Clarification needed re: IF Index TLV in RSVP_HOP

["Michael I Mandelberg(Isaac)" <mmandelberg@fwion.com>]

In draft-ietf-mpls-generalized-signaling-09, page 25 it says:


   In cases where there is not an explicit one-to-one association of
   control channels to data channels it is necessary to convey
   additional information in signaling to identify the particular data
   channel being controlled.  GMPLS supports explicit data channel
   identification by providing interface identification information.
   GMPLS allows the use of a number of interface identification schemes
   including IPv4 or IPv6 addresses, interface indexes (see [MPLS-
   UNNUM]) and component interfaces (established via configuration or a
   protocol such as [LMP]).  ***In all cases the choice of the data
   interface is indicated by the upstream node using addresses and
   identifiers used by the upstream node.***

The final sentence is clear enough for the Path message. The RSVP_HOP object
will specify the router ID and local link identifier according to the LSR
generating the Path message. It is not clear what is intended in the Reserve
message. I am guessing it is again the router ID and local link identifier,
but this time according to the generator of the Reserve message. However, I
can imagine other alternatives. Can someone in the know help out?

Thanks

> Michael Mandelberg
> FirstWave Intelligent Optical Networks, Inc.
> 11800 Sunrise Valley Drive, 15th floor
> Reston, Virginia 20191
> (703) 390 - 9401, x 1008
> mmandelberg@fwion.com
> 
>