Larry's comments are right on.  We have a client doing SNA over frame relay
and we are using Vanguard MP routers (Motorola) and that is exactly what
the Vanguard units do.  The "spoof" (a technical term) the AS400 and the
remote 5494 into thinking SNA frames are being passed from end to end.
They work very well.
Carl

At 10:53 PM 5/10/98 -0400, you wrote:
>mcrump@ballfoster.com wrote:
>> 
>> We have 20+ 5494's that we just converted from a private pt to pt
network...
>> 
>> To the AS/400 and the 5494's they look like they are attached to a LAN.  We
>> are bridging the SNA traffic....
>> 
>  If the environment is as you describe it with SNA bridging I believe
>you will never have solid reliability.  The problem being that SNA is
>timing out when the 'clound' (frame relay network) gets busy -
>Especially if your CIR is low and traffic is high.  Bridging will simply
>carry the SNA polling over the cloud so when the clound is busy the
>responses take too long and in some cases actually never get there.
>
>  To solve this you really need routers that are using DLSW (Data Link
>Switching) instead of bridging.  DLSW on the router nearest the AS/400
>will 'lie' to the AS/400 by responding to the AS/400's polling, the
>routers on the far end will do the same for the 5494's.  Only after the
>routers finally give up on communicating to one another (such as when
>CISCO stuff on AT&T's Frame go casters up) will the local router finally
>tell the AS/400 that it cannot contact the 5494's.  In the mean time
>even when the 'cloud' is swamped the AS/400 believes that the 5494's are
>still there and happy.  This has the desireable side effect of reducing
>WAN traffic because all those SNA polls don't hit the cloud.
>
>  Now if you are already using DLSW or similair technology then I'm all
>wet and you need to raise some of those time out values.....
>
>  Larry Bolhuis
>  Vice President
>  Arbor Solutions, Inc
>  Grand Rapids, MI
>
>> 
>> Michael Crump

>> Technical Project Leader
>> 
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Carl J. Galgano
http://cgalgano.home.mindspring.com
mailto:cgalgano@ediconsulting.com
EDI Consulting Services, Inc.   
540 Powder Springs Street
Suite C19
Marietta, GA 30064
770-422-2995
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