Note that while the Spring working group is consulted about new segment
types by the registry designated expert, the registry is "specification
required", so any WG can create entries if they so choose.
Yours,
Joel
On 3/6/2026 12:52 PM, Tony Li wrote:
On Mar 6, 2026, at 9:25 AM, Joel Halpern - jmh.direct at joelhalpern.com
<[email protected]> wrote:
In regard to Segment Routing Policy as defined by RFC 9256 and the MPLS Network
Action (MNA) work that is being standardized by the MPLS working group, please
express an opinion as to whether:
1) An MNA Substack may never be considered a segment in the sense of RFC 9256
section 4;
2) Some MNA substacks may be considered segments in the sense of RFC 9256
Section 4 (possibly with a new segment type, possibly with an existing segment
type)
3) MNA substacks are segments in the sense of RFC 9256 section 4 (possibly with
a new segment type, possibly with an existing segment type)
An MNA ISD Substack is a set of LSEs. It contains no forwarding labels. To my
read, it does not fall into any of the types currently defined in RFC 9256
section 4.
Whether or not we want to declare a new segment type is of course up to the WG,
and depends entirely on whether there is benefit to doing so. I am not yet
convinced that there is benefit, but am open to constructive arguments.
Regards,
Tony
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