> I would take Florin¹s point one step further: IID has become a critical
> part of an EID, as also obvious from the DDT draft. Even today, when there
> is no IID LCAF on wire, we are assuming an IID exists, and the value is 0.
> An alternative is to just consider adding it as part of the EID record (in
> LISP messages), instead of having it as an LCAF.
Well the EID-record in a Map-Request looks like this:
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ | Reserved | EID mask-len | EID-Prefix-AFI |
Rec +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
\ | EID-Prefix ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
And a EID-record in a Map-Reply, Map-Register, and Map-Notify looks like this:
+-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| | Record TTL |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
R | Locator Count | EID mask-len | ACT |A| Reserved |
e +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
c | Rsvd | Map-Version Number | EID-Prefix-AFI |
o +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
r | EID-Prefix |
d +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| /| Priority | Weight | M Priority | M Weight |
| L +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| o | Unused Flags |L|p|R| Loc-AFI |
| c +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| \| Locator |
+-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
So finding 24-bits in reserved fields is not only costly, not available and
doesn’t allow future single bit allocations, not to mention the huge complex
compatibility problem we would have, I wouldn’t suggest going this route.
So one should ask, for an EID lookup, or a lookup key, what else would you want
to accompany the EID with? If it is going to be a multi-tuple lookup, you are
going to need an AFI-List Type encoding anyways. But for the typical lookup of
(<iid>, <eid>) and (<iid, <seid>, <group-eid>) the Instance-ID
Type works for the former and the Multicast-Info Type works for the later.
So I would like to hear why you would use a nested LCAF for an (<iid>, <eid>)
lookup?
Dino
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