need help in Applying QOS to an ISP on ASR 1002

[Dr.X]

Hi

i want to ask 

if someone gave me CIR with 900Mbps internet upload & download

the question is being asked is.

when the congestion occurs ( when my bw is full)

where does the congestion occur ??

on my router ?

or ISP router ?

or the internet ?

or other place ???

that issue is deiving me mad , because im doing qos on my side to guarantee bw and shape  but it dont give me a result ?!

i mean , the qos is maching ok and soo nice

but ..... the performance.

agian

the performance as there is no guarantee and no bw guaranteed.

i asked an expert and told me you have to ask  your provider to do that thier side ?!!!  im really shocked to hear that ... he told me that congestion occurs outside my router.

so , im here to ask agian and agian.

what choices i have to fix my issue ??

wish to help

regards

[Dr.X]

Ok, its better for you to define a shaper for up to 900M at your side. so possibly your traffic will not be dropped then at the SP side if it Police your traffic as well.

secondly you define bandwidth allocation for your different traffic classes as per your requirement within that shaper you defined already as a parent one.!!!!

well , i already suggested that soution , but others says it is not the solution.

plz have a look on previous replies

regards

[Joseph W. Doherty]

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

Sometimes others are incorrect; sometimes not too.  ;)

A shaper could be part of your solution.  With it, you can manage outbound traffic congestion.  (You create an artificial bottleneck before the ISP's bottleneck.)

The problem is, a total solution also needs management of inbound traffic congestion.  This might be easily done if your provider would work with you on a QoS solution, but most won't.

So, the only "solutions" left to you are, having enough bandwidth that inbound congestion isn't much of a problem, or using something that can manage inbound traffic bandwidth consumption.

Cisco router QoS can, somewhat, manage inbound congestion, but not very well.

[Dr.X]

Hi , i appreciate all the replies and help.

but again , im talking about ADSL ISP which  have 900M upload and 900 M download.

so , i dont need any QOS for upload (outbound ) because i have a lot of free bw in it.

the only issue is the download (inbound) .

let me ask a question , 

does it  matter for me , if my provider were doing shape or police ??

another question , does shape or police occurs after the link exceed the value ? or it occurs before ?

or they are same in corresponding to me ?

[Joseph W. Doherty]

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

900 Mbps on DSL?  If same up and down, that would be sDSL, not aDSL?

If 900 Mbps both up and down, you have plenty of BW up (out) but not down (in)?

(You don't need to answer any of the above; just wondering.)

For you, it matters little whether a provider shapes or polices if the provider doesn't also have a congestion management policy for shaped congestion.  That said, depending how a policer is configured, and the kind of traffic subject to it, you might lose more packets with that rather than a shaper.  It's also much more likely a provider will police rather than shape.

Both policing and shaping or independent of actual link bandwidth.  They only make sense when configured for less than physical bandwidth.  They usually won't engage until after there's some physical link congestion.  When they engage depends much on how they are configured.

Again, from your perspective, you'll just be limited to x speed, inbound.

[rtnet_4820]

Definitely ISP configure a Policer if your physical link bandwidth is much higher than what the CIR is. Like your tx-ring is of 10gig and the CIR is 1gig, then ISP will configure a policer for you as per your CIR not to exceed but that drops too much traffic in a ms as per the 10gig interface.

Secondly when the tx-ring or the hardware interface gets full it invokes the shaper and shaper when not capable of handling the exceeded traffic than invokes the Queuing strategies. Lastly comes the avoiding  techniques like TD OR WRED.

 Configure a shaper for the outbound traffic, while a Policer for Inbound traffic or both.

[Joseph W. Doherty]

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

I agree with Reza that bandwidth usage monitoring reveals whether you're filling the link or not, however I'm of a different opinion about whether such information, alone, indicates whether you need to increase bandwidth or not.

A better "acid" indication, whether congestion is an issue, are there drops?

Just the other day I was investigating a switch that local support was about to replace because users were reporting very poor file copy performance on just it.  Users were reporting file copy rates of about 5 to 10 Mbps on a 100 Mbps port.

Looking at recorded drop rates, not just bandwidth consumption, showed very high bursts of drops.  Further investigation found switch QoS had been misconfigured.  Correcting QoS configuration allowed transfer rate to jump to about 98 Mbps.

[Joseph W. Doherty]

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

"what choices i have to fix my issue ??"

Often very few when working with the Internet.  A common choice, especially for Internet, is to acquire more physical bandwidth.

A "good" QoS policy is often a great choice, but unless you can control the QoS end-to-end, its effectiveness can be greatly reduced.  It might be useful for your egress toward the Internet, but basic QoS features are very limited in what can be done with ingress from the Internet.

Depending on your Internet usage, a caching appliance and/or traffic shaping appliance might allow you to use your existing bandwidth much more effectively.

PS:

You say you have an QoS policy now, and shape?  You might want to post that policy, your circuit particulars and your goals for comments whether your QoS policy might be improved.