[c-nsp] Define MPLS default EXP value?

[Benjamin Lovell]

Ignoring some of the more exotic QoS that can be done on the 7600 CWAN cards, on the 6500/7600 platform you only have two options I am aware of. 1) trust the incoming TOS and it will be mapped to EXP automatically. 2) use service-policy on non-trusted interface to set all EXP values manually. 

-Ben



On Jul 30, 2010, at 10:57 AM, Patrick Abeldt wrote:

> Hi all,
> 
> we're planning to introduce MPLS within our network backbone, among other
> things for QoS purposes. Our current concept is based solely on using EXP
> values for different priority levels (the IP TOS fields need to be left
> unchanged.)
> 
> Aside from applications which require higher-than-normal forwarding
> priorities, we have a small number of traffic flows which we'd like to
> assign a lower-than-normal priority. As far as I can see, this would
> require an EXP value > 0 for standard traffic. More precisely, I'd need to
> set a specific default EXP value for all labels imposed on a MPLS router,
> regardless of interface etc. Are there easy methods to achieve this goal,
> preferably on the global configuration level?
> 
> The only solution I've found so far is to impose that default EXP value
> via a service policy attached to the respective interfaces. But given the
> number of interface configs, this would be extremely cumbersome to manage,
> and additionally it would interfere with existing service policies. I
> think this is definitely not the way to go.
> 
> Any suggestions regarding an alternative design would be also welcome.
> We're using c6500/Sup720/PFC3 devices with IOS version
> s72033-advipservicesk9_wan-mz.122-33.SXI3.
> 
> Thanks for your advice,
> Patrick
> 
> 
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