Stream Schedulers and User Message Interleaving for the Stream Control Transmission Protocol
draft-ietf-tsvwg-sctp-ndata-13

I wish this had been around back when we were figuring out how to share connections in MSRP.

Otherwise, just a couple of editorial comments:

- Abstract: "Multiple ways for performing
   this selection, called stream schedulers, are defined. "
I assume you mean that they are defined in this document rather than in previously existing documents, but it seems ambiguous.

- 2.1: "The sender uses two counters for
      each outgoing stream, one for ordered messages, one for unordered
      messages.  All counters are independent and initially 0."

s/ all / both  ; unless this rule is intended to apply to more counters than the ones mentioned in the previous sentence.

Mostly editorial comments:
1) Why, after all, is SSN renamed to MID? I understand that the MID was extended to 32 bit and that the name might be more appropriate but I still find it confusing given both fields have the same semantics. Maybe it would help to point this out more explicitly in the document.

2) It could be helpful for the reader to also name the I and the U bits in section 2.1; especially the U bit could be referenced when MID is explained.

3) Should there maybe be a recommendation that re-assotiating without interleaving support could be tried if a ABORT message is received. I guess that failure case could occur if the negation was altered in the network and one end thinks it support interleaving but the other not...?

4) Related to my first point: I guess you only need a new I-FORWARD-TSN chunk because you use MID instead of SSN. This seem to me that you just took the opportunity to make this change with this extension but then it should maybe be the spell out as a 'separate' change/improvement in the intro.

5) Really a nit but hard to read otherwise; you really need to use a comma here (sec 1.1):
OLD
"If I-DATA support has been negotiated for an association
   I-DATA chunks are used for all user-messages."
NEW
"If I-DATA support has been negotiated for an association,
   I-DATA chunks are used for all user-messages.“