[rbridge] Max Network size

[Joe Touch]

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Alper Yegin wrote:
>>only when you don't have config info. If you move ethernets within an
>>enterprise (i.e., within a campus deployment), you don't necessarily
>>contact DHCP when you move.
> 
> 
> Even than the host needs to perform some tests to know it is still
> connected to the same IP subnet. Like the reachability test outlined in
> http://ietf.org/internet-drafts/draft-ietf-dhc-dna-ipv4-11.txt . The
> test is using ARP....

It CAN use that test, but doesn't have to. There are devices that don't
bother to say anything until they have something to say, rather than
just when an interface regains signal...

(which is why the DHC draft above isn't a requirement, but an optimization).

>>Sure. But this is, in a lot of ways, just another version of an
>>optimization. We definitely need to cover the case where the
>>optimization isn't in place anyway...
> 
> 
> I agree.....
> 
> Let's not rely on presence of optimizations. Nevertheless let's
> enumerate them, so that people don't think they are always stuck with
> the worst case scenario.

I'm not arguing against discussing optimizations at all; just that we
need to implement the base case regardless. And to make sure the
optimizations don't come with any downside (i.e., when they fail, they
shouldn't interfere with what would have happened were they not there).

Joe
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