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Re: [mpls] Concerns about ISD

John E Drake <jdrake@juniper.net> Tue, 12 April 2022 12:45 UTC

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From: John E Drake <jdrake@juniper.net>
To: Tianran Zhou <zhoutianran=40huawei.com@dmarc.ietf.org>, Tony Li <tony.li@tony.li>
CC: "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] Concerns about ISD
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References: <6cc272447d2f4c779e85d5c42d3b3c6c@huawei.com> <8623637D-A32E-47A4-B5FC-4D2CF40BEDD1@tony.li> <6199e0e886f9437c95ef9b70719b00ec@huawei.com> <BCFD3F4A-36D6-47C2-B907-FC40B402F97C@tony.li> <3fb1f261ddff48deb0c2ea083cdbd16f@huawei.com> <6B96F21B-9331-4FA8-AD7B-84A4CA8B6FAB@tony.li> <903c57a48280454091495673ec2fe275@huawei.com> <BD5C1BE7-4633-4B51-BAC1-B2AE1C537F36@tony.li> <ad6b8c42b0aa4880b9dee02516f5e46f@huawei.com> <F5BB2CEB-CC8C-4E71-A2E7-B4212878C3B1@tony.li> <aa9c4b913d844410b2af90c8db78c194@huawei.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/TdPswNyppSsBMSKKzjnjR5t-kkA>
Subject: Re: [mpls] Concerns about ISD
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Hi,

Comments inline.

Yours Irrespectively,

John



Juniper Business Use Only
From: mpls <mpls-bounces@ietf.org> On Behalf Of Tianran Zhou
Sent: Tuesday, April 12, 2022 2:36 AM
To: Tony Li <tony.li@tony.li>
Cc: mpls@ietf.org
Subject: Re: [mpls] Concerns about ISD

[External Email. Be cautious of content]

Hi Tony,

>>Pushing data to PSD and beyond the RLSD will cause systems to be excluded from the path or take a significant performance hit.

If I know the RLSD of each node, there are many ways to prevent some nodes from pushing data to PSD.

[JD]  Given that you *only* want to use PSD, what is the above sentence proposing?

I would like to know how ISD could survive if the ISD exceed the RLSD?

[JD]  The correct term is Network Actions  Sub-stack (NAS).  To answer your question, a transit node will miss the NAS regardless of whether it contains in-stack data.  This is the point that Tony has been making for the past few email iterations

Best,
Tianran

From: Tony Li [mailto:tony1athome@gmail.com] On Behalf Of Tony Li
Sent: Tuesday, April 12, 2022 2:03 PM
To: Tianran Zhou <zhoutianran@huawei.com<mailto:zhoutianran@huawei.com>>
Cc: mpls@ietf.org<mailto:mpls@ietf.org>
Subject: Re: [mpls] Concerns about ISD


Hi Tianran,

ZTR2> PSD can work with RLSD, I cannot see how it will hinder the interoperability.


Pushing data to PSD and beyond the RLSD will cause systems to be excluded from the path or take a significant performance hit.

Tony

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