[Idr] Comments on draft-zhang-idr-sr-policy-template

[Nat Kao <[e-mail]>]

Hi, Ka.

I believe this draft provides a handy extension to the SR-Policy SAFI.
It would be nice if we can clarify some details of the procedure.

Consider the following case on headend H1:

CP1<E1, C1>:
    <BSID=2000,
     SL(Weight=W1):<S1, S2, S3>,
     SL(Weight=W2):<S4, S5, S6>,
     TemplateID=100>

Template 100:
    <BSID=4000,
     PolicyCandidatePathName="Template4k"
     SL(Weight=W11):<S11, S12, S13>,
     SL(Weight=W21):<S24, S25, S26>,
     ENLP=4>

- When CP1 is received by H1 over BGP, what exact characteristics would CP1
have?
 * For Sub-TLV types that appear at most once(BSID, ENLP, ...),
    would the value specified in CP1 override the value specified in
Template 100?
   More precisely, which BSID would CP1 have? 4000 or 2000?
 * For Sub-TLV types that can appear multiple times(SL, ...), do we merge
them?
   More precisely, what SLs would CP1 have?
 * I guess the CP1 validation process occurs after referring to Template
100. Am I correct?

- It's worth mentioning how to deal with the CP when the template changes.
  For example, when:
    * The template is added after receiving the CP.
    * The template is removed.
    * The template is modified.

Thanks,
Nat