[c-nsp] Detection of Link Performance degradation

[Arie Vayner (avayner)]

Dracul,

If the link is not utilized, or you have periods of time you know the
link is not utilized, you could use an IP SLA probe to download (using
HTTP/FTP) some file across the link, and measure the time it takes over
time...

Not sure how this is interesting on live networks, but it would do what
you need.

On live networks people usually use the IP SLA feature to monitor the
link performance using the delay/jitter values as well as application
level response time...

IP SLA info can be found here:
http://www.cisco.com/en/US/products/ps6350/products_configuration_guide_
book09186a008043be2d.html

Arie 

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Dracul
Sent: Monday, October 29, 2007 10:44 AM
To: lists at visp.me.uk
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Detection of Link Performance degradation

Hi Steve,

I was looking more into this scenario:

ex. actual line is 2MB, no usage, now how can one tell if the actual 2MB
link is degrading its speed? Like is there a real time detection that
download speed has actually degraded from the 2MB config?

hope this is clearer. thanks!

regards,
chris

On 10/29/07, Steve Wright <lists at visp.me.uk> wrote:
>
> > Is there a way you can have CISCO routers,switches to proactively 
> > detect that your link is degdrading the actual bandwidth its 
> > supposed to have?
> > for example, within a period of 24hours. given a 2MB leased line
link.
> > How
> > can you analyze that the bandwdith has degraded with reference to 
> > the 2MB speed? I know MRTG is one way of analysis. Is there a more 
> > proactive tool than that?
>
> Not quite sure what you're asking... whether the link is degrading in 
> what respect?
>
> From the way you have worded your question, I would guess you're 
> actually asking about utilisation and monitoring this proactively.
>
> MRTG should be good for this, if you set the thresholds to alert you 
> when utilisation goes over a certain parameter defined by yourself.
>
> With regard to latency or the such to identify if a link if going bad 
> you could setup various probes on the routers; gives 'Cisco IP SLA' a 
> bash in Google and it should return some useful docs on configuring
this.
>
> S
>
>


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