LSR WG, Section 9 of draft-ietf-lsr-isis-srv6-extensions-05 defines the SRv6 SID Structure Sub-Sub-TLV. In particular, it defines encoding for the locator block length and the locator node length. The text refers to [I-D.ietf-spring-srv6-network-programming] for the definition of these concepts.
As far as I can tell, the only reference to locator block and locator node in draft-ietf-spring-srv6-network-programming-10 is section 3.1 which has the following text: A locator may be represented as B:N where B is the SRv6 SID block (IPv6 subnet allocated for SRv6 SIDs by the operator) and N is the identifier of the parent node instantiating the SID. I think that we need a much more detailed description of the locator block and locator node. Thanks, Chris
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