On Oct 11, 2011, at 10:27 AM, Michael Richardson wrote: > >>>>>> "Fred" == Fred Baker <[email protected]> writes: > Fred> On Oct 11, 2011, at 12:05 AM, Jari Arkko wrote: > >>> That being said, if the home routers have to discover their IPv6 >>> prefix through a protocol and store it in flash, they could >>> probably do so also for a router ID. Unless there was some >>> chicken and egg problem that required the router ID for all this >>> discovery to work... > > Fred> (z)ospf requires the router to have a router id in order to > Fred> join the network, which it has to do before it can receive the > Fred> LSAs from other routers in the area to inspect their subnet > Fred> prefixes. So making the router id dependent on the prefix > Fred> doesn't make a lot of sense to me. > > Fred> While a MAC Address is not guaranteed to be globally unique, > Fred> it is intended to be; places where duplicates have been seen > Fred> tend to be manufacturing errors. From that perspective, > Fred> grabbing the least significant 32 bits from a MAC address as a > Fred> first guess seems reasonable. What one would then need to do > Fred> is > > What do we do in that rare case where the bottom 32 of the MAC are > duplicated?
The conflict must be resolved with one router selecting a different Router-ID. That is a problem that would need to be handled in any OSPFv3 auto-configuration draft. You cannot have two routers in the same routing domain with the same OSPFv3 Router ID since their LSAs cannot be differentiated from one another and the two routers with the same Router-ID will get into a flooding war. Thanks, Acee > > Also consider that virtual switches (VMware, XEN, etc.) all pretty much > use the same set of MAC addresses. VMware has a 50: prefix that they > use, XEN has another, and did you know that 10:00:00 (curisously like > 10/8) is reserved for private use... > > So, it would be good for zospf text to say something about this. > I think that we can use 32-bits of MAC address in most cases. > > Fred> One obviously doesn't actually announce any LSAs using the > Fred> router ID until a unique router id is established. > > okay. > > -- > ] He who is tired of Weird Al is tired of life! | firewalls > [ > ] Michael Richardson, Sandelman Software Works, Ottawa, ON |net > architect[ > ] [email protected] http://www.sandelman.ottawa.on.ca/ |device > driver[ > Kyoto Plus: watch the video <http://www.youtube.com/watch?v=kzx1ycLXQSE> > then sign the petition. > <ATT00001>_______________________________________________ > homenet mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/homenet
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