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Hi Greg,

 

Many thanks for your review comments and suggestions= .

Please see replies inline with <RG>=A1=AD=

 

From: spring <spring-bounces@ietf.org&g= t; on behalf of gregory.mirsky@ztetx.com <gregory.mirsky@ztetx.com> Date: Friday, June 11, 2021 at 3:19 AM
To: jguichar@futurewei.com <jguichar@futurewei.com>
Cc: spring@ietf.org <spring@ietf.org>, spring-chairs@ietf.org = <spring-chairs@ietf.org>
Subject: Re: [spring] WG Adoption Call for https://www.ietf.org/arch= ive/id/draft-gandhi-spring-stamp-srpm-06.txt

Dear Authors, et al.,
I've read the draft. Thank you for your thoughtful consideration of comment= s from earlier discussions. The document is well-written and I agree with i= t being on the Informational track.

<RG> Many thanks.

 

I've several questions and much appreciate it if you= help me to understand.
In the example of a STAMP test packet (Figure 2) the text suggests that IPv= 4 addresses can be used as the source and destination. In which case you se= e IPv4 address family should be used in the SR environment?

 

<RG> Figure 2 shows both IPv4 and IPv6 address= family and they are the addresses of the Session-Sender and Session-Reflec= tor as defined in STAMP.  The STAMP packet is further encapsulated wit= h an SR-MPLS/SRv6 header depending on SR-MPLS Policy or SRv6 Policy being measured.


I suggest changing the reference in Figure 2 from Section 4.2 of RFC 8762 t= o Section 3 of RFC 8972 (Figure 1). Thus the STAMP Session Identifier will = be supported in SR environments and implementations can use the value of th= e field to simplify demultiplexing STAMP test sessions.

 

<RG> Thanks for the suggestion, agree to updat= e it in the next revision.

 


I couldn't understand the last sentence in Section 4.1.1:
   An IPv4 address from the range 127/8 or IPv6
   loopback address ::1/128 [RFC4291] must not be used to IP rout= e test
   packets in a network.
How this requirement (if that is the requirement, then s/must not/MUST NOT/= might be needed), is related to RFC 1801 that states that:
      A router SHOULD NOT forward, except over a l= oopback interface, any
      packet that has a destination address on net= work 127.

 

<RG> Agree to remove this sentence in the next= revision.


Also, it appears that only IP encapsulation is explained in Section 4.1.1. = Since the draft includes in its scope both SRv6 and SR-MPLS, I wonder in wh= at case IPv4 addressing will be used? It seems that rather than including I= Pv4, the section should document the encapsulation of a STAMP test packet over an MPLS link.

 

<RG> It is not necessary to add SR encapsulate= for sending test packets for links.

<RG> However, we could add text to state =

=A1=B0SR encapsulation (e.g. adjacency SID of the link) can be added for tr= ansmitting the test packets for links.=A1=B1


Section 4.1.2 also refers to IPv4 address family being used by a Session-Se= nder and SR Policy. What could be the use case for IPv4 in SR?

 

<RG> As mentioned above, RFC 8762 base STAMP p= ackets carry IP/UDP header. The IP address family in the base STAMP test pa= cket can be IPv4 or IPv6 address of the Session-Sender and Session-Reflecto= r. In SR, the STAMP packets are further encapsulated with an SR header.

 

What is the benefit of using the inner IP Header as = presented in Figure 4?

 

<RG> The inner IP header is useful in loopback= mode, the outer header is responsible for transmitting the test packet to = the Session-Reflector. The Session-Reflector will decap SRv6 tunnel header = and forward the test packet back to the Session-Sender according to the inner header.

<RG> We can update this in the next revision.<= o:p>


As for Figure 2, I propose changing the reference to Section 3 of RFC 8792 = (Figure 2).

<RG> We are ok to update it in the next revision.


As for Figure 4, I have a question about the inner IP header in Figure 7.

 

<RG> It is not necessary. We can update in the= next revision.


Can you point to the definition (or provide it) of the loopback mode?<= /o:p>

 

<RG> In this (informational) draft, it is defined for SR network=
s in Section 4.2.3.


The second paragraph of Section 4.2.3 suggests that the Session-Sender is e= xpected to receive a self-addressed STAMP test packet. Can you point out th= e text in RFC 8762 that defines the base STAMP functionality on which this = model is based?

 

<RG> In this (informational) draft, it is defined for SR network=
s in Section 4.2.3.

 


In the same paragraph, the draft states:
   The Session-Sender sets the Reflector UDP port that it uses to= receive the test packet.
Can you clarify the definition of the Reflector UDP port?

 

<RG> It is destination UDP port in the Session= -Sender test packet. We are ok to update in the next revision.


The third paragraph, as I understand it, assumes that the Session-Sender do= es not use some fields to calculate performance metrics. I couldn't find su= ch a mode is described in RFC 8762. Does this draft propose changes to the = RFC 8762?

 

<RG> This informational draft explains various= delay metrics in SR. It does not change RFC 8762.

 


I've got confused by the rules listed for setting TTL in Section 4.4.1. For= example, according to the rule in the third paragraph, TTL must be set to = 1 for the STAMP measurement over a link. But that seems like the opposite t= o what is required in RFC 5082 The Generalized TTL Security Mechanism (GTSM). I hope you can share why TTL mu= st be set to 1 in this case.

 

<RG> As described in Section 4.3 of [RFC8029],= for IP address 127/8 case with using TTL=3D1, it is to ensure that the tes= t packet does not get incorrectly IP routed to more than one IP hop and pro= vide incorrect measurement.


The same question for the use case described in the second paragraph.<= /o:p>

 

<RG> Please see above.


Two previous questions are also applicable to Section 4.4.2.

 

<RG> Please see above.

 


Section 5, as I understand it, suggests that all modes of operation describ= ed in Section 4 can be used to measure packet loss. At the same time, in Se= ction 4.2.3. Loopback Measurement Mode is noted (or required) that the Sess= ion-Sender sets the value of the Session-Sender Sequence Number field to zero. If that is the case, how the= packet loss is calculated in the loopback mode?

 

<RG> Session-Sender has the knowledge about th= is mode. Session-Sender can set the Session-Sender Sequence Number to Seque= nce Number to avoid any confusion. We are ok to update it in the next revis= ion.

 


Also, Section 5 provides a very intriguing statement:
   This method can be used for inferred packet loss measurement,<= br>    however, it does not provide accurate data packet loss metric.=
Do you have more information, perhaps a reference to a study or RFC, to sup= port this statement? Following the logic of that statement, if packet loss = measured using STAMP is not accurate, wouldn't measured packet delay also b= e not accurate? It seems that, if authors want to maintain this position, the definition of the accuracy of = the measurement must be introduced.

 

<RG> RFC 6374 has good discussions on the two = loss measurement modes. We are ok to update the text as follows to align wi= th RFC 6374.

 

   This method can be used for inf= erred packet loss measurement,
   however, it provides only approximate view of the data packet = loss.


I feel that the suggestion to variate IPv4 address in measuring performance= metrics in the SR-MPLS environment is somewhat outdated and is not in step= with RFCs 6790 and 8662. Why choosing addresses from the 127/8 range is pr= eferred to using the Entropy label which is more likely to be used on the data traffic?

 

<RG> Yes, we can add following text in the nex= t update:

 

=    Forwarding plane has various hashing functions available to fo= rward

=    packets on specific ECMP paths.  For SR-MPLS Policy, swee= ping of

=    entropy label [RFC6790] values can be used in Session-Sender t= est packets

=    and Session-Reflector test packets

=    to take advantage of the hashing function in forwarding=

=    plane to influence the ECMP path taken by them.

 


I have another question on the last sentence of Section 8:
   The STAMP Session-Reflector must not transmit reply test packe= t if it is
   not the intended destination node in the "Destination Nod= e Address"
   TLV [I-D.gandhi-ippm-stamp-srpm].
How does this requirement work in the case of a P2MP SR policy? And which a= ddress would be used in the Destination Node Address TLV in that case?=

 


<RG> As specified in [draft-ietf-ippm-stamp-srpm-00], the Destination Node Address TLV is applicable to P2P SR Policy.

We can add the sentence in this draft as well in the= next update.

 

Thanks,

Rakesh

 



I believe that while some questions are non-blocking and can be addressed a= t a later time, there is a significant number of technical substantive issu= es that must be resolved before the adoption of this draft.

 


I am looking forward to the Authors' feedback.

Regards,
Greg Mirsky
Sr. Standardization Expert
=D4=A4=D1=D0=B1=EA=D7=BC=B2=BF/=D3=D0=CF=DF=D1=D0=BE=BF=D4=BA/=D3= =D0=CF=DF=B2=FA=C6=B7=BE=AD=D3=AA=B2=BF  Standard Preresearch Dept./Wireline Product R&D Institute/Wireline Pro= duct Operation Division
E: gregory.mirsky@ztetx.com
www.zte.com.cn
------------------Original Mail------------------
Sender: JamesGuichard
To: spring@ietf.org;
CC: spring-chairs@ietf.org;
Date: 2021/06/07 05:34
Subject: [spring] WG Adoption Call for https://www.ietf.org/archive/id/draft-gandhi-spring-stamp-srpm-06.txt _______________________________________________
spring mailing list
spring@ietf.org
https://www.ietf.o= rg/mailman/listinfo/spring

Dear WG:
The IPPM WG has adopted https://datatracker.ietf.org/doc/html/draft-ietf-ippm-stamp-srpm-00&nbs= p; as a WG document. In a previous communication (December 16th 2020), the = SPRING chairs decided not to adopt https://www.ietf.org/archive/id/draft-gandhi-spring-stamp-srpm-06.tx= t into the WG until its companion document was accepted by the IPPM WG.= This has now happened and  therefore we feel it is now time to revisit the WG adoption of the SPRING document.<= br> Due to the lapse of several months since the initial WG adoption call, the = chairs would like to start another 2-week WG adoption call for https://www.ietf.org/archive/id/draft-gandhi-spring-stamp-srpm-06.tx= t, ending June 21st 2021.
After review of the SPRING document please indicate support (or not) for WG= adoption to the mailing list. Please also provide comments/reasons for tha= t support (or lack thereof) as silence will not be considered as consent. Thanks!
Jim, Joel & Bruno

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