I can understand why the operator may want separate statistics for
separate subsets of traffic over a path. But then the ID being used
does not seem to be a path ID. It identifies something, but I am not
sure what. If it identified just the path, then all the packets for all
applications using the same path would be required to have the same ID,
which you are explicitly saying is not the case.
Yours,
Joel
On 9/5/2024 11:44 AM, Cheng Li wrote:
Hi Lijie,
Yes, it is common for operators to carry multiple services with
different policies over links.
That text is for the use cases that an operator would like to measure
the packets for the paths(identified by its segment list) within its
Policy. But on the egress node, the node will get the aggregated
statistics of packets since different services may reuse the same
segment list/path.
In the cases that operator would like to measure the paths in
different policies/services, same segment list/path in a specific
policy should be identified, and differentiated with the same segment
list in other policies. By using different Path Segment ID, same
segment List/path can be differentiated, so that the traffic can be
measured alone. Otherwise, only the aggregated result will be produced
on the egress node.
Hope I make it clear. Thank you for your comment. We may need to add
some text in this section? You are welcome to share your proposal.
Thanks,
Cheng
*From:*LiJie Deng <denglijie1...@gmail.com>
*Sent:* Thursday, September 5, 2024 11:08 AM
*To:* spring@ietf.org
*Subject:* [spring] Re: spring Digest, Vol 129, Issue 43
Hi Cheng,
I have a question about the draft.
There is this sentence in the "introduction" section: "Furthermore,
different SRv6 policies may use the same segment list for different
candidate paths, so the traffic of different SRv6 policies are merged,
resulting in the inability to measure the performance of the specific
path."
*-* I don’t see the issue with "merged traffic of different SRv6
policies", and how it relates to "the inability to measure the
performance of the specific path". For operators, it’s very common to
carry multiple services with different policies over links. In
addition, there are many methods to measure service performance, such
as IOAM.
BR,
Lijie
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