Thomas Eklund wrote:
..
>
> But it is very unclear how you use diffserv over an entire domain (some
> people might clame that COPS is a solution - other do not)... Someone might
> ask whats the relationship between DSCP (per traffic trunk, 2^6) and flow
> label (per traffic class, 2^20) etc...
There are several misunderstandings of diffserv here.
There is nothing about "traffic trunks" in the diffserv model. At a stretch,
you can think of a DSCP as labelling a "service class", but formally
it simply labels a "traffic aggregate", i.e. all the traffic that receives
the same QOS treatment on a given hop. However, we *do* assume in the
model that DSCP values are invariant across an entire domain, with the
routers in the domain being centrally configured. That configuration
may be done using COPS, or SNMP, or HTTP, or telnet, or by telefax
for that matter - it's of no importance for this discussion.
DSCP mutability applies at diffserv domain boundaries, which will
typically be ISP/ISP boundaries or customet/ISP boundaries.
As of today, there is *no* defined relationship between DSCP and
Flow Label. But I tend to agree with Jim that defining the Flow Label
as immutable across domain boundaries (as well as being visible
in encrypted packets) has distinct advantages.
Brian
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