[c-nsp] Cisco 3400 port shaping message limitation

[Ivan Gasparik]

Hi,

There are different shape rates supported if service-policy attached 
to a port operating at different physical speed. I assume that ports  
of your switch don't operate at the same speed.

Ivan


On Wednesday 07 October 2009, Pavel Skovajsa wrote:
> Hello all,
>
> I was in the middle of the configuration of ME-3400-24TS-A
> (12.2(50)SE1) for port-shaping and run into interesting message:
>
> censw(config-if)#!
> censw(config-if)#!
> censw(config-if)#interface FastEthernet0/12
> censw(config-if)#service-policy output UNI-out-internet-1024kbps
> censw(config-if)#service-policy input UNI-in-internet-1024kbps
> censw(config-if)#!
> censw(config-if)#!
> censw(config-if)#interface FastEthernet0/22
> censw(config-if)#service-policy output UNI-out-internet-1024kbps
> censw(config-if)#service-policy input UNI-in-internet-1024kbps
> censw(config-if)#!
> censw(config-if)#!
> censw(config-if)#interface FastEthernet0/5
> censw(config-if)#service-policy output UNI-out-internet-1024kbps
> QoS: Configuration failed.  The configured rate 1024000 bps is not
> achievable in hw within 1% of configuration.
>         Closest value(s) are: 1111111 bps, 1000000 bps
> censw(config-if)#service-policy input UNI-in-internet-1024kbps
> censw(config-if)#
> censw(config-if)#service-policy output UNI-out-internet-1024kbps
> QoS: Configuration failed.  The configured rate 1024000 bps is not
> achievable in hw within 1% of configuration.
>         Closest value(s) are: 1111111 bps, 1000000 bps
> censw(config-if)#service-policy output UNI-out-internet-1024kbps
> QoS: Configuration failed.  The configured rate 1024000 bps is not
> achievable in hw within 1% of configuration.
>         Closest value(s) are: 1111111 bps, 1000000 bps
>
>
> The configuration of the policy-map is straightforward:
> policy-map UNI-out-internet-1024kbps
>  class class-default
>     shape average 1024000
>     queue-limit 272
>
> The setting of the queue-limit is configured according to the
> recommendation over here:
> http://www.cisco.com/en/US/docs/switches/metro/me3400/software/rele
>ase/12.2_52_se/configuration/guide/swqos.html#wp1497063
>
> After little experimenting I figured out that when I change the
> policy-map to this:
> policy-map UNI-out-internet-1024kbps
>  class class-default
>     shape average 1000000
>     queue-limit 272
>
> It starts to work fine. The question still remains, what does this
> error message actually mean, and why it got triggered when I
> applied the policy to the 3rd interface in a row....
>
> Can somebody shed some light into this?
>
> Regards,
> Pavel Skovajsa
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