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From: "Zafar Ali (zali)" <zali@cisco.com>
To: "Dongjie (Jimmy)" <jie.dong=40huawei.com@dmarc.ietf.org>,
	"adrian@olddog.co.uk" <adrian@olddog.co.uk>, 'TEAS WG' <teas@ietf.org>,
	"6man@ietf.org" <6man@ietf.org>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: [mpls] Re: [spring] MPLS WGLC on
 draft-ietf-mpls-mna-nrp-selector
Thread-Index: AQHcZGbU1j3Z78dd9km8IXF3u1/L8Q==
Date: Wed, 3 Dec 2025 15:09:33 +0000
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Subject: =?utf-8?q?=5BIPv6=5DRe=3A_=5Bmpls=5D_Re=3A_=5Bspring=5D_MPLS_WGLC_on_draft-i?=
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Hi

I agree with Jie that +ACI- it would be better to have the same number of b=
its in the forwarding plane and in the control plane, which could make the =
mapping much easier+ACI-.
Keep length consistent between MPLS and SRv6 is also good as it makes mappi=
ng easier.

I also believe that +ACI-a smaller+ACI- numbers of NRPs are required as eac=
h NRP represent an instance in management plane and hardware scale prohibit=
s supporting larger numbers of NRP.
I do not see any reason why a 20-bit NRP Selector would not suffice, across=
 all data planes.

Thanks

Regards +ICY- Zafar


+/v8-On 12/1/25, 7:56 AM, +ACI-Dongjie (Jimmy)+ACI- +ADw-jie.dong+AD0-40hua=
wei.com+AEA-dmarc.ietf.org +ADw-mailto:40huawei.com+AEA-dmarc.ietf.org+AD4A=
Pg- wrote:


Hi Adrian,


I thought I have replied to this mail, apparently I didn't press the send b=
utton.


Regarding the length of the NRP Selector ID, I agree it would be better to =
have the same number of bits in the forwarding plane and in the control pla=
ne, which could make the mapping much easier.


IMO the decision made by TEAS of allowing different length of the ID acknow=
ledged the difference in data plane protocols, which makes sense. Protocols=
 like MPLS may have limitation in encoding, and may not be required to prov=
ide the same scalability as IPv6/SRv6 does.


If the length of NRP Selector ID in MPLS and SRv6 domain are different, map=
ping can be performed at the boundaries. Actually even if the length are th=
e same, mapping of the ID value at domain boundaries may still be needed.


That said, it would be good if there can be one option in which they have t=
he same length, preferably it is also the same as the ID length in the cont=
rol plane.


Best regards,
Jie



Cisco Confidential
-----Original Message-----
From: Adrian Farrel +ADw-adrian+AEA-olddog.co.uk +ADw-mailto:adrian+AEA-old=
dog.co.uk+AD4APg-
Sent: Monday, November 17, 2025 12:23 AM
To: 'TEAS WG' +ADw-teas+AEA-ietf.org +ADw-mailto:teas+AEA-ietf.org+AD4APgA7=
- 6man+AEA-ietf.org +ADw-mailto:6man+AEA-ietf.org+AD4AOw- spring+AEA-ietf.o=
rg +ADw-mailto:spring+AEA-ietf.org+AD4-
Cc: 'mpls' +ADw-mpls+AEA-ietf.org +ADw-mailto:mpls+AEA-ietf.org+AD4APg-
Subject: +AFs-spring+AF0- MPLS WGLC on draft-ietf-mpls-mna-nrp-selector


Please note that the MPLS working group is holding a last call on draft-iet=
f-mpls-mna-nrp-selector. I am the document shepherd.


There are issues around the size of the NRP Selector / identifier that may =
be of relevance to TEAS, 6MAN, and SPRING. I'd appreciate it if any discuss=
ions could take place on the MPLS list so that it is easier to coordinate.


The questions are:


1. How many bits are needed to encode the NRP Selector in the MPLS forwardi=
ng plane?
It has been suggested that it is important to allow the same number of bits=
 in the forwarding plane as are available in the control plane.
It has also been pointed out that it is always possible to map between the =
control plane representation and the forwarding plane representation, and i=
t is possible to limit the expression of the identifier in the control plan=
e such that it is suitable for a particular data plane.
Here, the opinion of TEAS may be helpful to us.


2. Should the encoding of the NRP Selector in the MPLS and SRv6 forwarding =
planes be identical?
It has been suggested that in multi-technology-domain scenarios, it would b=
e helpful to have the same NRP Selector values in each domain. This could m=
ake management and debugging simpler.
It has been pointed out that if the sizes of NRP Selector are different in =
the two domains, the smaller can be used as a subset of the larger, to enab=
le multi-domain operation, or that mapping can be performed at the domain b=
oundaries.
This question is particularly relevant to 6MAN and SPRING.


Thanks for any thoughts.


Adrian














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