the VLAN devices (bridges or routers, I assume) reporting any
connectivity errors?
:> Does this box have more than one network connection to the
:> same or to the same bridged network segment?
I'll repeat: does this box have more than one network connection
to the same or to the same bridged network segment? DECnet
Phase IV does not like that, and will generate errors -- usually
IVADDR invalid media address errors IIRC, but things can and do
get strange when the node can "see" itself.
:> What versions of DECnet and OpenVMS (and ECOs) are involved here?
:
:NODE_F: VMS 6.1
:NODE_X: VMS 6.2
:NODE_Y: VMS 6.1
Old, obviously. No hope of upgrades or ECOs, I assume.
::> Network cabling problems (cable shorts, too little or too much
::> termination on ThinWire or thick wire, etc) and controller (and
::> the transceiver, for those NICs that use one) hardware problems
::> can cause DECnet circuits to yo-yo.
::
::
::Well, most of the time things are fine. I was curious, however, how a
::node can drop itself?! There may be some off-hours work being done in
::our London data center (I'm located in NYC) as they are preparing for
::relocation to another site in London.
When the network connection becomes unstable due to faults within
the cabling, the VLAN (in this case), or a hardware problem, the
host can and will report errors.
Messing about within a network can most certainly trigger these
errors -- this is why I have been asking about connectivity here.
---------------------------- #include <rtfaq.h> -----------------------------
For additional, please see the OpenVMS FAQ -- www.hp.com/go/openvms/faq
--------------------------- pure personal opinion ---------------------------
Hoff (Stephen) Hoffman OpenVMS Engineering hoff[at]hp.com
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