Hi authors,

When I read the document, I noticed that the format of the SRv6 SID Structure 
Sub-Sub-TLV has no reserved bits, which may bring troubles for future 
extensions.

What if new architecture of SID is proposed? We have to introduce a new SID 
structure TLV. But actually a backward-compatible format design of this TLV can 
solve this kind of problems.

IMHO, if we introduced 16 bits reserved bits after the Length, then the length 
aligns with  64 bits and the future SID structure can be supported.


[cid:image002.jpg@01D648CD.39194020]

Thanks,
Cheng

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