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Conference 7.286::fddi

Title:	FDDI - The Next Generation

Moderator:	NETCAD::STEFANI

Created:	Thu Apr 27 1989
Last Modified:	Thu Jun 05 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	2259
Total number of notes:	8590

1174.0. "NG Sniffer bad SMT ?" by LSNCSC::BRUNNER () Wed Dec 08 1993 13:04

    Hi All,
    
    Anybody having a Network General Sniffer connected as SAS or DAS
    to an FDDI ring somewhere working nicely ?
    
    I am trying to do a ring with 	a DECNIS V2.2 (SMT6.2)
    					a DEFCN  V3.3.1 (SMT 7.2)
    					a DEFCN  V3.0 B (SMT 6.2)
    and NG Sniffer SAS on one of the DEFCN.
    
    The NG Sniffer is hung when it tries to enter the ring.
    If I downgrade the 1st DEFCN to 3.0B it doesn't hang but updates
    the screen every ~2 min instead of every second. The NG Sniffer
    should detect automatically if SMT is at 6.2 or 7.2.
    The Sniffer is working correctly if I do my ring with only the
    DECNIS and the Sniffer as a DAS.
    
    Nice to hear comments
    Thanks Walter

T.R	Title	User	Personal Name	Date	Lines
1174.1	Turn off SMT?	35405::MCELWEE	Opponent of Oppression	`Wed Dec 08 1993 14:34`	6
	Can you configure the Sniffer as a DAS repeater i.e. SMT disabled? The HP Advisor I used could be a DAS, Dual Attached Repeater, or Dual Attached Monitor, FWIW. Phil
1174.2	Problem with VOID frames	ANTIK::WESTERBERG	Stefan Westerberg DS Stockholm	`Wed Dec 08 1993 15:33`	8
	Hi, the problem could be that your ring has a very low load. When this happen there is basicly only VOID frames on the ring at a rate around 50k/s. This is then to much for the 486 CPU in the pc. But if you have a load of >1% of "real" traffic then you should get a more accepteble performance from the sniffer. You could get around the problem by removing VOID frames in the capture filter setup. /Stefan
1174.3	Thanks .2 is the answer	LEMAN::BRUNNER	FF Frame Finder	`Fri Dec 10 1993 10:02`	8
	Thanks to all, .2 was the answer. It looks like the Sniffer can handle only 45-50k frames/sec (from Network General at Menlo Park). The analyzer should be capable of handling SMT 6.2 & 7.2 nodes. NG said they are ANTC compliant.