> > Hi, > > On Thu, Aug 27, 2009 at 10:00:35AM -0700, Michael K. Smith - Adhost > wrote: > > ipv6 address <v6 address>::1/64 anycast > > That's cool. How exactly does it work?
I haven't been able to find anything specifically on Cisco's website about how it really works. Even the tech docs just say it has to do with geographic locale - the closer one wins. I'm not sure how the devices (in this case, FreeBSD boxes running PF) know which is closer, but they do. :-) > > I assume that the "anycast" suffix will suppress DAD, and then the > client will use whichever router answers first on the ND request for > ::1, and when NUD strikes, the next ND will get the other router? > I read through RFC2373 and it doesn't detail how it works either - it just specifies what you can and cannot do. The main point is that anycast only works on routers, not hosts. I can tell you that the router shows that DAD is *not* enabled on either interface. But, this is interesting. When I ping the ::1 address from one of the PF boxes, the neighbor entry changes from "state" to "reach" which seems to indicate that the "reach" router is being seen as geographically closer. Mike _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
