That's fine, and feasible, and in fact highly recommended if you want to build a robust network.
The one thing to keep in mind is that you need to make sure the area is not partitioned. In other words, if you build for fault tolerance, first concentrate on protecting the area from partitioning. Having done that, build redundancy into the level 2 network.
If you have two L2 routers out of the area, and that area is partitioned, traffic inbound will land on whichever area router is on the shortest path from the source. Area routing (L2 routing) is not aware of the details of what's inside areas; it only pays attention to the area part of the address. So there's a 50/50 chance that the router where the packet arrives into the destination area is the one that can't reach the destination.
BTW, this is a direct analogy with the IP requirement that you have to protect against partitioned subnets, and for the same reason.
I'm not sure from your description, but if what you're trying to do is to have two clumps of nodes that both call themselves area 6, but they aren't connected by L1 routers, the answer is that doesn't work anymore than two clumps of IP hosts that aren't connected but still claim to be in the same subnet will work. Don't do that.
paul
On Jul 23, 2012, at 7:33 PM, Mark Benson wrote:
Is it feasible/advisable/possible to have 2 Area Routers on a DECnet Phase IV network?
The only reason I ask is that I'd like my emulated cluster system to be able to run Area 6 independently as all the nodes are area 6 nodes and it'd be neat to have area 6 working at places events like DEC Legacy.
Would it cause issues on HECNet having 2 Area 6 routers in different places also? I'm guessing not as they are still on the same DECnet network, same as if they are in the same room on the same LAN, but what do I know ;)
--
Mark Benson
http://DECtec.info
Twitter: @DECtecInfo
HECnet: STAR69::MARK
Online Resource & Mailing List for DEC Enthusiasts.
Is it feasible/advisable/possible to have 2 Area Routers on a DECnet
Phase IV network?
Yes.
Restriction, you need are-routers to talk to all area-routers in your
area thorug area-routers..
So you can not have non-area routers as transit between area routers.
If you have two area routers on the same LAN, router priority and/or
node-number will be used by the non-area routers to select wich one
they hand their outgoing traffic to.
The only reason I ask is that I'd like my emulated cluster system to be =
able to run Area 6 independently as all the nodes are area 6 nodes and =
it'd be neat to have area 6 working at places events like DEC Legacy.
Would it cause issues on HECNet having 2 Area 6 routers in different =
places also? I'm guessing not as they are still on the same DECnet =
network, same as if they are in the same room on the same LAN, but what =
do I know ;)
I have 4 area routers in area 59, US-east-coast, US-west-coast and two
in Sweden, works fine.
--P
Is it feasible/advisable/possible to have 2 Area Routers on a DECnet Phase IV network?
The only reason I ask is that I'd like my emulated cluster system to be able to run Area 6 independently as all the nodes are area 6 nodes and it'd be neat to have area 6 working at places events like DEC Legacy.
Would it cause issues on HECNet having 2 Area 6 routers in different places also? I'm guessing not as they are still on the same DECnet network, same as if they are in the same room on the same LAN, but what do I know ;)
--
Mark Benson
http://DECtec.info
Twitter: @DECtecInfo
HECnet: STAR69::MARK
Online Resource & Mailing List for DEC Enthusiasts.
FYI - I m updating Multinet and making a few other changes on LEGATO this morning. It shouldn t require any changes on anybody else s end, but you will see the machine being rebooted several times this morning.
Bob
On 2012-07-16 02:42, Dan Williams wrote:
Hi,
I don't know who is updating the records at the moment. But I now have
machines up and running, they should be up 24x7
51.1 slimer zx6000 VMS V8.3-1H1
51.2 Walter zx6000 VMS V8.3-1H1
51.3 dana simh VMS V7.3
51.4 gozer IBM 911-285 Debian Squeeze
51.5 ray 4000/90 VMS V7.3
By the way, I assume this means all previous definitions in area 51 are invalid, and were deleted. Let me know if I was wrong. The old ones you had conflicted with this list.
Johnny
On 2012-07-16 02:42, Dan Williams wrote:
Hi,
I don't know who is updating the records at the moment. But I now have
machines up and running, they should be up 24x7
That would be me.
51.1 slimer zx6000 VMS V8.3-1H1
51.2 Walter zx6000 VMS V8.3-1H1
51.3 dana simh VMS V7.3
51.4 gozer IBM 911-285 Debian Squeeze
51.5 ray 4000/90 VMS V7.3
Noted.
I was looking through the archives, I thought I saw that someone had
layered products for ia64 on their machine. Can anyone remind me who
it was ?
I know someone did have something up, but the memory fails me too at the moment.
Johnny
On 2012-07-16 00:22, Boyanich, Alastair wrote:
Nice!
You've got further than I did on my 11 due to lack of tapes. Out of
interest, is there something similar to the VMS hobbyist distro where
you can pay or even better freely download all the compilers, layered
products, $other crimes ?
Nope. :-(
It's still owned, restricted and a silly situation. Just like the last 10 years...
Johnny
Al.
-----Original Message-----
From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] On
Behalf Of Jordi Guillaumes i Pons
Sent: Monday, 16 July 2012 1:55 AM
To: hecnet at Update.UU.SE
Subject: [HECnet] RSX11M 4.6 complete installation logs
I've completed 3 posts about the installation/generation of a RSX11M
4.6 (no
plus) system from scratch under the simh simulator. If someone is
interested,
the links are:
http://ancientbits.blogspot.com.es/2012/07/installing-rsx-11m-46-from-
scratch-part.html
http://ancientbits.blogspot.com.es/2012/07/installing-rsx-11m-46-from-
scratch-part_12.html
http://ancientbits.blogspot.com.es/2012/07/installing-rsx-11m-46-from-
scratch-part_15.html
(There is no addsense in that blog, even though I must confess I tried
to enable
it and was rebuked by google because of "lack of content" ;), so this
obvious
spamming has no monetary interests behind ;)).
I'd like to complete my setup with decnet and some layered products.
I've got
BP2 2.5, F4 2.8 and F77 5.4. I'd like to get:
- COBOL (74 and 81)
- FMS-11
- DECNET (I've got a kit for 11M+, but no for 11M)
- DBMS-11 (CODASYL databases rule! :))
- Of course, a more up-to-date version of BP2 (I've got one for
microRSX that
does not run under 11M).
I'd appreciate anyone pointing me to where I could find those jewels
:)
Jordi Guillaumes i Pons
jg at jordi.guillaumes.name
HECnet: BITXOV::JGUILLAUMES
If anyone knows the Pantone number for DEC blue, that would be great.
All I ever saw were references to a DEC standard for corporate colors, but I never saw the standard itself. Perhaps that mentioned Pantone numbers. If not, I wonder what it used instead...
paul
On Jul 17, 2012, at 2:29 PM, Mark Benson wrote:
Can anyone provide me with a swatch or sample of which DEC blue you think I ought to use for the blue Wiki theme? There are many different shades of blue used by DEC over the years and I'm a little confused :)
--
Mark Benson
http://DECtec.info
Twitter: @DECtecInfo
HECnet: STAR69::MARK
Online Resource & Mailing List for DEC Enthusiasts.
Can anyone provide me with a swatch or sample of which DEC blue you think I ought to use for the blue Wiki theme? There are many different shades of blue used by DEC over the years and I'm a little confused :)
--
Mark Benson
http://DECtec.info
Twitter: @DECtecInfo
HECnet: STAR69::MARK
Online Resource & Mailing List for DEC Enthusiasts.
