[WLANware] WLANware Digest, Vol 46, Issue 9

[ZioPRoTo (Saverio Proto)]

> 1.Some routers have an attached HNA network with some hosts.what is
> HNA network actually?

HNA (Host Network Announce)
A OLSR router can have an interface attached to a network where the
hosts do not talk the OLSR protocol. The OLSR router announces that
network with a HNA messages, so those hosts can talk to the rest of
the network using the OLSR router as a gateway.

> 2.ETX distance of nearest nodes are calculated.what is ETX distance?

ETX is a metric of wireless networks, Expected Transmission Count.

> 3.nodes or tree links are deleted in soft state fashion.what is soft
> state fashion?

Soft state means that if you don't refresh an information, that
information after
a defined time will expire.
So if I have a neighbor, and he sends me an Hello every 2 seconds, I
keep updating
that he is alive. When I don't receive hellos for a while I will
assume that the neighbor node
is not there anymore and I delete him. That is soft state.

> also found the implementation in
> http://gredler.at/hg/olsrd/rev/8e7887c1247f
> i am trying to understand the working mechanism of the code.

Please use git, we switched to a new repository back ago. It is linked
on http://www.olsr.org under del link repositories.

> so initially do we fix a core node for every multimedia stream in the
> network(probably during mesh create...).so whenever a core node for
> particular multimedia stream finds 1.IGMP poll message to request
> information about membership in all groups.(because nodes won't have
> exact record of group membership details..) or 2.response message to
> the IGMP request(i guess only one host from each group responds to the
> request message)..it'll send OBAMP alive message so that the node is
> added to corresponding OBAMP tree..and whenever a new node is added,
> core election algorithm is called and the node with lowest IP address
> is selected as the new core..

We run mesh create normally at the beginning.
We have to change MESH alive message syntax so we can add information
about the streams everynode has available.
The changes will be all in the tree creation procedures.

Please before getting too much in the details of OBAMP, try first to
read the more basic stuff about OLSR.

Saverio