> Thanks for your quick response. I think you solved my mixed case issue.
>
> I'd still like to understand the ICMP message situation better. I realize
> that the traffic is supposed to be unidirectional, but how would, say,
> lower MTU somewhere along the path be dealt with? I'm not necessarily
> asking for a change in what the spec does, but it should be clear about the
> consequences.
Under normal circumstances, the only thing that should be send across the
ALT would be a Map Request, which should not cause MTU problems. Of course,
if a (deprecated) Data Probe were used, then all bets are off.
If a Map Request or Data Probe were to hit an MTU problem or otherwise be
undeliverable across the ALT and no ICMP message could be returned from the
ALT node where the failure occurred to the Map Request originator, then
the originator would retry sending the Map Request several times before
timing-out. If such a timeout occurred, then the destination would be
considered not LISP-capable and LISP encapsulation would not be done
toward it.
--Vince
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