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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

3585.0. "Rate Limiting / Threshold settings" by ASABET::nqsrv232.nqo.dec.com::parker (Emerson Parker) Mon Jun 03 1996 16:02

I am a new employee with Digital and have a few simple questions.

On the portswitch 900TP or CP are there any "Rate Limiting" features?  Or perhaps a 
"threshold" that will disable a port for X amount of time if the threshold has been met?

We have a customer that is looking for a way to stop heavy broadcast storms that always brings 
 his segment utilization way up.   

If these features are only found in a switch, the customer is willing to buy more hardware.

Thanks,

               Emerson Parker @TMO

T.R	Title	User	Personal Name	Date	Lines
3585.1	Switches can limit the damage.	CGOS01::DMARLOWE	Have you been HUBbed lately?	`Mon Jun 03 1996 16:45`	10
	What protocols do they think are causing broadcast storms? Appletalk is the only one I really ever hear about now. The repeater modules can show you which ports are running high at the time observed. Only a switch can actually rate limit broadcast storms. At least this stops the storm from spreading thru the entire network. The 900 repeater's counters, primarily the error counts may give hints as to a NIC card going bad. dave
3585.2	portswitch != decswitch	SLINK::HOOD	Your bad news bear	`Mon Jun 03 1996 17:05`	13
	Emerson, Welcome! The portswitch modules are repeaters. The "switch" part refers to switching ports to individual lans within the hub. To do what your customer needs, you need a DECswitch or PEswitch. These are bridge-switches that can do protocol filtering and rate limiting. Tom Hood clearVISN eng
3585.3	More info on the customer's network	ASABET::nqsrv318.nqo.dec.com::parker	Emerson Parker	`Mon Jun 03 1996 17:09`	7
	The user is not sure of the protocol in question. They are a big LAT house with about 2000 terminals comming in to ONE ethernet segmnet. They have 8 Alpha servers on 2 FDDI rings as well as a single ethernet connetion going to all the users. I'll get more info.