On Fri, Feb 20, 2015 at 9:51 AM, Teco Boot <[email protected]> wrote:
>> At the moment I just get the ethernet port link speed... that is not
>> really good for switched ports, but its better than nothing.
>> http://olsr.org/git/?p=oonf.git;a=blob;f=src-plugins/generic/eth_listener/eth_listener.c;h=1646a60722d60c54d7ab6b5df2e67fba7d52de22;hb=master
>>
>> If you have hardware with a built-in switch that can report the
>> link-speed, it would be easy to add code that integrates this (and
>> some traffic statistics).
>
> Your SW depends on ethtool, right? Not a problem, this is implementation 
> detail. Link speed probes could be added for verification the ethtool 
> provided info.

No, it does directly call into the operation system. Calling a
different executable and parsing the output is a good source for
subtle bugs.

> And yes, I didn't mean we cannot use the 80% solution. What I want to say is 
> that the Homenet Routing Protocol shall be able to use all the link metrics 
> it can get.
>
> I am still worried about loops caused by dynamic link metrics used by a link 
> state routing protocol. For me, this is the major difference between ISIS and 
> Babel. Thats because I don't code the protocol. If I was, I would be worried 
> about the non-IP transport in ISIS.

It is a matter of metric stability... so you need a good hysteresis
and post-processing to make it work.

Henning Rogge

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