On Sun, Mar 1, 2015 at 11:14 PM, Curtis Villamizar <[email protected]> wrote: > RFC 6130 uses probes (hello message success rate).
No, it does not... at least not for calculating the link metric. > For example: If an AP sends 100 packets a second to a neightbor and 5 > drop it would be better to send one LQM packet and know that loss is > 5% rather than have to send 100 hello packets in addition to the 100 > data packets to reliably know that loss is 5%. (In MPLS it could be a > billion packets between LM packets). > > LQM does not rely on a count of probe packet success. Please reread > what I sent earlier or read about PPP LQM or MPLS-TP LM OAM. > > Please compare RFC 6130 section 14.2 (Basic Principles of Link > Quality) "Link quality" and "Link metric" are two different kind of things for NHDP/OLSRv2. Link quality is used for a hysteresis mechanism that can make a link symmetric/asymmetric. Link metric (as defined in RFC 7181) is used for path selection. > with RFC 1989 and RFC 6375. In RFC 6375 look at Section 2.2 > (Packet Loss Measurement) and Section 3.1 (Loss Measurement Message > Format). RFC 6130 has no comparable mechanism. RFC6130 (NHDP) and RFC 7181 (OLSRv2) define the incoming link METRIC calculation as an external process. It can be anything, as long as it gives you a dimensional link cost in the right range. I admit the splitup between RFC6130 and RFC7181 is a bit confusing... Henning Rogge _______________________________________________ homenet mailing list [email protected] https://www.ietf.org/mailman/listinfo/homenet
