>>>>> "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?
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[
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