| Title: | DEChub/HUBwatch/PROBEwatch CONFERENCE |
| Notice: | Firmware -2, Doc -3, Power -4, HW kits -5, firm load -6&7 |
| Moderator: | NETCAD::COLELLA DT |
| 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 |
I have received a voicemail from one of NPG Partners here in Dallas,
ie, Pioneer Technologies. The message is from one of their SEs. He
says they sold a DECswitch 900EE to a customer that had a clogged up
ethernet, so they used the 900EF to provide some separation of
different workgroups.
He says the network is slower now than it was prior to the installtion
of the DS900EE.
OK, OK, I know this is probably a configuration issue of some sort and
I will call these guys Monday to see what the "real" configuration is
and what they actually have done.
My question is around the enabling of filtering on either of the
DECswitch 900 products. The Pioneer SE first spoke with some of the
local Digital MCS/NIS folks and he was told "do not turn on any
filtering or performance will go down the tubes".
Is the above statement true? I know the DS900EE can pass 45Kpps, ie,
max out the attached ethernets. I know when you turn on an addtional
feature such as filtering, performance will suffer to some extent.
DO we have any test data to show us what type of performance hit
turning on flting will do to a DS900?
Thanks,
Mark
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 2117.1 | NETCAD::ANIL | Mon Mar 20 1995 10:46 | 22 | ||
> The Pioneer SE first spoke with some of the
> local Digital MCS/NIS folks and he was told "do not turn on any
> filtering or performance will go down the tubes".
>
> Is the above statement true? I know the DS900EE can pass 45Kpps, ie,
> max out the attached ethernets. I know when you turn on an addtional
> feature such as filtering, performance will suffer to some extent.
No -- the filtering lookups in the DECswitch are done in a way
that has no visible impact on performance. The MCS/NIS people really
need to check before making statements like that to customers.
Many router vendors do filtering in a sequential manner.. that is,
filters are added to a list which is then checked sequentially against
every packet received. This would cause performance to degrade because
of the resultant extra processing on each packet. However the DECswitch
performs address and protocol filtering lookups on every packet; it
assumes that these are set up, as opposed to the above which assumes
they are not. (The impact to the internal design is that we've thrown
lookup memory at the problem, to ensure that there is no degradation.)
Anil
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| 2117.2 | Thanks. | DPDMAI::DAVIES | Mark, SCA Area Network Consultant | Mon Mar 20 1995 12:29 | 8 |
Thank you very much for the response. This is great news on how we
implemented filtering on our DECswitches.
This info is the type which needs to be presented to NPG Sales reps and
SEs so that this can be used in Sales situations.
Mark
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