Subject: Re: [manet] RE: WPF syndrome and MONAMI6

From: Alexander Morlang <[email-masked]>
Date: Fri, 18 May 2007 23:39:51 +0200

Teco Boot schrieb:
> Alexandru wrote:
>> Doesn't OSPF provide metrics in its LSAs (Link State Advertisements)
>> that can help a router select the best metric at it sees fit?  I think
>> it does.
> 
> [Teco] 
> OLSRv2 is still using hop count. Additions to OLSR could enhance that.
> 
> OSPF, including OSPF MANET is using cost based metric. For network types P2P
> and P2MP a metric can be set for each neighbor. OSPF MANET-interface is
> P2MP. Example in draft-chandra-ospf-manet-ext-04 (section 3.1.2.1  Router
> LSAs) shows selective metrics, this would be a solution for WPF.
> draft-ogier-manet-ospf-extension-08.txt is similar.
> 
> The question is how to update the metric dynamicly, this requires an L2 API.
> Or count missed hellos / LSA retransmits etc. 

Counting missing hello packets works, it is called "lq-extension" and is 
implemented in the olsr.org implementation.
http://www.olsr.org/docs/README-Link-Quality.html

It is used for community wireless networks with up to 650 nodes.

> 
> The question is adopting this mechanism by oyther MANET protocols, for
> example by TD and use RA-TIO path metric instead of hop count?
> And do we need rules for actual metric values set?
>  
> 
> 
> 
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