[c-nsp] QoS on a 6509/720

[Per Carlson]

John Kristoff wrote:
> First, according to this post from Ian a couple of years ago:
> under hybrid and an older version of code, if 'mls qos' is applied
> globally and a port's QoS state is untrusted, packets entering that
> port will have their ToS (DiffServ codepoint) rewritten to the port's
> default (which should typically be CS0 - best effort).  Is that still
> the case with the box I'm running?

That was an issue with Sup2's and an older 12.1E code. To prevent the 
switch from touching the IP ToS, you had to diable all QoS with "no mls 
qos" globally. This "automatically copy L2 CoS to L3 ToS" behaviour can 
be overridden via the "mls qos queueing-only" command available in 
12.1(19)E and later.

I _think_ the same applies to Sup720's and SX-code (at least the 
descriptions of the "mps qos" and "mös qos queueing-only" commands are 
the same as for 12.1E).

-- 
Per




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