Re: Puzzling QoS Issue

Hi Joe

What code are you running, the G2 ISR's are synonymous for having high CPU issues check the sh processes CPU whilst you have the policy applied...baseline google change code re-test

We have some based in another part of the world as regularly the NMS picks up >70 CPU util

This is based on different factors to the amount of cef packets being punted, various security and QoS or encryption policies, I brought one for another project and the first thing I ordered with it is the 1G>4G memory upgrade

Also check the size if your routing table

--
BR
Tony
Sent from my iPhone on 3
On 19 Apr 2013, at 22:49, Joe Astorino <joeastorino1982_at_gmail.com> wrote:
> I have a 3945 ISR router connected via a GigabitEthernet link to a service
> provider that is providing 10Mbps WAN access.  I wish to use CBWFQ and the
> service provider requires dot1q tagging.  As such, I must shape my
> sub-interface and use a hierarchical type QoS policy...no big deal
> 
> policy-map WAN-EDGE
> class VOICE
>  priority percent 20
> !
> class VIDEO
>  bandwidth remaining percent 60
>  queue-limit 128 packets
> !
> class APPS_SIGNALING
>  set dscp af21
>  bandwidth remaining percent 30
> !
>  class class-default
>  bandwidth remaining percent 10
> !
> !
> policy-map SHAPE-OUT
> class class-default
>  shape average 10000000
>   service-policy WAN-EDGE
> !
> !
> int gi0/1.2
> encapsulation dot1q 2
> ip address ...
> service-policy output SHAPE-OUT
> 
> 
> Here is the very strange thing.  Even when the TX of this WAN interface is
> barely being used, when and only when the service-policy is applied, the
> response in pings to anything behind this router increase immediately by
> 200-400ms.  Immediately after removing the service-policy things return to
> normal.
> 
> Investigating the output of "show policy-map interface" reveals a large
> number of output drops in the shaper class-default. So far I have tried
> 
> - increasing the queue-limit to many different combinations
> - increasing the burst size
> 
> I also have the exact same configuration on another remote site router
> running the same version of IOS with the same setup (10Mbps Ethernet WAN
> link) on the same platform.
> 
> I'm really baffled as to what would cause this.  Any insight appreciated.
> 
> 
> 
> -- 
> Regards,
> 
> Joe Astorino
> CCIE #24347
> http://astorinonetworks.com
> 
> "He not busy being born is busy dying" - Dylan
> 
> 
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