Re: Call for consensu on admission priority changes in QSPEC

WG chair hat off, I support 3.

John 

>-----Original Message-----
>From: [email protected] [mailto:[email protected]] On 
>Behalf Of ext Martin Stiemerling
>Sent: 13 March, 2008 17:42
>To: nsis
>Subject: [NSIS] Call for consensu on admission priority 
>changes in QSPEC
>
>Hi all,
>
>There have been discussions with respect to QoS NSLP QSPEC 
>Template (draft-ietf-nsis-qspec-19.txt) on the nsis mailing 
>list, offline between involved parties, and also during the 
>NSIS session here at the IETF#71 in the NSIS session (see minutes).
>
>The QSPEC document shares the IANA registries for RPH priority 
>and the admission priority with these drafts out of the DIME and TSVWG:
>- draft-ietf-dime-qos- parameters
>- draft-ietf-tsvwg-emergency-rsvp
>
>While the IANA registry for the RPH priority has not been 
>disputed, the admission priority has been. 
>
>Therefore we run a call for consensus on these three choices 
>for the admission priority in the QSPEC. Note well, that the 
>decision of this can have an impact to the still running IETF 
>last call for draft-ietf-tsvwg-emergency-rsvp.
>
>
>
>Please hum on the NSIS list for one of the three options 
>listed below until Monday, March 17th, 12pm UCT. This is to 
>confirm the humming of the NSIS WG during the NSIS session at 
>the IETF meeting.
>
>1) Keep Y.2171 admission prioty in draft-ietf-nsis-qspec-19.txt as is:
>
>2) Change in draft-ietf-nsis-qspec-19.txt to admission 
>priority as in draft-ietf-tsvwg-emergency-rsvp-05.txt and 
>remove Y.2171 admission prioty;
>
>3) Keep Y.2171 admission priority and add admission priority 
>as in tsvwg-rsvp-emergency to draft-ietf-nsis-qspec-19.txt. 
>
>
>
>
>For choice 3) these changes are currenlty proposed:
>
>1) the emergency-RSVP draft should pretty much stay the same.  
>There is no "L" bit addition, and its "Admission Priority" 
>field has local significance within a domain, and no 
>pre-existing values are defined for it, nor is there any 
>associated IANA registry assigned to it.
>
>2) The QSPEC draft will have a similar "Admission Priority" 
>field with the same characteristics as that defined above in (1).
>
>3) The QSPEC draft will add a new field, titled "Y.2171 
>Admission Priority", that will be associated with the current 
>3 values defined in the Y.2171. This field is considered 
>globally significant on an end- to-end basis.  Note that the 
>emergency-RSVP document will NOT have this additional field.
>
>4) Given the presence of two admin priority fields for the 
>QSPEC, additional rules are added to clarify their application 
>and usage for NSIS domains.
>
>4.1)  if the source domain does NOT support Y.2171, then it 
>sets a locally significant value in the "Admission Priority" 
>field, and places all "1"s in the "Y.2171 Admission Priority" 
>to indicate that this field is to be ignored.  Downstream 
>domains MUST NOT alter the value of the "Y.2171 Admission 
>Priority"  field.
>
>4.2)  if the source domain DOES support Y.2171, then a value 
>(eg, 0, 1, or 2) is placed in the "Y.2171 Admission Priority" 
>field AND the "Admission Priority" field.  Downstream NSIS 
>domains MUST NOT change the value in the "Y.2171 Admission 
>Priority" field so that end-to-end consistency is maintained.  
>Downstream routers act upon the value placed in the "Admission 
>Priority" field.
>
>4.2.1)  Furthermore, if a downstream NSIS domain does not support Y. 
>2171, it MAY place a locally significant different value in 
>the "Admission Priority" field, which is used by downstream 
>routers within its domain.  Subsequent downstream domains that 
>do support Y.2171 make sure that the "Admission Priority" 
>field contains the same value as the "Y.2171 Admission Priority" field.
>
>
>Thanks,
>
>  Martin
>
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