Re: [Teas] Preemption priority in GMPLS signaling for SMP

Adrian Farrel <> Wed, 28 October 2020 20:59 UTC

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From: "Adrian Farrel" <>
To: "'Jeong-dong Ryoo'" <>, <>, <>
Cc: "'Bin Yeong Yoon'" <>, "'Hejia \(Jia\)'" <>, "'Peter Park'" <>, "'Italo Busi'" <>
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Date: Wed, 28 Oct 2020 20:59:34 -0000
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Subject: Re: [Teas] Preemption priority in GMPLS signaling for SMP
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Hey Jeong-dong,


Can you clarify (for those who have not been following SMP closely) why existing GMPLS signaling pre-emption priorities (session attribute set-up and hold priorities) don’t provide you with what you need?


In any case, I would recommend that you use the same order of ranking used for the set-up and hold priorities. That is, 0 is the highest priority. This seems to be what you are suggesting.







From: Teas <> On Behalf Of Jeong-dong Ryoo
Sent: 28 October 2020 14:38
Cc: Bin Yeong Yoon <>kr>; Hejia (Jia) <>om>; Peter Park <>om>; Italo Busi <>
Subject: [Teas] Preemption priority in GMPLS signaling for SMP


Dear TEAS WG, 
This email is to solicit your opinion on how to implement the preemption priority for GMPLS signaling extentions for Shared Mesh Protection, draft-ietf-teas-gmpls-signaling-smp-04. 
As described in draft-ietf-teas-gmpls-signaling-smp-04, the preemption priority is to resolve the competition for shared resources among multiple protecting LSPs, when controlled by the Automatic Protection Switching (APS).   
The authors of this draft would like to define one octet for the preemption priority values and state that a lower value has a higher priority. And the number of priority levels is up to the network operator. We also want to indicate the preemption priority of a protecting LSP in a new field, by shrinking the size of Reserved field, within the PROTECTION object. 
We would appreciate if you can provide your feedbacks on our proposal above. 
Best regards, 
Jeong-dong (on behalf of co-authors)