[HECnet] Multinet circuit costs

[Steve Davidson]

Well...

Sampsa's network and mine have been running both the bridge and the tunnels for a very long time.   As long as we manage the costs (keep the tunnels lower cost) things run great!   We still need to determine what those costs should be.   I have some ideas that I will share in a follow-up message based on experience.   Multiple paths are not a problem, DECnet sorts this out.   Once we get something that resembles a map then we can set a costs policy and things WILL be back on track.

-Steve


________________________________

From: owner-hecnet at Update.UU.SE on behalf of hvlems at zonnet.nl
Sent: Thu 1/5/2012 02:48
To: hecnet at Update.UU.SE
Subject: Re: [HECnet] Multinet circuit costs



DECnet supports multiple paths between hosts (e.g. Ethernet and CI) and circuit cost is a way to favour one path over another.
In situations where a bridge and a Multinet TCP tunnel operate in parallel that still leads to multiple paths. Even if the TCP tunnel has the lowest cost the ethernet path will send out multicast messages. I think that is the reason LEGATO has issues (cannot copy files to area 44) and possibly why MIM now sees a different world.
The map shows several parallel paths. I'd suggest   in stead of modifying cost it is better to have either the bridge program or a TCP tunnel per site for a couple of days and see what happens.
Hans
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Van: Johnny Billquist
Afzender: owner-hecnet at Update.UU.SE
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Onderwerp: Re: [HECnet] Multinet circuit costs
Verzonden: 5 januari 2012 00:48

On 2012-01-04 23.31, Steve Davidson wrote:
Have we decided on what the circuit costs should be set to for the
Multinet circuits? I just did:
NCP TELL MIM SHOW KNOW AREAS
and discovered that MIM's view of the world has changed. From what I can
tell it is due to changes is circuit costs. I have made no changes at my
end. I was waiting for consensus before making any changes.
-Steve

I don't know if a general consensus was reached, but I agree with the
idea expressed. When you have both the bridge, and Multinet DECnet
tunneled, make the costs for the Multinet circuits lower.

Yes, the changes made by some have had effect on how the routing from
MIMs point of view looks. And I think it's an improvement. A few
destinations farther away that I tested against were noticeable faster now.

              Johnny