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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

2211.0. "FDDI-Utilization with a NMS (e.g. PNV)?" by SUFNWB::SAIER () Mon Apr 24 1995 17:06

How can I get or calculate the Utilization of a FDDI Ring with a NMS,
e.g. POLYCENTER NetView?

With HUBwatch there is the possibility to get this FDDI Utilzation, using the
port 1 of a DECbridge900. I was looking at the ifInOctets and ifOutOctets of
the bridge interface 1, but I think this is only the traffic passing the
bridge, not the FDDI Utilization.

How does HUBwatch get/calculate this FDDI Utilization?

Best Regards,
Matthias

T.R Title User Personal
Name Date Lines

2211.1 Wow. Algebra at work! SLINK::HOOD April showers bring vacation days Mon Apr 24 1995 18:43 19

T.R	Title	User	Personal Name	Date	Lines
2211.1	Wow. Algebra at work!	SLINK::HOOD	April showers bring vacation days	`Mon Apr 24 1995 18:43`	19
	From the code... utilization = [busy time] / [total time] = [(1 - md) * 100] / [t] where m is number of times a token is seen by a station in t seconds. d is ring latency. t = timestamp2 - timestamp1 m = token_count2 - token_count1 d = ring_latency * 1e-9 timestamp<n> -> sysUpTime token_count<n> -> fddimibMACTokenCts ring_latency -> eMACRingLatency Tom Hood HUBwatch

From the code...

	utilization = [busy time] / [total time]
	            = [(1 - md) * 100]  / [t]

where m is number of times a token is seen by a station in t seconds.
      d is ring latency.

	t = timestamp2 - timestamp1
	m = token_count2 - token_count1
	d = ring_latency * 1e-9

timestamp<n>   -> sysUpTime
token_count<n> -> fddimibMACTokenCts
ring_latency   -> eMACRingLatency


Tom Hood
HUBwatch