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Re: [spring] Different MSDs for different traffic types on the same headend.

Jeff Tantsura <jefftant.ietf@gmail.com> Fri, 13 December 2019 18:42 UTC

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Date: Fri, 13 Dec 2019 10:42:33 -0800
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: spring@ietf.org, Nat Kao <lekao@pyxisworks.org>
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Subject: Re: [spring] Different MSDs for different traffic types on the same headend.
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Hi Nat,

Please read https://tools.ietf.org/html/rfc8491#section-5
Currently defined MSD types are:
1: BMI
2: ERLD

Specifically to BMI:
Base MPLS Imposition MSD (BMI-MSD) signals the total number of MPLS labels that can be imposed, including all service/transport/special labels.
The answer to your question is 6

Cheers,
Jeff
On Dec 13, 2019, 3:42 AM -0800, Nat Kao <lekao@pyxisworks.org>, wrote:
> Hello, SPRING WG.
>
> How do we deal with an SR-TE policy headend with different MSDs for different types of traffic?
> For example, a headend H can impose:
> 6 transport labels for plain IPv4 packets;
> 5 transport labels + 1 IPv6 ExpNull label for plain IPv6 packets;
> 3 transport labels + 3 VPN  labels for VPN packets.
>
> a) For a plain IPv4 route R4 and a VPN route Rv both steered into the SR-TE policy P1 with SID list <S1, S2, S3, S4, S5>, what will H perform in this situation?
> b) What is the MSD of H? 6, 5 or 3?
>
> Thanks,
> Nat.
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