General : STM always enforced?

[Kushan]

Originally Posted by everyday

I also can go just under 20GB before it kicks in that's non stop over 15-20 mins

That might be because it's measured in 15minute intervals.

Originally Posted by Kushan

That might be because it's measured in 15minute intervals.

Which was already common knowledge but thanks for the clarification

[horseman]

Originally Posted by everyday

Which was already common knowledge but thanks for the clarification

AFAIK this is only common knowledge as the "default sample interval" on Cisco CMTS and is in fact configurable on each chassis(or even linecard) between 1 and 30minutes.

Additionally there are many more configurable parameters including "average sampling rate frequency", "default sliding window period of 6hrs" and a default "Penalty Period" that defaults to 7 days!

Remember that STMv1.3 also has a 40 enforcement rule limitation and you require 1 rule for upstream with each service tier QOS and again for downstream, with potentially different QOS for residential & business classes and throw in various legacy tiers for mixed mode DOCSIS 1.x and DOCSIS 3 CM's then it's quite possible the combinations could exceed the available 40 rule limit!

While it makes administrative sense to apply a common configuration I've not yet seen any authoritative NTL/VM statement in last decade+ that actually stipulates what IOS version(and thus STM version - because STMv1.2 only had a 20 enforcement rule limit), linecard type, or specific chassis configuration is in use across all the areas?

Furthermore in some tests I performed sporadically attempting to saturate both down/upstream on occasions over a couple of previous years with some discussion with Igni I raised two hypotheses that basically potentially predicted that VM may well disable rule enforcement on mac domain basis just prior,during and immediately after major re-segmentation in order to load-balance prior to re-instating STM!
I'm still awaiting a conclusive answer or plausible counter to those theories so would welcome any alternative explanations via this thread?

In the unlikely event anyone else is at all interested in the methodology involved then here's an example Cisco reference > Subscriber Traffic Management for the Cisco CMTS Routers

As a minor aside, along with copious DOCSIS tutorials I found this Cisco paper (a tad aged and USA DOCSIS centric and thus not euroDOCSIS) which is really good foundation document (IMHO) >
CAPACITY PLANNING AND DOCSIS TRAFFIC ENGINEERING

[Kushan]

Just to clarify, a few VM people have confirmed that it's measured in 15min intervals.

Yes every 15 mins and then when your in STM it's like once every 4 hours - i did 6.3GB and I was in STM for just over 4 hours. That can't be right.

Sooner they totally turn this crud off the better.

[Kushan]

When was that? There was an issue a few months back but as far as I could tell it was largely resolved. It should now be measured every 15mins and at most last 2 hours (unless you continue downloading).

lastnight. I was hit for 4 hours + Went on at 4:37PM was on till just after 9

honestly. I expect and accept 1-2 hrs but 4 is a bit naughty!

[Sirius]

I just wish they would give us the ability to check how much we have used in real time

I've had to get a 20GB file down for tomorrow so I have micro managed it doing 4.5GB per 2 hours and I don't think I have hit it tonight.

I agree, it cant be that hard to impliment?

---------- Post added at 22:41 ---------- Previous post was at 22:19 ----------

So what happens if you start a download at say 10:50? Will it check at 11pm or not check and just go off?

[Kushan]

I do not know if it checks at 11 or not, but I suspect it would. Then again, I don't know if the STM goes on beyond 11 or if it's all disabled then. Be worth a test!

[kwikbreaks]

On the 20GB download - I'd just kick it off and let it take its chances if I wanted it quickly or schedule it out of peak times. I really CBA to spend time and effort worrying about and pandering to the STM.

[Kushan]

Agreed. If your objective is to get a file as quickly as possible, it's faster to download it at max speed, through STM and keep going until it's finished. Avoiding STM means dropping your average speed to below that of STM anyway.

Originally Posted by Kushan

I do not know if it checks at 11 or not, but I suspect it would. Then again, I don't know if the STM goes on beyond 11 or if it's all disabled then. Be worth a test!

Ill test it tonight but I believe it goes on after 11.

Ill make sure I hit 6.1GB before 10:30/10:45 so it can kick in.

Going to start downloading now.

---------- Post added at 22:10 ---------- Previous post was at 22:04 ----------

I've done enough to,judging by previous times, to be stm'd for 4 hours(ish).. will let you know what happens..

Sorry Kush unable to complete the test, because STM appears to be off. Or its on but hasn't seen the 20GB i've done over the past 25 mins (so it should have checked anyhoo?).

someone said to me the other day STM was off because my IP hadn't been flagged? I had a billing change earlier and a reboot. But surely it's not done on which IP's download the most? Because all I see is people saying they have no STM but have downloaded the internet. It's so random this on and off it's should be one or the other and stick to it (preferably off tho!)

---------- Post added at 23:08 ---------- Previous post was at 22:10 ----------

Scrub that!

I have been STM'd at some point since my last post. it's still on after 11PM - so there's your answer!

[BenMcr]

Originally Posted by everyday

I have been STM'd at some point since my last post. it's still on after 11PM - so there's your answer!

The absolute latest you could be managed is 00:59