Hi Tony,

From: Tony Li <[email protected]> On Behalf Of Tony Li
Sent: Monday, September 9, 2024 7:20 PM
To: DECRAENE Bruno INNOV/NET <[email protected]>
Cc: Les Ginsberg <[email protected]>; Les Ginsberg 
<[email protected]>; Yingzhen Qu <[email protected]>; 
lsr-chairs <[email protected]>; lsr <[email protected]>
Subject: Re: [Lsr] WG Last Call for draft-ietf-lsr-multi-tlv (7/1/2024 - 
7/15/2024)

Hi Bruno,

As you know, there are several TLVs that have been MP-TLV for a very long time 
(e.g. ROUTER CAPABILITY).  Having these be MP is a practical operational 
necessity already today.  Disabling this on any node would likely break any 
network that has some fairly common features (e.g. FlexAlgo) enabled.

[Bruno] I meant for the newly defined MP-TLV. The one for which MP handling is 
changed by this document.  TLVs which have been defined with MP-TLV from day 
one do not create interop issue. It’s the change of behavior when handling TLV 
X of a new implementation which create an interop issue with the handling of 
TLV X from old implementations.
If it’s just a wording issue, I’m confident that someone can craft the right 
wording.

What is the point of a knob that cannot be turned off?
[Bruno] I agree that the point is to be able to turn it off.


Then you’re back to requiring per-TLV configuration. No thanks.

[Bruno2] Nope. I’ve written down my proposed change and it does not include 
that. If you are ok with a required _single_ configuration controls to 
enable/disable generation of MP-TLVs (for the TLVs extended by this draft) we 
are good. Per-TLV configuration is out of scope of this thread.

Also, I don’t think we’re trying to create any “newly defined MP-TLV”.  The 
point is to codify what has been done and create a default path moving forward.

[Bruno2] RFC5305 does not support MP-TLV for TLV 22 and 
draft-ietf-lsr-multi-tlv acknowledges that.
Specification of MP-TLV for TLV 22 is introduced and defined in 
draft-ietf-lsr-multi-tlv

--Bruno

T

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