DLSW local peer cost vs. remote peer cost

From: Warner, Thomas S (thomas.s.warner@lmco.com)
Date: Fri Sep 06 2002 - 19:06:17 GMT-3

All-

DLSW allows the specification of a cost associated with each of the DLSW
remote peers (dlsw remote-peer 0 tcp x.x.x.x cost y) in addition to allowing
the remote peers themselves to have a local cost (dlsw local-peer peer-id
x.x.x.x cost y) specified. The default cost is 3 and the lowest cost is
always preferred in the event that unequal configured costs are present. I
have searched the DOC CD and searched portions of the archives but I am
having trouble finding out which value takes precedence - local or remote.
Consider the following scenario:

R6 needs to access resources that are accessible via both R1 and R2. R1 and
R2 both have an Ethernet interface that are part of the dlsw bridge group
with the resources attached to it.

         R6
        / \
       / \
      / \
     R1 R2

R6

dlsw local-peer peer-id 6.6.6.6
dlsw remote-peer 0 tcp 2.2.2.2 cost 1 (I prefer R2)
dlsw remote-peer 0 tcp 1.1.1.1 cost 2

R1

dlsw local-peer peer-id 1.1.1.1 (default cost of 3)
dlsw remote-peer 0 tcp 6.6.6.6
dlsw bridge-group 1

R2

dlsw local-peer peer-id 2.2.2.2 cost 4
dlsw remote-peer 0 tcp 6.6.6.6
dlsw bridge-group 1

So, will R6 prefer R2 because in R6's REMOTE peer statements, the cost is
lower for R2 than for R1 (1 vs 2) - or will R6 prefer R1 because R1's
LOCALLY configured cost is 3 which is lower than R2's LOCALLY configured
cost which is 4? Which takes precedence for circuit establishment - local
or remote? I would test this but I don't have access to another computer or
a lab where I'm located right now.

Let me emphasize that this is not a real life scenario so please don't bash
me for setting something up like this. I came up with this question based
on my readings from the doc cd under the DLSW Design Guide
<http://127.0.0.1:8080/cc/td/doc/cisintwk/idg4/nd2007.htm#xtocid209622>

Thanks all,

Tom Warner
Lockheed Martin Enterprise Information Systems
Computing and Network Services
email: mailto:thomas.s.warner@lmco.com

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