I'm forwarding the comments below (extracted, from a longer email from "Bernhard Collini-Nocker" <bnocker@cosy.sbg.ac.at>), since they relate to suggested changes to ULE, resulting from reading during the WGLC.
Gorry Fairhurst (ipdvb WG Chair) ----1. Figure 12 does not provide clear guidance on the placement of the NPA field when extension headers are present. The placement within the base-header needs to be clarified.
So, section 5. provides the following (more complex) example: < -------------------------- SNDU ------------------------- > +---+---------------------------------------------------+--------+ |D=1| Length | T1 | H1 | T2 | H2 | T3 | PDU | CRC-32 | +---+---------------------------------------------------+--------+ < ULE base header >< ext 1 >< ext 2 > Figure 12: SNDU Encapsulation with two Extension Headers
> Gorry:
I'd kind of assumed the NPA ALAWAYS was a part of the BASE HEADER, and that
it always is inserted after the first type field, with any extension headers
FOLLOWING the NPA when it is present. So, I guess I had imagined:
< -------------------------- SNDU ------------------------- >
+---+---------------------------------------------------+--------+
|D=0| Length | T1 | NPA | H1 | T2 | H2 | T3 | PDU | CRC-32 |
+---+---------------------------------------------------+--------+
<base header> <*1> < ext 1 >< ext 2 >
*1 NPA, if present, is always counted as a part of the base header.
> > Thoughts? ---- 2. In Section 4.7.5 Fig 8 The Bridge Frame SNDU Encapsulation - "Receiver Destination Address" should be marked as "NPA Address" ----