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[ippm] draft-ietf-ippm-rfc8889bis

John Scudder <jgs@juniper.net> Tue, 05 July 2022 21:05 UTC

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From: John Scudder <jgs@juniper.net>
To: "draft-ietf-ippm-rfc8889bis@ietf.org" <draft-ietf-ippm-rfc8889bis@ietf.org>, "ippm@ietf.org" <ippm@ietf.org>
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Date: Tue, 05 Jul 2022 21:05:05 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/ippm/rFVE0uHkgdAwZjZrwKVA8PbNQf0>
Subject: [ippm] draft-ietf-ippm-rfc8889bis
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Hi Authors (and WG),

I have a question about Section 5, Network Clustering. It says,

   A cluster graph is a subnetwork of the entire monitoring network
   graph that still satisfies the packet loss equation (introduced in
   the previous section), where PL in this case is the number of packets
   lost in the cluster.  As for the entire monitoring network graph, the
   cluster is defined on a per-flow basis.

But when I look back at the previous section, all I see is

   PL = (PI1 + PI2 +...+ PIn) - (PO1 + PO2 +...+ POm)

But that’s just a definition of what PL is, it can take on any value based on its inputs. What does it mean for it b be “satisfied”? That’s a term that typically requires us to state what condition is to be satisfied, and as far as I can tell you haven’t stated a condition.

Thanks,

—John

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