On 4/5/2016 8:05 AM, Robert Raszuk wrote:
Wouldn't it be more flexible to simply define new attribute to carry > the stack within any SAFI as an opaque to BGP data ? That way one
can > easily use it in unicast SAFI or even in FlowSpec.
That can be done with the Tunnel Encapsulation attribute. Look at, for example, at draft-previdi-idr-segment-routing-te-policy (though I think that document still needs quite a bit of work).
If as it turns out if the primary motivation for 3107bis is to > distribute label stack for segment routing
3107bis fixes a number of problems in 3107, and it also specifies how to use the "multiple labels" feature without tickling known bugs in existing deployments. One could argue about whether this is the best tool for various segment routing applications, but that's outside the scope of the draft. And there are use cases that have nothing to do with segment routing; see, e.g., the discussion of context labels in section 4.
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