• Linus Luessing's avatar
    batman-adv: ELP - adding basic infrastructure · d6f94d91
    Linus Luessing authored
    The B.A.T.M.A.N. protocol originally only used a single
    message type (called OGM) to determine the link qualities to
    the direct neighbors and spreading these link quality
    information through the whole mesh. This procedure is
    summarized on the BATMAN concept page and explained in
    details in the RFC draft published in 2008.
    
    This approach was chosen for its simplicity during the
    protocol design phase and the implementation. However, it
    also bears some drawbacks:
    
     *  Wireless interfaces usually come with some packet loss,
        therefore a higher broadcast rate is desirable to allow
        a fast reaction on flaky connections.
        Other interfaces of the same host might be connected to
        Ethernet LANs / VPNs / etc which rarely exhibit packet
        loss would benefit from a lower broadcast rate to reduce
        overhead.
     *  It generally is more desirable to detect local link
        quality changes at a faster rate than propagating all
        these changes through the entire mesh (the far end of
        the mesh does not need to care about local link quality
        changes that much). Other optimizations strategies, like
        reducing overhead, might be possible if OGMs weren't
        used for all tasks in the mesh at the same time.
    
    As a result detecting local link qualities shall be handled
    by an independent message type, ELP, whereas the OGM message
    type remains responsible for flooding the mesh with these
    link quality information and determining the overall path
    transmit qualities.
    
    Developed by Linus during a 6 months trainee study period in
    Ascom (Switzerland) AG.
    Signed-off-by: default avatarLinus Luessing <linus.luessing@web.de>
    Signed-off-by: default avatarMarek Lindner <mareklindner@neomailbox.ch>
    Signed-off-by: default avatarAntonio Quartulli <antonio@open-mesh.com>
    d6f94d91
types.h 48.1 KB