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

Nat Kao <lekao@pyxisworks.org> Fri, 13 December 2019 11:42 UTC

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From: Nat Kao <lekao@pyxisworks.org>
Date: Fri, 13 Dec 2019 19:41:48 +0800
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Subject: [spring] Different MSDs for different traffic types on the same headend.
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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.