Routing and signaling across devices with different switching cap abilities

["Pandian, Vijay" <Vijay.Pandian@sycamorenet.com>]

Consider a mix of devices with varying switching capabilities connected as
follows:

     PSC-1 <===> TDM-1 <===> LSC-1 <===> FSC <===> LSC-2 <===> TDM-2 <===>
PSC-2

Is it fair to assume that PSC-1 and PSC-2 would advertise TE-LSA's with
"PSC" as the switching capability, TDM-1 and TDM-2 would advertise TE-LSA's
with "TDM" as the switching capability, LSC-1 and LSC-2 would advertise
TE-LSA's with "LSC" as the switching capability...?

Given this, would the PSC device (say PSC-1) be able to compute a path using
CSPF to PSC-2?

There had been some discussion regarding the type of label (SUKLM vs. lambda
vs. port) to be used across these switching capabilities. How about the
"LSP-Enc. Type", and "Switching Type" in the Generalized Label Request
Object? How about the Bandwidth Encoding in the SENDER_TSPEC and FLOWSPEC
object?

According to rfc3471, section 3.1.1, the switching type is expected to map
to one of the values advertised for the corresponding link. In that case,
would the LSC-device accept a Generalized Label Request with TDM switching
capability and "port" as the label coming from the TDM capable device?

Any clarification on this is appreciated...

Thanks,

Vijay

PS: During various GMPLS interop events, an additional FSC (and LSC?)
switching capability in the TE-LSA's was required for the end devices to
compute path.