[c-nsp] Needs some help with QOS

[John Lange]

On Tue, 2009-03-24 at 13:29 +0100, BALLA Attila wrote:
> Hi,
> 
>    you should use hierarchical QoS. First of all you should shape the 
> output traffic down to the upstream speed, then you can use the llq inside 
> the shaped class:
> http://www.cisco.com/en/US/tech/tk543/tk545/technologies_tech_note09186a00800b2d29.shtml
> 

I followed the examples on that page but I'm not having any luck. As far
as I can tell the queue is dropping at least some packets that it should
be prioritizing (look for 582 below).

First, here is what i have in my config, and below that is the results
of "show policy-map interface". As a side question, the file copy now
seems to work much differently in that it does a big "burst" at the
start of the copy and then "stalls". Is this a burst while the packet
queue fills up?

--- config ---

class-map match-all cm-qos1
 match access-group name al-qos1

policy-map parent_shaping
 class class-default
  shape average 128000
  service-policy child_queueing

policy-map child_queueing
 class cm-qos1
  priority percent 70

interface FastEthernet4
 service-policy output parent_shaping

ip access-list extended al-qos1
 permit ip host xxx.xxx.xxx.xxx any
 permit ip any host xxx.xxx.xxx.xxx

----========-----

l#show policy-map interface 
 FastEthernet4 

Service-policy output: parent_shaping

 Class-map: class-default (match-any)
  157430 packets, 69675635 bytes
  5 minute offered rate 150000 bps, drop rate 25000 bps
  Match: any 
  Queueing
  queue limit 64 packets
  (queue depth/total drops/no-buffer drops) 47/618/0
  (pkts output/bytes output) 15633/18270484
  shape (average) cir 128000, bc 512, be 512
  target shape rate 128000

   Service-policy : child_queueing

    queue stats for all priority classes:
     Queueing
     queue limit 64 packets
     (queue depth/total drops/no-buffer drops) 0/582/0
     (pkts output/bytes output) 3228/2120973

     Class-map: cm-qos1 (match-all)
      3810 packets, 2978841 bytes
      5 minute offered rate 71000 bps, drop rate 25000 bps
      Match: access-group name al-qos1
      Priority: 70% (89 kbps), burst bytes 2200, b/w exceed drops: 582
          

     Class-map: class-default (match-any)
      12441 packets, 16201283 bytes
      5 minute offered rate 69000 bps, drop rate 0 bps
      Match: any 
          
      queue limit 64 packets
      (queue depth/total drops/no-buffer drops) 46/36/0
      (pkts output/bytes output) 12405/16149511


- 
John Lange
http://www.johnlange.ca