[c-nsp] 7600 Rate Limiting Output

[Rob Shakir]

On 24 Jan 2010, at 03:46, Kevin Warwashana wrote:
> 
> int gig4/0/0.8
> 
> service-policy output 26MB-OUTPUT    
> 
> Police and strict priority must be configured together for egress QOS.
> 
> Invalid feature combination for the class class-default
> 
> Configuration failed

This looks like what you see on ES-20 when trying a similar configuration. It implies that one must configure an LLQ to be able to police. Therefore to achieve this, you can do:

policy-map POLICY-POLICE-26MBPS-OUT
 class class-default
  police cir 26000000 conform-action transmit exceed-action drop
  ! forced to be an llq
  priority
 !
!

However, interestingly, the configuration that you supplied appears to be configurable on SIP-400 w/ SPA-2x1GE:

7600#sh policy-map RJS-TEST

  Policy Map RJS-TEST
    Class class-default
     police rate 26000000 bps
       conform-action transmit
       exceed-action drop

7600#sh run int giga1/0/0.4011
Building configuration...

Current configuration : 239 bytes
!
interface GigabitEthernet1/0/0.4011
 encapsulation dot1Q 4011
 ip address 192.168.88.42 255.255.255.0
 ip vrf forwarding RJS-TEST
 service-policy input POLICY-SET-IP-DSCP-DEFAULT
 service-policy output RJS-TEST
end

This may be due to the fact that the datasheet for SIP-400 [0] says that it supports "egress queueing", whereas SIP-600 [1] states only "egress shaping". If you don't have inter-op requirements, can you configure it as a shaper with a very short queue length, so that you start to emulate policing?

Alternatively, it might be worth checking whether you can configure a shaper at class-default, with an attached service-policy that can then police under this.

Hope this helps!

Kind regards,
Rob

[0]: http://www.cisco.com/en/US/prod/collateral/routers/ps368/product_data_sheet0900aecd8027c9e6.html
[1]: http://www.cisco.com/en/US/prod/collateral/routers/ps368/product_data_sheet0900aecd8033998f_ps708_Products_Data_Sheet.html


-- 
Rob Shakir                      <rjs at eng.gxn.net>
Network Development Engineer    GX Networks/Vialtus Solutions
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