Hi Tony, The moment I sent the note I knew you are going to say this:
"You can imagine another set of 4 links tied to a different NPU in the same box." But then noticing this quote: "Otherwise, its cumulative PSP is equal to the interface's PSP plus the PSP of the interface's Parent Power Groups, recursively." I am still not convinced how this additional notion of flooding power groups helps. Doubt --> What happens if two of those power groups (both on the same box) advertise the same PCPPS metric ? Or would that be treated as misconfiguration ? Thx, R. On Thu, Sep 24, 2026 at 11:37 PM Tony Li <[email protected]> wrote: > Hi Robert, > > > NPU consumes 100W and serves 4 active links with each laser of 10W. > > So you can advertise each link with the PCPPS metric of (directly mapping) > 35. (25 as 100/4 + 10) > > > > Yes, you can do that, but you lose the relationship between the interfaces > and you need that information if you want to power-sleep the NPU. > > You can imagine another set of 4 links tied to a different NPU in the same > box. You’d like to consolidate traffic on one NPU or the other, but not > power-sleep four random links and neither NPU. > > > How else would headend introduce Power Groups to the metric in CSPF ? > > > > As described in PCPPS, the metric modifcation involves the potential power > savings of an interface and all of it’s parent power-groups, hierarchically. > > Otherwise, its cumulative PSP is equal to the interface's PSP plus the PSP > of the interface's Parent Power Groups, recursively. > > > Cheers, > Tony > >
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