[Olsr-users] MIC metric [was: Mesh Networks Research Group]

[Henning Rogge]

Am Donnerstag 26 Juni 2008 08:57:20 schrieb Jens Nachtigall:
> Am Donnerstag, 26. Juni 2008 07:17 schrieb Henning Rogge:
> I think you would need quite a few changes to olsrd in incorporate MIC.
Yes.

> * 1st you have to have ETT
No... any other kind of "one link metric" (like ETX or other stuff) should be 
okay. Of course ETT would be better than ETX.

> * Then you need your own routing table for each incoming interfaces (I
> think only linux support this)
Yes, that might be a problem. Don't know what's the status of OSX/BSD in this 
matter...

> * TC messages must include all links of a node (atm, they only include the
> best link to a neighbor afaik)
And the Hellos must contain information about the channel/collision domain of 
the links.

> * You must construct an isotonic (virtual) network tree from the
> non-isotonic real one; and calculate SPF for each interface you have.
Yes. At the moment we are not sure how we handle this, most likely the virtual 
nodes will just exist as datafields in the real topology database objects.

> Just from memory, there a few minor things more. This means imho, that the
> metric would not just be pluggable but require quite a few changes to the
> core. But it is feasable ;-)
My plan is to split MIC into two parts... the link dependent part
  ( ETT * num(one-hop-neighbors)
and the addition to the SPF calculation to use a penalty to stay on the same 
link. This way we can keep the first part in a plugin and switch the second 
part on/off with a flag.

So we could use the "interference aware metric" part (without the "stay on 
interface" penalty) just as a metric plugin.

Am Donnerstag 26 Juni 2008 09:06:27 schrieb L. Aaron Kaplan:
> does anybody know how we can deal with LAN connections in MIC?
> Maybe it was in the paper but I don't remember.
Just keep a flag for each link/interface that it's "non colliding" so you 
neither need to calculate the one-hop neighbor count nor need to add a 
penalty to stay on the medium.

Henning

*************************************************
Diplom Informatiker Henning Rogge
Forschungsgesellschaft für
Angewandte Naturwissenschaften e. V. (FGAN) 
Neuenahrer Str. 20, 53343 Wachtberg, Germany
Tel.: 0049 (0)228 9435-961
Fax: 0049 (0)228 9435-685
E-Mail: (spam-protected)
Web: www.fgan.de
************************************************
Sitz der Gesellschaft: Bonn
Registergericht: Amtsgericht Bonn VR 2530
Vorstand: Dr. rer. nat. Ralf Dornhaus (Vors.), Prof. Dr. Joachim Ender 
(Stellv.)