Hi, I haven't had a chance to do a thorough read though, however I haven't been able to find where the following scenarios is dealt with.
In a pure energy efficient scenario, say there are two NEAR routers on the link (NEAR1, NEAR2). An EAH host (EAH1) at bootstrap chooses NEAR1, registers its addresses and uses NEAR1 as its egress router for off-link traffic. For the return traffic (i.e, off-link traffic coming onto the energy efficient segment), what occurs if the upstream network chooses to use NEAR2 to try to forward traffic to EAH1, as the upstream network considers NEAR2 rather than NEAR1 to be closer to EAH1 e.g, because of a smaller IGP metric, or the traffic source link is directly attached to NEAR2? In my understanding, NEAR2 wouldn't have knowledge of EAH1, because EAH1 has only been registered with NEAR1. So it would seem that currently the only choice is for NEAR2 to drop those packets. Further to this two or more NEAR scenario, even if the upstream network always considers NEAR1 to be the closer to the EAHs, if the NEARs are protected by a redundancy protocol such as VRRP, when VRRP switches from using NEAR1 to NEAR2, how does NEAR2 acquire address registration information? Would it be considered a EAH bootstrap event, so that all of the EAHs have to go through selection and then registration of a NEAR? While I think that would work, it would seem to be defeating the purpose of having a redundancy protocol like VRRP which tries to make switching over between routers nearly if not ideally transparent to downstream hosts. Regards, Mark. -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
