Re: OLSRv2 - suggestions for enhancing message forwarding

  Teco Boot wrote:

>This is the classical "back-to-back radio relay" topology,
>that is often used in military networks. The enhancement
>is not that important for Ethernets, as there would not be
>a constraint in capacity.
>Where a wireless segment connects many of these clustered
>routers, all routers on the segment become MPR, for both 
>the Ethernet and "back to the wireless segment" interfaces. 
>Here, the unneeded overhead is unacceptable, especially where 
>low capacity - long range radios are used in a segment with 
>large number of the clustered routers.
>
>My proposal makes the "interface type" self-learning.
>

Absolutely.  Often it won't be known in advance whether a MANET
will form a single hop network (with diameter 1).
But even if the MANET has diameter 2, routers that are not on
the edge will still have a neighbor set that includes all other
routers on the MANET segment, so both of the proposed modifications
will still help a lot.

Moreover, the scheme with multiple MPR types can be very helpful
even if the MANET segment has a large diameter.  This is because
each MANET router will still select all MANET neighbors as MPRs
(because of the Ethernet interfaces).  With the proposed scheme,
only a few of these neighbors will be of type MPR_all_interfaces,
and the rest will be of type MPR_other_interfaces.

Richard