Re: [mpls] Mirja Kühlewind's No Objection on draft-ietf-mpls-residence-time-14: (with COMMENT)
Greg Mirsky <gregimirsky@gmail.com> Tue, 07 March 2017 17:29 UTC
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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Tue, 07 Mar 2017 09:29:42 -0800
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To: Mirja Kühlewind <ietf@kuehlewind.net>
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Subject: Re: [mpls] Mirja Kühlewind's No Objection on draft-ietf-mpls-residence-time-14: (with COMMENT)
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Hi Mirja, et. al, I've uploaded the update to the draft. We've done our best to address your many comments. Kind regards, Greg On Tue, Mar 7, 2017 at 5:26 AM, Mirja Kühlewind <ietf@kuehlewind.net> wrote: > Still not convinced because you can just use an new RTM TLV for this case. > > On 06.03.2017 23:58, Greg Mirsky wrote: > >> Hi Mirja, >> we use sub-TLV in Figure 2 as future proofing approach in case someone may >> need to define different sub-TLV that MUST precede the PTP packet. >> Would you agree that it is reasonable design choice? >> >> Regards, >> Greg >> >> On Fri, Mar 3, 2017 at 11:19 AM, Mirja Kuehlewind (IETF) < >> ietf@kuehlewind.net >> <mailto:ietf@kuehlewind.net>> wrote: >> >> Hi Greg, >> >> two quick replies below. >> >> Mirja >> >> > Am 03.03.2017 um 20:10 schrieb Greg Mirsky <gregimirsky@gmail.com >> <mailto:gregimirsky@gmail.com>>: >> > >> > Hi Mirja, >> > thank you for your comments and very helpful discussion. My notes >> in-lined and now tagged with GIM2>> >> > >> > Regards, >> > Greg >> > >> > On Fri, Mar 3, 2017 at 1:46 AM, Mirja Kuehlewind (IETF) >> <ietf@kuehlewind.net <mailto:ietf@kuehlewind.net>> wrote: >> > Hi Greg, >> > >> > see inline. >> > >> > Mirja >> > >> > >> > > Am 03.03.2017 um 03:47 schrieb Greg Mirsky <gregimirsky@gmail.com >> <mailto:gregimirsky@gmail.com>>: >> > > >> > > Hi Mirja, >> > > thank your for the review and the comments, most helpful. >> > > Please find my answers in-line tagged GIM>>. >> > > >> > > Regards, >> > > Greg >> > > >> > > On Wed, Mar 1, 2017 at 8:48 AM, Mirja Kühlewind < >> ietf@kuehlewind.net >> <mailto:ietf@kuehlewind.net>> wrote: >> > > Mirja Kühlewind has entered the following ballot position for >> > > draft-ietf-mpls-residence-time-14: No Objection >> > > >> > > When responding, please keep the subject line intact and reply to >> all >> > > email addresses included in the To and CC lines. (Feel free to >> cut this >> > > introductory paragraph, however.) >> > > >> > > >> > > Please refer to >> https://www.ietf.org/iesg/statement/discuss-criteria.html >> <https://www.ietf.org/iesg/statement/discuss-criteria.html> >> > > for more information about IESG DISCUSS and COMMENT positions. >> > > >> > > >> > > The document, along with other ballot positions, can be found >> here: >> > > https://datatracker.ietf.org/doc/draft-ietf-mpls-residence-time/ >> <https://datatracker.ietf.org/doc/draft-ietf-mpls-residence-time/> >> > > >> > > >> > > >> > > ------------------------------------------------------------ >> ---------- >> > > COMMENT: >> > > ------------------------------------------------------------ >> ---------- >> > > >> > > High level comment: >> > > Maybe extend the security section a bit and describe what can >> happen in >> > > the worse case if the value has been modified to a too high or >> too low >> > > value; and maybe even given some guidance on performing >> additional checks >> > > to figure out if a given value is reasonable for a given path or >> not. >> > > >> > > Questions: >> > > - Can you explain why PTPType, Port ID, and Sequence ID are >> needed in the >> > > PTP Sub-TLV format if those values are already in the PTP packet >> itself >> > > that follows? >> > > GIM>> We propose to copy these values as they uniquely identify >> PTP >> control message as these are required for two-step mode and suggesting >> inspection of the PTP payload would cause layer violation. >> > >> > I see. Maybe add a sentence that these field are use to identify the >> packet. However, when you copy them, you also have to inspect the >> payload >> and that’s the same layer violation. Also not sure if duplicating >> information in the packet is the best approach. Why don’t use just >> add an >> own identifier to the packet instead? >> > GIM2>> Will the following, when added at the very end of Section >> 3.1, work: >> > Tuple of PTPType, Port ID, and Sequence ID uniquely identifies >> PTP >> > control packet encapsulated in RTM message and are used in >> two-step >> > RTM mode Section 2.1.1. >> > >> > GIM2>> The RTM message created by egress or the first on the LSP >> two-step RTM node. Thus other RTM nodes don't need to look into PTP >> control message but use the PTP sub-TLV. Creating new identifier is >> certainly an alternative but I believe that will require more state >> coordination between LERs on the same RTM LSP. Re-using existing >> characteristic information, in my view, is simpler solution. >> >> Yes the new text helps. I don’t see why there is any more coordination >> needed if you use an identifier. If you are in two-step mode, you >> simply >> remember the identifier of the packet that you use to measurement >> together with your measurement and wait for the next packet with the >> same >> identifier. I don’t think that’s any different than using the PTP >> information as identifier. Anyway that’s not an big issue. >> >> > >> > > >> > > - Why is it necessary to define PTP sub-TLV (and have a registry >> for one >> > > value only)? Are you expecting to see more values here? What >> would those >> > > values be? >> > > GIM>> We may have another protocols or applications to use RTM >> and these the most likely will have their specific set of parameters to >> uniquely identify control session for two-step mode. One obvious case would >> be NTP when on-path support is defined. But since we don't know which >> parameters will uniquely identify cotrol session we don't request code >> point allocation. >> > >> > My understanding was that a new protocol would be a different RTM >> TLV in the registry in section 7.2. That’s fine. I don’t understand why >> your PTP sub-TLV needs ANOTHER TLV scheme: figure 2 and registry in sec 7.3. >> > GIM2>> RTM TLV differentiates between different encapsulation >> types, e.g. Ethernet, IPv4 or IPv6 but sub-TLV doesn't have to. Do you see >> this as a problem? >> >> I still don’t fully understand this. You can use the same sub-TLV >> even if >> that sub-TLV is not extensible. All I’m saying is that I don’t >> understand >> why the sub-TLV in figure 2 has again a type and a value. I don’t >> think >> those two field are needed. >> >> > >> > > - Similar to Spencer's question: Why don't you also define a >> Sub-TLV >> > > format for NTP? >> > > GIM>>Hope that above answer addresses this question. >> > >> > Actually not really. Why don’t you know which parameters to use? >> > >> > > - sec 4.3: "RTM (capability) - is a three-bit long bit-map field >> with >> > > values >> > > defined as follows: >> > > * 0b001..." >> > > Maybe I don't understand what a bit-map field is here but these >> are >> > > more then 3 bits...? >> > > GIM>> '0b' identifies binary format as '0x' identifies hexadecimal >> format of notation. >> > Ah sorry, fully overview that. >> > >> > > - also sec 4.3.: "Value contains variable number of bit-map >> fields so >> > > that overall >> > > number of bits in the fields equals Length * 8." >> > > However there is no field 'Value' in the figure... >> > > GIM>> Thank you for pointing. I'll update Figure 4 and Figure 5 to >> add Value tag on the field immediately following RTM field. >> > >> > There are more questions here: >> > >> > > Also the following >> > > explanation about future bit-maps is really confusing to me; why >> don't >> > > you just say that the rest as indicated by the length field must >> be >> > > padded with zeros...? >> > GIM2>> The description follows RFC 7794 Section 2.1 >> > > - Should section 4.8 maybe be a subsection of 4.7? This part >> confused me >> > > a bit because the example seems to be generic but the rest is >> RSVP-TE >> > > specific, right? Maybe move the example as a separate section >> before or >> > > after the whole section 4...? >> > GIM2>> Thank you, I agree it is more logical flow. With the change >> suggested by Ben it will look like this: >> > 4. Control Plane Theory of Operation . . . . . . . . . . . . . >> . 10 >> > 4.1. RTM Capability . . . . . . . . . . . . . . . . . . . . >> . 10 >> > 4.2. RTM Capability Sub-TLV . . . . . . . . . . . . . . . . >> . 11 >> > 4.3. RTM Capability Advertisement in Routing Protocols . . . >> . 11 >> > 4.3.1. RTM Capability Advertisement in OSPFv2 . . . . . . >> . 11 >> > 4.3.2. RTM Capability Advertisement in OSPFv3 . . . . . . >> . 13 >> > 4.3.3. RTM Capability Advertisement in IS-IS . . . . . . . >> . 13 >> > 4.3.4. RTM Capability Advertisement in BGP-LS . . . . . . >> . 13 >> > 4.4. RSVP-TE Control Plane Operation to Support RTM . . . . >> . 14 >> > 4.4.1. RTM_SET TLV . . . . . . . . . . . . . . . . . . . . >> . 15 >> > >> > > >> > > Nits: >> > > - Maybe change to title to: Residence Time Measurement (RTM) in >> MPLS >> > > network >> > > - There are (still) some not spelled out abbreviations (LDP, PW); >> > > GIM>> Since both are used only once - expanded >> > > in turn >> > > others are extended twice (e.g. PTP)... >> > > GIM>> Cleaned. >> > > - In figure 1, I would rename 'Value' to 'Sub-TLV' and maybe also >> > > indicate it as optional in the figure: Sub-TLV (optional) >> > > GIM>> Agree >> > > >> > >> > >> >> >>
- [mpls] Mirja Kühlewind's No Objection on draft-ie… Mirja Kühlewind
- Re: [mpls] Mirja Kühlewind's No Objection on draf… Greg Mirsky
- Re: [mpls] Mirja Kühlewind's No Objection on draf… Mirja Kuehlewind (IETF)
- Re: [mpls] Mirja Kühlewind's No Objection on draf… Greg Mirsky
- Re: [mpls] Mirja Kühlewind's No Objection on draf… Mirja Kuehlewind (IETF)
- Re: [mpls] Mirja Kühlewind's No Objection on draf… Greg Mirsky
- Re: [mpls] Mirja Kühlewind's No Objection on draf… Mirja Kühlewind
- Re: [mpls] Mirja Kühlewind's No Objection on draf… Greg Mirsky