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loop; banned-address; member-moderation; header-match-spring.ietf.org-0; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Deterministic Networking Discussion List , "draft-ietf-spring-sr-redundancy-protection@ietf.org" X-Mailman-Version: 3.3.9rc6 Precedence: list Subject: =?utf-8?q?=5Bspring=5D_Re=3A_Few_more_comments_on_draft-ietf-spring-sr-redun?= =?utf-8?q?dancy-protection?= List-Id: "Source Packet Routing in NetworkinG (SPRING)" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: --_000_AM0PR07MB5938756D20424CA37531F67FAC372AM0PR07MB5938eurp_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Luis, Many thanks for the comments. - MTU: yes, redundancy protection increases the packet size. It is the same= as for other SRv6 tunnels. The size increase depends also on how many hops= between the redundancy nodes are defined. - End.R: right, the first redundancy node has some additional tasks to do. = The flow identification at the first redundancy node is done based on the r= eceived packet header fields, and the result is added in the form of a Flow= -ID to the ARG part of the End.R. Downstream redundancy nodes can identify = simple the flows based on the Flow-ID value. The SeqNum is added by the fir= st redundancy node and used by all the downstream redundancy nodes. The Seq= Num is added also to the ARG part of the End.R. In order to avoid confusion= the following change is proposed. OLD TEXT Encapsulates flow identification and sequence number in packets if the two information is not carried in packets. NEW TEXT Encapsulates flow identification and sequence number in SRv6 packets. END - SeqNum size: yes, this was discussed in DetNet and resulted in defining t= he 28 bit SeqNum format. Thanks & Cheers Bala'zs From: LUIS MIGUEL CONTRERAS MURILLO Sent: Friday, April 17, 2026 6:01 PM To: spring Cc: Deterministic Networking Discussion List ; draft-ietf-= spring-sr-redundancy-protection@ietf.org Subject: Few more comments on draft-ietf-spring-sr-redundancy-protection Dear all, Sharing few more comments related to draft-ietf-spring-sr-redundancy-protec= tion in SPRING but cc-ing DetNet because of the intersection of the redunda= ncy/PREF concept (that is, no ordering in this case). * It would be interesting to understand the potential impact on the MTU= due to the fact of activating the redundancy protection while traversing t= he network. This could be a limiting factor, or at least condition the appl= icability to the need of defining an MTU size in the domain for being able = to apply the solution. * In section 4.1, for End.R it is mentioned that "Encapsulates flow ide= ntification and sequence number in packets if the two information is not ca= rried in packets". But, how this is known? Adding some clarification could = help. * Sequence number size. I recall I raised this point during DetNet sess= ion in Madrid, and also commented in DetNet list (https://mailarchive.ietf.= org/arch/msg/detnet/KoMjM68ZGtZ6fAONnHdpRCIoNs8/). Assuming SRv6 as technol= ogy for WAN deployments, it could be certain cases where replicating traffi= c in two high-speed links (e.g., 100 Gbps or higher) with different lengths= in terms of hundreds of kms (for instance using different nation-wide link= s or submarine cables) could make this replication not working properly. As= suggested in such mail to DetNet, adding some clarification to that fact w= ould be necessary in my opinion (acknowledging that would not be the genera= l case, but yet operationally important in my view). I already proposed so= me text, but of course any other text would be ok. Best regards Luis ________________________________ Este mensaje y sus adjuntos se dirigen exclusivamente a su destinatario, pu= ede contener informaci=F3n privilegiada o confidencial y es para uso exclus= ivo de la persona o entidad de destino. Si no es usted. el destinatario ind= icado, queda notificado de que la lectura, utilizaci=F3n, divulgaci=F3n y/o= copia sin autorizaci=F3n puede estar prohibida en virtud de la legislaci= =F3n vigente. Si ha recibido este mensaje por error, le rogamos que nos lo = comunique inmediatamente por esta misma v=EDa y proceda a su destrucci=F3n. The information contained in this transmission is confidential and privileg= ed information intended only for the use of the individual or entity named = above. If the reader of this message is not the intended recipient, you are= hereby notified that any dissemination, distribution or copying of this co= mmunication is strictly prohibited. If you have received this transmission = in error, do not read it. Please immediately reply to the sender that you h= ave received this communication in error and then delete it. Esta mensagem e seus anexos se dirigem exclusivamente ao seu destinat=E1rio= , pode conter informa=E7=E3o privilegiada ou confidencial e =E9 para uso ex= clusivo da pessoa ou entidade de destino. Se n=E3o =E9 vossa senhoria o des= tinat=E1rio indicado, fica notificado de que a leitura, utiliza=E7=E3o, div= ulga=E7=E3o e/ou c=F3pia sem autoriza=E7=E3o pode estar proibida em virtude= da legisla=E7=E3o vigente. Se recebeu esta mensagem por erro, rogamos-lhe = que nos o comunique imediatamente por esta mesma via e proceda a sua destru= i=E7=E3o --_000_AM0PR07MB5938756D20424CA37531F67FAC372AM0PR07MB5938eurp_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi Luis,

 

Many thanks for the comments.

 

- MTU: yes, redundancy protection increases the pack= et size. It is the same as for other SRv6 tunnels. The size increase depend= s also on how many hops between the redundancy nodes are defined.

 

- End.R: right, the first redundancy node has some a= dditional tasks to do. The flow identification at the first redundancy node= is done based on the received packet header fields, and the result is adde= d in the form of a Flow-ID to the ARG part of the End.R. Downstream redundancy nodes can identify simple the= flows based on the Flow-ID value. The SeqNum is added by the first redunda= ncy node and used by all the downstream redundancy nodes. The SeqNum is add= ed also to the ARG part of the End.R. In order to avoid confusion the following change is proposed.

OLD TEXT

    Encapsulates flow identification = and sequence number in packets if

    the two information is not carrie= d in packets.

NEW TEXT

    Encapsulates flow identification = and sequence number in SRv6 packets.

END

 

- SeqNum size: yes, this was discussed in DetNet and= resulted in defining the 28 bit SeqNum format.

 

Thanks & Cheers

Bala’zs

 

From: LUIS MIGUEL CONTRERAS MURILLO <luismiguel.contrerasmurillo@tel= efonica.com>
Sent: Friday, April 17, 2026 6:01 PM
To: spring <spring@ietf.org>
Cc: Deterministic Networking Discussion List <detnet@ietf.org>= ; draft-ietf-spring-sr-redundancy-protection@ietf.org
Subject: Few more comments on draft-ietf-spring-sr-redundancy-protec= tion

 

Dear all,

 

Sharing few more comments related to draft-ietf-spri= ng-sr-redundancy-protection in SPRING but cc-ing DetNet because of the inte= rsection of the redundancy/PREF concept (that is, no ordering in this case)= .

 

  • It would be interesting to understand the potential impact on the MTU= due to the fact of activating the redundancy protection while traversing t= he network. This could be a limiting factor, or at least condition the applicability to the need of defining an= MTU size in the domain for being able to apply the solution.
  • In section 4.1, for End.R it is mentioned that “= ;Encapsulates flow identification and sequence number in packets if the two= information is not carried in packets”. But, how this is known? Adding some clarification could help.
  • Sequence= number size. I recall I raised this point during DetNet session in Madrid,= and also commented in DetNet list (https://mailarchive.ietf.org= /arch/msg/detnet/KoMjM68ZGtZ6fAONnHdpRCIoNs8/). Assuming SRv6 as technology for WAN deployments, it could be certain cases= where replicating traffic in two high-speed links (e.g., 100 Gbps or highe= r) with different lengths in terms of hundreds of kms (for instance using d= ifferent nation-wide links or submarine cables) could make this replication not working properly. As suggested in = such mail to DetNet, adding some clarification to that fact would be necess= ary in my opinion (acknowledging that would not be the general case, but ye= t operationally important in my view).  I already proposed some text, but of course any other text wo= uld be ok.

 

Best regards

 

Luis

=  


Este mensaje y sus adjuntos se dirigen exclusivamente a su destinatario, pu= ede contener informaci=F3n privilegiada o confidencial y es para uso exclus= ivo de la persona o entidad de destino. Si no es usted. el destinatario ind= icado, queda notificado de que la lectura, utilizaci=F3n, divulgaci=F3n y/o copia sin autorizaci=F3n puede e= star prohibida en virtud de la legislaci=F3n vigente. Si ha recibido este m= ensaje por error, le rogamos que nos lo comunique inmediatamente por esta m= isma v=EDa y proceda a su destrucci=F3n.

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Esta mensagem e seus anexos se dirigem exclusivamente ao seu destinat=E1rio= , pode conter informa=E7=E3o privilegiada ou confidencial e =E9 para uso ex= clusivo da pessoa ou entidade de destino. Se n=E3o =E9 vossa senhoria o des= tinat=E1rio indicado, fica notificado de que a leitura, utiliza=E7=E3o, divulga=E7=E3o e/ou c=F3pia sem autoriza=E7=E3o p= ode estar proibida em virtude da legisla=E7=E3o vigente. Se recebeu esta me= nsagem por erro, rogamos-lhe que nos o comunique imediatamente por esta mes= ma via e proceda a sua destrui=E7=E3o

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