[c-nsp] Re: Need I config DSCP/ToS to ToS manually on Catalyst6509?

[Joe Shen]

I'm sorry I made a mistake, it should be "mapping
DSCP/ToS to CoS"


Joe
 --- Joe Shen <sj_hznm at yahoo.com.cn> µÄÕýÎÄ£º
> Hi,
> 
>  I found the following decritption at
> http://www.cisco.com/warp/public/105/rtgupdates.html
> 
>    "In addition, with any switching engine, QoS
> supports Ethernet egress port
>    scheduling and congestion avoidance using Layer 2
> CoS values. Thus, crucial
>    IP and non-IP packets must be mapped to a CoS
> value, even if such values are
>    used only internally as part of the data bus
> header. Crucial IP packets have
>    their IP precedence value of 6 mapped to an
> equivalent CoS value of 6. Crucial
>     non-IP packets, including IS-IS packets
> originating from the MSFC, are marked
>     with the pak_priority flag and then such flagged
> packets are mapped to a CoS
>      value of 6. This mapping happens automatically
> in
> current Cisco
>      IOS releases. "
> 
>    To my understanding, this means Catalyst6509
> would
> map DSCP/ToS to
>    CoS automatically if packet are curcial. My
> question is, if QoS
>    classes are defined for customer traffic, should
> I
> config such
>    mapping manually ? If so, is there any
> configuration guide for
>    this?
> 
>
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