[HECnet] Multinet circuit costs

[Steve Davidson]

The circuit costs here are set to 4 for LAN and 3 for tunnels.   The issue may be that if a node (at the end of the chain so to speak) has 2 tunnel links of the same cost and that the final destination costs the same I could see where DECnet *might* get confused.   Let's look at the following contrived example:

FRUGAL:: connects to LEGATO:: - cost of 3
FRUGAL:: connects to SG1::             - cost of 3

LEGATO:: connects to GORVAX:: - cost of 3
SG1::             connects to GORVAX:: - cost of 3

Fred, on node FRUGAL:: tries to copy a (large) file from GORVAX:: to FRUGAL:: *may* see some issues.   On the other hand if Fred chooses to favor SG1:: over LEGATO:: (cost wise) he should not see any problems:   Ex:

FRUGAL:: connects to LEGATO:: - cost of 3
FRUGAL:: connects to SG1:: - cost of 2

The route is guaranteed to be the same for the entire transaction.   It will be (using poor man's routing to demonstrate) FRUGAL::SG1::GORVAX:: at a cost of 5, not FRUGAL::LEGATO::GORVAX:: at a cost of 6.

-Steve

________________________________

From: owner-hecnet at Update.UU.SE on behalf of hvlems at zonnet.nl
Sent: Thu 1/5/2012 10:43
To: hecnet at Update.UU.SE
Subject: Re: [HECnet] Multinet circuit costs



PS
I can copy to Legato alright.

PPS
I did check the netserver.log files and found nothing out of the order.