Conference azur::mcc

5279.0. "Frame Stip mode on DECconcentrator 500s" by GADWAL::WOESTEMEYER (Why??...Why not!!!) Tue Jun 29 1993 11:53

A customer raised an interesting question, to which I an searching for
an answer.  He has 4 DECconcentrator 500s.  Looking at line characteristics
on them 3 show the frame strip mode as BRIDGE STRIP, the 4th as S/A mode.
The differecnes in the concentrators are that the 3 showing 'bridge strip'
are at V3.2.1, the S/A Strip is at V3.1.

Using DECelms on V3.2.1 I also get the Bridge Strip value.  Using DECmcc 
and the ELM modules an undocumneted value, 'Frame Content Independent', is
returned.  Looking at the DECelms manual it would appear that Bridge Strip 
mode should only be seen on a bridge.  The DECmcc concentrator use manual 
indicates that only S/A mode is valid.

The customeris getting this information via the OBM port.  I would have 
entered this in the FDDI ndes file, but MOUSE has been unreachable for 
several days and then there is the fact that MCC is not reporting it 
correctly either.

Any Ideas out there?
Steve Woestemeyer
CSC/CS - Network Support Team
----------------------------------------------------------------------------

Device Characteristics as of   29-JUN-1993 08:34:09
Name DC500_1,   Address   08-00-2B-16-8D-D1

Node ID:                                      08-00-2B-16-8D-D1
Software Implementation Type:                 DEFCN
Software Version:                             3.2.1   
ROM Implementation Type:                      DEFCN
ROM Version:                                  .0
Upline Dump Switch:                           N/A
Preferred Dump Host:                          N/A
Last Dump Host:                               N/A
Reset Defaults Switch:                        Disabled
Update Switch:                                False
IP Address:                                   16.63.16.252
Gateway Address:                              
Trap Address Entries:                         


Line Characteristics for Line 1  as of   29-JUN-1993 08:34:18
Name DC500_1,   Address   08-00-2B-16-8D-D1

Link Address:                       08-00-2B-16-8D-D1
Port Number:                        1
Datalink Version:                   1.0.0
Datalink Type:                      FDDI Ring
Station ID:                         00-00-08-00-2B-16-8D-D1
Station Type:                       Dual Attachment Concentrator
Management Sets Allowed Switch:     Enabled
Maximum TRT:                        167.77216 ms
Requested TRT:                      7.98720 ms
Valid Transmission Time:            2.62144 ms
SMT Version ID:                     2
SMT Resource Index:                 11
Frame Strip Mode:                   Bridge Strip



CONCENTRATOR KEROON_NS:.cn.dc500-1 LINE 1 
AT 29-JUN-1993 08:35:52 Characteristics

                       Frame Strip Mode = Frame Content Independent
    

	This behaviour is documented in FDDI conference ( I don't know why it 
	is unavailable ... ) as a change between version 3.1 and 3.2 concerning
	the Ring Purger.

	The Frame Strip Mode deals with the way to remove frames from the ring.
	1/ Source Address :
	   Source Address = Device Address
	   ==> This device is in charge of this frame removal.

	2/ Frame Content Independent :
	   Concerns the authorization for a device ( Ring Purger characteristic
	   enabled ) to remove frames with a source address different from its 
	   MAC address.
	
	So to summarize :
		until 3.1 :
			Frame Strip Mode = SA Match ( ELM and ELMS )
		since 3.2 :
			Frame Strip Mode =  Bridge Strip ( ELMS )
			Frame Strip Mode =  Frame Content Independent ( ELM )

	As far as I remember, this is not documented in the release notes.

	Guy.