On 06/12/2018 00:34, Brian E Carpenter wrote:

.
Of course it still needs to step through them all to do ECMP even if
they are all disabled.
No it doesn't. That's what the flow label, in a fixed position early in the 
IPv6 header, is for. A line speed IPv6 router has no need to look at the layer 
4 header, even if it's doing both diffserv and ECMP. Looking at transport 
headers is an IPv4 concept.



A question for the operators, how widely supported in the flow label?

(a) in native IP
(b) IP over MPLS

Certainly in MPLS and Detnet land I hear about the five or six tuple all the time, including the inspection of them during forwarding, but I don't hear much spoken about the flow label.

- Stewart

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