Hi Marina,
I'll raise the same comment/question I had on the mic at ietf-124: what are the
concerns with PCC just delegating the lsp to another active session when it
becomes an orphan?
This is an option specified in RFC8231 Section 5.7.5 and RFC8281 section 6.
Yes, your slides do point this as being an option ("possible solution: bullet
5) but does not seem to outline why it's not an acceptable solution. As we
discussed in session and you do indeed have on your slides, this would simply
be a local preferencing, regardless if there's 1,2,3 or 5 PCEs.
Would this not be simpler? It involves no new extensions, and no new message
exchange or definitions, and already RFC specified.
My concerns with a notify-like behavior to require PCE to ask for delegation is
from a few angles, such as:
*
You now need to notify all PCE(s) everytime delegation state changes, per path.
This is noise that did not necessarily exist before. A notification will happen
both for delegation removal, and re-delegation (when no longer orphaned) -> to
all connected PCEs.
*
The final delegation is non-determistic if there's > 2 PCEs. If there are 3 or
more, and the active one fails, it will be a race condition between the other
PCE's as to which one will succeed in grabbing delegation. Perhaps it does not
matter at the end of the day, but it does become an operational consideration
and aids to troubleshooting headaches
*
There's additional overhead for -all- PCEs and affected PCC interaction: notify
not delegated, ask for delegation (race condition), then report delegation (to
the winning PCE) and notify delegation info (to the other PCEs). It's quite a
lot more messaging, compared to just PCC simply sending PcRpt+Delegate to the
next-best-preference PCE
*
Consider that a death of PCE is likely to affect a large number of PCCs, the
above bullet points can involve a lot of messaging and processing.
Thanks
Andrew
From: Marina Fizgeer <[email protected]>
Date: Monday, November 17, 2025 at 5:12 PM
To: Dhruv Dhody <[email protected]>, Andrew Stone (Nokia)
<[email protected]>, Samuel Sidor (ssidor) <[email protected]>
Cc: [email protected] <[email protected]>, Marina Fizgeer <[email protected]>
Subject: RE: [EXTERNAL] [Pce] Re: PCE WG Minutes for IETF 124
CAUTION: This is an external email. Please be very careful when clicking links
or opening attachments. See the URL nok.it/ext for additional information.
Hello,
Please help me move forward with the PCE Redundancy issues and my proposal. We
discussed the need for a dedicated additional meeting to discuss existing
options and my proposal. I've tried to analyze this in the attached document.
What should be the next steps? Thank you in advance.
Best regards,
[Logo]<https://ribboncommunications.com/>
Marina Fizgeer
Sr. Manager, Systems Architecture | Ribbon
M +972.544860016
Petah Tikva, Israel
[Banner]<https://ribboncommunications.com/?_gl=1*6qlbuc*_gcl_au*MjA3NzE5OTk5NC4xNzI4NDE0NDY4*_ga*NTIxNzg1MDgxLjE3Mjg0MTQ0NjM.*_ga_VCEZ9Q3S3Y*MTcyODQ1MjEzMC4yLjEuMTcyODQ1MjE4OS4xLjAuMTA4NjExNTU4>
From: Marina Fizgeer
Sent: Tuesday, November 11, 2025 5:42 PM
To: 'Dhruv Dhody' <[email protected]>; Andrew Stone (Nokia)
<[email protected]>; Samuel Sidor (ssidor)
<[email protected]>
Cc: [email protected]
Subject: RE: [EXTERNAL] [Pce] Re: PCE WG Minutes for IETF 124
Hi, dear friends,
Following up on my presentation and our discussion at the EITF 124 PCE meeting,
I am sending the supplement a presentation with a detailed description of the
problem, the options we have thought about and our proposed solution, which
seems to me simple to implementation and flow itself.
Your opinion is very important to me. Thank you in advance.
Best regards,
[Logo]<https://ribboncommunications.com/>
Marina Fizgeer
Sr. Manager, Systems Architecture | Ribbon
M +972.544860016
Petah Tikva, Israel
[Banner]<https://ribboncommunications.com/?_gl=1*6qlbuc*_gcl_au*MjA3NzE5OTk5NC4xNzI4NDE0NDY4*_ga*NTIxNzg1MDgxLjE3Mjg0MTQ0NjM.*_ga_VCEZ9Q3S3Y*MTcyODQ1MjEzMC4yLjEuMTcyODQ1MjE4OS4xLjAuMTA4NjExNTU4>
From: Dhruv Dhody <[email protected]<mailto:[email protected]>>
Sent: Monday, November 10, 2025 6:50 AM
To: Andrew Stone (Nokia)
<[email protected]<mailto:[email protected]>>
Cc: [email protected]<mailto:[email protected]>
Subject: [EXTERNAL] [Pce] Re: PCE WG Minutes for IETF 124
Hi,
Thanks Andrew!
I made some tiny edits, you can find the latest version at -
https://datatracker.ietf.org/doc/minutes-124-pce-202511061430/
Thanks!
Dhruv
On Sat, Nov 8, 2025 at 5:22 AM Andrew Stone (Nokia)
<[email protected]<mailto:[email protected]>>
wrote:
Hi PCE WG,
Please find the minutes for PCE WG session at
https://datatracker.ietf.org/meeting/124/materials/minutes-124-pce-202511061430-00.md
Thanks to those who contributed to the minutes.
Please reach out to [email protected]<mailto:[email protected]> in case any
correction needs to be made.
Thanks,
Andrew (PCE Secretary)
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