Re: [mpls] Poll 2: New SPL vs re-purposed ELI for carrying Network Action Indicators
bruno.decraene@orange.com Mon, 20 June 2022 15:38 UTC
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From: bruno.decraene@orange.com
To: Greg Mirsky <gregimirsky@gmail.com>
CC: Tony Li <tony.li@tony.li>, "Zafar Ali (zali)" <zali@cisco.com>, "mpls@ietf.org" <mpls@ietf.org>, "pals-chairs@ietf.org" <pals-chairs@ietf.org>, "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, DetNet Chairs <detnet-chairs@ietf.org>
Thread-Topic: [mpls] Poll 2: New SPL vs re-purposed ELI for carrying Network Action Indicators
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Date: Mon, 20 Jun 2022 15:38:36 +0000
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Subject: Re: [mpls] Poll 2: New SPL vs re-purposed ELI for carrying Network Action Indicators
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Hi Greg, Please see inline [Bruno] From: Greg Mirsky <gregimirsky@gmail.com> Sent: Friday, June 17, 2022 9:56 PM Hi Bruno, thank you for the expedient response. If I understand you correctly, PSD can be used as part of draft-decraene-mpls-slid-encoded-entropy-label-id. [Bruno] I would phrase it differently: - draft-decraene-mpls-slid-encoded-entropy-label-id can be used to carry 8 indicators in the stack while being usable with existing LSP Egress (more indicators would require extension on the LSP egress) - one of these indicators may be used to indicate the presence of PSD. The format/solution for PSD is orthogonal; one example being https://datatracker.ietf.org/doc/html/draft-jags-mpls-ext-hdr-00#section-5 Regards, --Bruno If that is the case, I think adding more information on how PSD can be used by the mechanism described in draft-decraene-mpls-slid-encoded-entropy-label-id would be helpful. Regards, Greg On Fri, Jun 17, 2022 at 9:54 AM <bruno.decraene@orange.com<mailto:bruno.decraene@orange.com>> wrote: Hi Greg, Please see inline [Bruno] From: Greg Mirsky <gregimirsky@gmail.com<mailto:gregimirsky@gmail.com>> Sent: Friday, June 17, 2022 5:46 PM To: DECRAENE Bruno INNOV/NET <bruno.decraene@orange.com<mailto:bruno.decraene@orange.com>> Cc: Tony Li <tony.li@tony.li<mailto:tony.li@tony.li>>; Zafar Ali (zali) <zali@cisco.com<mailto:zali@cisco.com>>; mpls@ietf.org<mailto:mpls@ietf.org>; pals-chairs@ietf.org<mailto:pals-chairs@ietf.org>; mpls-chairs@ietf.org<mailto:mpls-chairs@ietf.org>; DetNet Chairs <detnet-chairs@ietf.org<mailto:detnet-chairs@ietf.org>> Subject: Re: [mpls] Poll 2: New SPL vs re-purposed ELI for carrying Network Action Indicators Hi Bruno, you've said that your proposal allows for up to 8 MNA indicators. How do you envision the encoding of data associated with these indicators? [Bruno] Two paths : - post stack data. - in-stack data located after the ELI, EL e.g. as proposed in draft-jags-mpls-ext-hdr (but different encoding would also work) At this point, post-stack data is probably my preference as the use of the label stack is already specified/used hence brings constraints. Regards, --Bruno Re-use the EL space? Or these can be only no-data MNAIs? Regards, Greg On Fri, Jun 17, 2022 at 2:03 AM <bruno.decraene@orange.com<mailto:bruno.decraene@orange.com>> wrote: Tony, Orange Restricted Orange Restricted Orange Restricted From: Tony Li <tony1athome@gmail.com<mailto:tony1athome@gmail.com>> On Behalf Of Tony Li Sent: Friday, June 17, 2022 5:26 AM To: Zafar Ali (zali) <zali@cisco.com<mailto:zali@cisco.com>> Cc: Kireeti Kompella <kireeti.ietf@gmail.com<mailto:kireeti.ietf@gmail.com>>; DECRAENE Bruno INNOV/NET <bruno.decraene@orange.com<mailto:bruno.decraene@orange.com>>; mpls@ietf.org<mailto:mpls@ietf.org>; pals-chairs@ietf.org<mailto:pals-chairs@ietf.org>; mpls-chairs@ietf.org<mailto:mpls-chairs@ietf.org>; DetNet Chairs <detnet-chairs@ietf.org<mailto:detnet-chairs@ietf.org>> Subject: Re: [mpls] Poll 2: New SPL vs re-purposed ELI for carrying Network Action Indicators Zafar, Again, my problem with Bruno's draft is that the limited space found in the ELI/EL LSE's is clearly insufficient to begin to capture the use cases that we already can foresee for MNA, much less provide any room for growth. It doesn't scale. We need more bits. [Bruno] Thank you for providing a technical argument. draft-decraene-mpls-slid-encoded-entropy-label-id provides 8 indicators while being backward compatible with existing egress/signaling. If more are required, solution can be extended to provide more indicators (and data) but at the cost of requiring new dataplane feature on the LSR egress (and new signaling). Just like the proposals using a new SPL. The net benefit is that in the short/medium term more devices/deployments can start using those 8 indicators, while waiting for the new generation to support the new proposal. Regards, --Bruno For that reason alone, Bruno's draft is not a tenable solution to MNA and discussing it further is pointless. Tony On Jun 16, 2022, at 7:32 PM, Zafar Ali (zali) <zali@cisco.com<mailto:zali@cisco.com>> wrote: Tony, Kireeti, So "I do not want to modify my current implementation" is the argument to stop people interested in Bruno's draft from using it? If such HW can/ need be modified to implement the new complex encoding scheme you proposed, why it cannot implement simple encoding in Bruno's draft? Please also look at https://datatracker.ietf.org/doc/html/draft-decraene-mpls-slid-encoded-entropy-label-id-04#section-4.4 and https://datatracker.ietf.org/doc/html/draft-decraene-mpls-slid-encoded-entropy-label-id-04#section-4.5 Thanks Regards ... Zafar From: Tony Li <tony1athome@gmail.com<mailto:tony1athome@gmail.com>> on behalf of Tony Li <tony.li@tony.li<mailto:tony.li@tony.li>> Date: Thursday, June 16, 2022 at 3:10 PM To: "Zafar Ali (zali)" <zali@cisco.com<mailto:zali@cisco.com>> Cc: Kireeti Kompella <kireeti.ietf@gmail.com<mailto:kireeti.ietf@gmail.com>>, "bruno.decraene@orange.com<mailto:bruno.decraene@orange.com>" <bruno.decraene@orange.com<mailto:bruno.decraene@orange.com>>, "mpls@ietf.org<mailto:mpls@ietf.org>" <mpls@ietf.org<mailto:mpls@ietf.org>>, "pals-chairs@ietf.org<mailto:pals-chairs@ietf.org>" <pals-chairs@ietf.org<mailto:pals-chairs@ietf.org>>, "mpls-chairs@ietf.org<mailto:mpls-chairs@ietf.org>" <mpls-chairs@ietf.org<mailto:mpls-chairs@ietf.org>>, DetNet Chairs <detnet-chairs@ietf.org<mailto:detnet-chairs@ietf.org>> Subject: Re: [mpls] Poll 2: New SPL vs re-purposed ELI for carrying Network Action Indicators The draft has been implemented for the exact (SLID) use-case on hardware platforms based on Broadcom Jericho2 family of ASIC Please take a look at https://datatracker.ietf.org/doc/html/draft-decraene-mpls-slid-encoded-entropy-label-id-04#section-7 No such issue was noted And Jericho2 is the only thing that counts in the entire world? 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- Re: [mpls] Poll 2: New SPL vs re-purposed ELI for… Tianran Zhou
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- Re: [mpls] Poll 2: New SPL vs re-purposed ELI for… Robert Raszuk
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- Re: [mpls] Poll 2: New SPL vs re-purposed ELI for… Greg Mirsky
- Re: [mpls] Poll 2: New SPL vs re-purposed ELI for… Robert Raszuk
- Re: [mpls] Poll 2: New SPL vs re-purposed ELI for… Greg Mirsky
- Re: [mpls] Poll 2: New SPL vs re-purposed ELI for… Robert Raszuk
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- Re: [mpls] Poll 2: New SPL vs re-purposed ELI for… bruno.decraene
- Re: [mpls] Poll 2: New SPL vs re-purposed ELI for… Greg Mirsky
- Re: [mpls] Poll 2: New SPL vs re-purposed ELI for… bruno.decraene