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Conference netcad::hub_mgnt

Title:DEChub/HUBwatch/PROBEwatch CONFERENCE
Notice:Firmware -2, Doc -3, Power -4, HW kits -5, firm load -6&7
Moderator:NETCAD::COLELLADT
Created:Wed Nov 13 1991
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:4455
Total number of notes:16761

1745.0. "FDDI and Novell 802.3" by TROOA::LEONG () Thu Dec 01 1994 14:07

I have a customer who has installed some 30+ DECswitch 900EF connected in a 
FDDI backbone. They have turned on Novell 802.3 "translation". It works.

When they put and analyzer on the Ethernet, they found that the 802.3 
packets came out of FDDI as a 802.2 SNAP packet as well as a 802.3 packet - two 
packets came out for each one that went into FDDI.

They tried to filter out the 802.2 SNAP packet but it that caused both to 
disappear.

Is this normal behaviour for 802.3 translation?

Is there any configuration changes in the 900EF we can do to eliminate the 
extra packet?

I know it is not supported/recommended by Novell any more but they have 
some 3000 such PCs and it takes time to convert.

Any information is appreciated.
T.RTitleUserPersonal
Name		DateLines
1745.1NETCAD::B_CRONINThu Dec 01 1994 17:385
    
    What they should see on the Ethernet side is a RAW 802.3 packet only. I
    think that's what you mean by 802.3 packet. Some nodes will broadcast
    SAP announcements in multiple formats; that may be what they are seeing.
1745.2Broadcast only?TROOA::LEONGFri Dec 02 1994 11:0216
Bill,

Thanks for the quick response.

>    What they should see on the Ethernet side is a RAW 802.3 packet only. I
>    think that's what you mean by 802.3 packet. Some nodes will broadcast
>    SAP announcements in multiple formats; that may be what they are seeing. 

	Yes that's what I meant by 802.3.

	I take it then that this only supposed to happen when the orginating 
	packet is a broadcast.

	Is this why when they try to filter the packet, they get neither 
	through?
1745.3NETCAD::B_CRONINFri Dec 02 1994 19:464
    Yes, only broadcast, or multicast. If they filter, it will block all
    packets.