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Cell Relay Retreat>List Archive>month:1998-Apr> msg00241



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RM Cell Ordering vs Data Cells

  • From: gstein@sntc.com
  • Date: Fri, 24 Apr 1998 15:44:22 -0600

TM 4.0 section 5.10.6 allows switches to transmit RM cells out of sequence
with respect to data cells.  Thus, to minimize the transit path length and 
enhance feedback, a switch may elect to forward RM cells as quickly as 
possible, bypassing any associated data cells that may be queued.  

What
problems may this technique create?

It is quite obvious that the Nrm
parameter seen by downstream agents will 
appear modified, even potentially
violating the min and max of 2 and 256 
respectively.  However, Nrm applies
to source behavior, as specified in 
5.10.4, and is not defined for switch
behavior.

Would destinations (particularly SARs) have a problem handling RM
cells with 
a very low Nrm (1 or 2)?

Any comments or opinions would be
appreciated.

Gary Stein
Senior Design Engineer

SNT (Switched Network
Technologies, Inc.) 
3550 Annapolis Lane North	
Suite 10  
Plymouth, MN
55447-5333 
http://www.sntc.com

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