[c-nsp] Detection of Link Performance degradation

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      Cisco IOS OER Managed Network: Central Policy Database

The master controller continuously monitors the network. The master 
controller maintains a central policy database where it stores collected 
statistical information. The master controller compares long-term and 
short-term measurements. The long-term measurements are collected every 
60 minutes. Short term measurements are collected every five minutes. 
The master controller analyzes these statistics to determine which 
routes have the lowest delay, highest outbound throughput, relative or 
absolute packet loss, relative or absolute link cost, and prefix 
reachability to analyze and optimize the performance of monitored 
prefixes and to distribute the load from over-utilized exit links to 
under-utilized exit links.



Gert Doering wrote:
> Hi,
>
> On Mon, Oct 29, 2007 at 04:43:38PM +0800, Dracul wrote:
>   
>> 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?
>>     
>
> A 2 mbit line is a 2 mbit line is a 2 mbit line...
>
> So how is it supposed to "degrade"?
>
> (Of course there are situations when you have, for example, an ATM VC 
> with non-guaranteed bandwidth - but there is no way the router can know
> whether the end-hosts are just not feeling like sending more than half
> the available bandwidht, or the network is throttling (incoming)
> traffic...)
>
> gert
>
>