Alex Conta wrote:
> Let's take an example.
>
> Let's say flow label value 50, is RT traffic between A and B.
>
> C, D, and E are routers between A, and B. Between A, and C, the RT
> traffic to B, has flow
> label 50. At router C, the value of 50 changes to 60, and it
> stays that
> way, to E, where it is changed back from 60 to 50.
>
> Between C and E, the meaning was the same, as between A, and C, and E,
> and B, that is
> the RT traffic between A and B.
>
> The flow label bits were mutable, the meaning was immutable.
And exactly how did C tell E that it would need to remark the packet
to a particular value, or even know that it should do that, or who to
tell? If you are assuming all the routers are all within the same
domain, then yes, you can replace the entire header with 12 if every
exit router knows that 12 means put a header on that exactly matches
the original. The point is that every administrative domain and the
destination will be looking at the same set of bits, not how some
intermediate domain chooses to mangle packets.
Tony
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