[Olsr-users] Multi-Topology Routing for OLSR?

Henning Rogge (spam-protected)
Thu Aug 2 22:37:48 CEST 2012

On Tue, Jul 31, 2012 at 7:45 AM, Joerg Pommnitz <(spam-protected)> wrote:
> ----- Original Message -----
>> From: Henning Rogge <(spam-protected)>
>> To: Joerg Pommnitz <(spam-protected)>
>> CC: "(spam-protected)" <(spam-protected)>
>> Sent: 15:45 Dienstag, 31.Juli 2012
>> Subject: Re: [Olsr-users] Multi-Topology Routing for OLSR?
>>>  How would you implement this (on top of OLSRv1)?
>> You would generate a new Hello and TC format if you want to use
>> different metrics for topologies.
> I assume "metric" means LQ metric in this context, right?

yes... or define a "link cost" for each topology... either way, you
need multiple metric values for each link.

> If so, then I don't quite understand why you mix "multi-topology" with "different metrics".
Because quite a lot of people consider "multi topology" a routing
protocol running on different sets of metrics at the same time. Having
some "high datarate" and one "low delay" topology for example.

> IMHO these two topics are mostly independent of each other.
> If one wants to use different metrics in different topologies one would need to either send hello messages for each topology or include a multiple metrics into the messages. Is this what you meant?
> And I thought that I would need to change the HNA-messages as well, because not every
> HNA prefix should be visible from every topology.
Yes, might also need a change.

> I'm unsure about the MID messages. I think each address in a MID message should belong to one or more topologies.

Have not thought about MIDs/HNAs, because OLSRv2 doesn't have either of them.

>> It might also be necessary to have some filter involved between the
>> physical topology and the dijkstra algorithm.
>> And you need a way to store multiple dijkstra results.
> Yeah, I was already aware of this.
> Regards
>   Joerg

Henning Rogge

P.S.: I am at the IETF in Vancouver, so my time for working on
olsrd-dev is limited at the moment.

Steven Hawkings about cosmic inflation: "An increase of billions of
billions of percent in a tiny fraction of a second. Of course, that
was before the present government."

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