Re: [mpls] working group adoption poll on draft-bocci-mpls-miad-adi-requirements

Haoyu Song <haoyu.song@futurewei.com> Wed, 20 April 2022 18:18 UTC

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From: Haoyu Song <haoyu.song@futurewei.com>
To: John E Drake <jdrake@juniper.net>
CC: Tony Li <tony.li@tony.li>, "Dongjie (Jimmy)" <jie.dong@huawei.com>, "mpls@ietf.org" <mpls@ietf.org>, "pals-chairs@ietf.org" <pals-chairs@ietf.org>, "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "draft-bocci-mpls-miad-adi-requirements@ietf.org" <draft-bocci-mpls-miad-adi-requirements@ietf.org>, DetNet Chairs <detnet-chairs@ietf.org>
Thread-Topic: [mpls] working group adoption poll on draft-bocci-mpls-miad-adi-requirements
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Subject: Re: [mpls] working group adoption poll on draft-bocci-mpls-miad-adi-requirements
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John,

Can you name “a single entity” as “sub-stack” which implies more than one entities?

In essence, the NAS is a new header which is inserted into MPLS label stack under the constraints of the MPLS label format. It has nothing to do with a label (so “sub” to what?). And the operation on it is certainly not a “stack operation” as well. It’s embedded in the label stack. You scan the label stack to reach it, parse it, and process it. When it emerge on the ToS, we still don’t know the behavior for handling it yet. Reinsert it to somewhere in the label stack? Whatever it is, this is not “stack operation”.

Best regards,
Haoyu

From: John E Drake <jdrake@juniper.net>
Sent: Wednesday, April 20, 2022 10:04 AM
To: Haoyu Song <haoyu.song@futurewei.com>
Cc: Tony Li <tony.li@tony.li>; Dongjie (Jimmy) <jie.dong@huawei.com>; mpls@ietf.org; pals-chairs@ietf.org; mpls-chairs@ietf.org; draft-bocci-mpls-miad-adi-requirements@ietf.org; DetNet Chairs <detnet-chairs@ietf.org>
Subject: Re: [mpls] working group adoption poll on draft-bocci-mpls-miad-adi-requirements

Haoyu,

If you consider the NAS as a single entity it is completely consistent with the definition of a stack.  I think this remark is spurious and non-productive.

John
Sent from my iPhone


On Apr 20, 2022, at 12:58 PM, Haoyu Song <haoyu.song@futurewei.com<mailto:haoyu.song@futurewei.com>> wrote:

[External Email. Be cautious of content]


I propose Network Action Sub-stack Indcator (NSI) for this purpose.  Proposed definition:

                            An LSE used to indicate the presence of a Network Action Sub-stack.

We should also revise the definition of NAS to use this.


Hi Tony,

Stack means “first in last out”. It is used for MPLS label stack to describe the label processing procedure.
The encoded ISD is neither labels any more nor a stack in any sense, so both “sub” and “stack” are improper terms in my opinion. Thanks.

Best regards,
Haoyu

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