Dino,
> of "magic" all the problems that motivated development of CEF would
> disappear in the context of ITR/ETR caches ? And if they would not
You don't do packet-time population of the cache like CEF did. In
LISP, you do packet-time Map-Requests, but the Replies populate the
cache at control-plane time. That is the difference, subtle but
important.
But the subtle difference also is that before the reply for such request
is received you have two choices:
* drop packets /* not saying this is bad .. just static the facts when
comparing to today's FIB approach */
or
* forward it to practically non existent and managed by unknown entity
virtual GRE based LISP-ALT topology ...
I like APT proposal much more robust in that respect enforcing that all
ISPs have a default mapper and locally packets undergo just two stage
tunneling process if topologically required.
Cheers,
R.
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