Dear colleagues,
I have a couple of questions about the life span of the Path Segment.
Suppose that some entity has computed and instantiated an SR LP that follows a
specific path from the ingress node to the egress node across a single IGP
domain. This path is expressed as a sequence of valid IGP Segments (e.g., Node
and/or Adjacency segments) .
Suppose also that a Path Segment has been allocated by the egress node for this
path, and the ingress node is aware of this and inserts the label acting as the
SID for the Path segments immediately after the last SID of the path.
Now my questions:
1. What happens to the Path Segment when one of the IGP segments defining
the original path fails?
a. To the best of my understanding the path itself becomes invalid
b. Will the Path Segment that identifies the now invalid path be retained
indefinitely, or would it be invalidated as well and the label acting as its
SID released?
2. Suppose that the entity that has computed and instantiated the
original path re-computes it and instantiate a new valid path.
a. Should the new path (that replaces the invalidated original one) be
allocated with the same Path Segment as the original path, or should a new Path
Segment be allocated for it?
b. If the Path Segment allocated for the invalidated path is released
(see (1b) above), can the label that identified it be re-used as the Path
Segment ID immediately, or only after some delay?
>From my POV the answers to these questions do not depend on the actual method
>by which the Path Segments are allocated and propagated from the egress node
>to the ingress one.
And while my questions explicitly mention IGP Segments that define the SR LSP
for which the Path Segment is allocated, the desired behavior should not depend
on the type of segments used in the definition of the path.
Your feedback would be highly appreciated.
Regards, and lots of thanks in advance,
Sasha
Office: +972-39266302
Cell: +972-549266302
Email: [email protected]
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