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Re: [mpls] Concerns about ISD

Tony Li <tony.li@tony.li> Tue, 19 April 2022 14:25 UTC

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Sender: Tony Li <tony1athome@gmail.com>
From: Tony Li <tony.li@tony.li>
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Date: Tue, 19 Apr 2022 07:24:56 -0700
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Cc: Haoyu Song <haoyu.song@futurewei.com>, Tianran Zhou <zhoutianran=40huawei.com@dmarc.ietf.org>, "mpls@ietf.org" <mpls@ietf.org>, John E Drake <jdrake=40juniper.net@dmarc.ietf.org>
To: Robert Raszuk <rraszuk@gmail.com>
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> <BY3PR05MB8081937B52E657713E8293BFC7ED9@BY3PR05MB8081.namprd05.prod.outlook.com> <a29c96be774845e582a66700d2264f7b@huawei.com> <BY3PR05MB8081870EF67C551727BBE2CFC7EC9@BY3PR05MB8081.namprd05.prod.outlook.com> <d5521b3972dd43e38276afbbdc7c2bda@huawei.com> <BY3PR05MB80813C7CAD7F2C12C36FB513C7EE9@BY3PR05MB8081.namprd05.prod.outlook.com> <BY3PR13MB47879EB8A582437DE936688C9AEE9@BY3PR13MB4787.namprd13.prod.outlook.com> <C493D0B8-4B57-4D19-BC27-70ABD7F50356@tony.li> <BY3PR13MB47878B227A37AAA06625194B9AEE9@BY3PR13MB4787.namprd13.prod.outlook.com> <0318B3A3-2884-4FD6-B5EF-377481D2657B@tony.li> <BY3PR13MB4787752FB6D147281A7150789AEE9@BY3PR13MB4787.namprd13.prod.outlook.com> <602D6128-3BE3-4A2D-B5C2-019AE0FADF09@tony.li> <BY3PR13MB47876188B5927A51BD4F4E739AEE9@BY3PR13MB4787.namprd13.prod.outlook.com> <BCB99042-ECA3-40C6-8581-FA1656DDF987@tony.li> <BY3PR13MB4787468DAA96610B9933E1659AF19@BY3PR13MB4787.namprd13.prod.outlook.com> <EB04096F-70B7-4FF0-973F-6C7C1FDDE837@tony.li> <BY3PR13MB47874EBD4E397AB18CD8AF819AF39@BY3PR13MB4787.namprd13.prod.outlook.com> <7451CC1D-88A7-4D13-9BE5-44BCBE95337A@tony.li> <BY3PR13MB478725F22B60E681ABF94BC79AF39@BY3PR13MB4787.namprd13.prod.outlook.com> <CA+b+ERmH2vMizOBJpTRezQRJMU-2Y4y4TL4wzOY+o=yMyDB5qg@mail.gmail.com> <BY3PR13MB4787E7127067365E17C8CA549AF29@BY3PR13MB4787.namprd13.prod.outlook.com> <8E42833F-A9A9-4B70-803F-1CCBFD093641@tony.li> <CA+b+ER=b4vwPqOzHNwObBTN_9+V_Y2ZxHTPvEzce126pxgxo9A@mail.gmail.com>
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Subject: Re: [mpls] Concerns about ISD
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Hi Robert,

> > Both case 2 and 3 are going to have performance implications. The only case that is going to avoid all 
> > performance impact will be if the LSP use signaling to avoid all nodes that do not support MNA and 
> > have no actions to perform.
> 
> Can you elaborate what exactly you mean by "signalling" - it is a very broad term :) 
> 
> In general yes I do agree - modulo depending on your definition. 



In the discussions that I’ve had, the suggestions have always been that we would have an MNA capability and a per-action capability carried around in some dump truck.  The precedent is RFC 9088.

Thus, the LER would be responsible for applying MNA and actions if and only if all nodes on the path supported the actions required.

Tony

p.s. As you know, my preference for a dump truck is spelled DROID. ;-)

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