Ron,

As we already explained on the mailer a few weeks ago, the next big change for 
the NET-PGM draft is the alignment of pseudocodes with the SRH draft.

Thanks,
Pablo.

From: spring <[email protected]> on behalf of Ron Bonica 
<[email protected]>
Date: Wednesday, 24 July 2019 at 13:36
To: SPRING WG <[email protected]>
Subject: [spring] draft-ietf-spring-srv6-network-programming-01 - Effective 
Next Header (ENH)

Authors,

The END.DX2, END.DX2V, END.DT2U, END.DT2M, END.DX4, END.DT4, END.DX6, END.DT6 
SIDs all reference the Effective Next Header (ENH). The ENH is the first 
upper-layer header beyond the IPv6 header chain.

In many cases, the ENH immediately follows the SRH. In these cases, it is easy 
to identify the ENH and SID processing is easy.

In other cases, the ENH does not immediately follow the SRH. In these cases, 
SID processing is more difficult because the ENH cannot be identified without 
reading ahead to the end of the extension header chain.

In one final case, when an ESP header falls between the SRH and the ENH, SID 
processing becomes very difficult because the ENH cannot be identified until 
the payload is decrypted.

At very least, you should address these issues in the document. At best, you 
should consider encoding these “destination SIDs” in IPv6 Destination options.

                                                                                
                                  Ron


Juniper Business Use Only
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