[spring] Few more comments on draft-ietf-spring-sr-redundancy-protection

[LUIS MIGUEL CONTRERAS MURILLO <[e-mail]>]

Dear all,

Sharing few more comments related to draft-ietf-spring-sr-redundancy-protection in SPRING but cc-ing DetNet because of the intersection 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 the 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 higher) with different lengths in terms of hundreds of kms (for instance using different 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 necessary in my opinion (acknowledging that would not be the general case, but yet operationally important in my view).  I already proposed some text, but of course any other text would be ok.

Best regards

Luis

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