How does CBWFQ determine the minimum allowed bandwidht in class

[Marlon Malinao]

Hi All,

im currently configuring CBWFQ with LLQ on my 6509 POS interface, but i recived this following errors; im not sure if this is related to POS interface specific limitations

6509(config-pmap-c)#class qos-streaming-video
6509(config-pmap-c)#bandwidth 3000
%3000 kbps is less than the minimum allowed of 9756 kbps on POS9/1
6509(config-pmap-c)#bandwidth 5000
%5000 kbps is less than the minimum allowed of 9756 kbps on POS9/1
6509(config-pmap-c)#class qos-scavenger
6509(config-pmap-c)#bandwidth 5000
%5000 kbps is less than the minimum allowed of 9756 kbps on POS9/1
6509(config-pmap-c)#bandwidth 7500
%7500 kbps is less than the minimum allowed of 9756 kbps on POS9/1
6509(config-pmap-c)#class qos-routing
(config-pmap-c)#bandwidth 7500
%7500 kbps is less than the minimum allowed of 9756 kbps on POS9/1

configuration

policy-map qos-wan
  class qos-voice
    priority 43600
class qos-callcontrol
    bandwidth 7500
class qos-routing
  bandwidth 7500
  class qos-buscrit
    bandwidth 2209800
    queue-limit 2048
random-detect dscp-based
class qos-transactional
  bandwidth 5253
   random-detect dscp-based
class qos-netmgmt
  bandwidth 5000
class qos-scavenger
  bandwidth 5000
  class qos-bulkdata
    bandwidth 15000
  random-detect dscp-based
class qos-streaming-video
  bandwidth 3000
  class qos-interactive-video                                                       
    bandwidth 30000
  class class-default
    bandwidth 128000

!

interface POS9/1
description 2.5Gbps ckt
mtu 1600
bandwidth 2500000
ip address xxx.xxx.xxx.xxx
service-policy output qos-wan
end

[Mahesh Gohil]

Hi,

Can you paste config for class-map and also needed platform/ios and linecard type used for this pos interface.

this is like few ethernet interface (specially on 2+4 Ge-wan card inerfaces) allowed minimum of 256k bw in out direction for precedence 1 classes.

Regards

Mahesh

[Marlon Malinao]

Hi Mahesh,

thanks for the reply,  here is the information you need, the line has a 2.5 Gbps bandwidth.

(s72033_rp-ADVENTERPRISEK9_WAN-M), Version 12.2(18)SXF13a, RELEASE SOFTWARE (fc1)

1-port OC-48c POS SI+ (OSM-1OC48-POS-SI+)

cisco WS-C6509-E

class-map match-any qos-callcontrol
  match ip dscp cs3
class-map match-all qos-buscrit
  match ip dscp af31
class-map match-any qos-transactional
  match ip dscp af21
class-map match-any qos-netmgmt
  match ip dscp cs2
class-map match-any qos-voice
  match ip dscp ef
class-map match-any qos-routing
  match ip dscp cs6  cs7
class-map match-any qos-scavenger
  match ip dscp cs1
class-map match-all qos-bulkdata
  match ip dscp af11
class-map match-any qos-streaming-video
  match ip dscp cs4
class-map match-all qos-interactive-video
  match ip dscp af41

thanks,

marlon

[Mahesh Gohil]

Hi marlon,

I have found that shaping and priority have limitation of minimum of 9756 kb on oc48 optical service module card. But somehow it is not documented

anywhere of bandwidth command .

But I am sure this is due to limitation of optical service module.

Please see below for clarity

Physical Interface	Minimum rate for shape average command (bps)
T3 and below	256,000
OC3 POS	607,000
Enhanced OC3 POS	256,000
OC12 POS	2,439,000
Enhanced OC12 POS	256,000
OC48 POS	9,756,000
GE WAN	1,000,000
Enhanced GE WAN	256,000
hierarchical traffic shaping (parent)	1,000,000
hierarchical traffic shaping (child)	Greater of (a) 256,000 bps or (b) 1/255 of the parent rate

It is well if you ask cisco tac for this issue.

Regards

Mahesh

[Marlon Malinao]

Hi Mahesh,

thanks for the reply, may i know when did you get the table?  i will check with TAC to confirm this.

Regards,

Marlon

[Mahesh Gohil · Accepted solution]

Here it is

http://www.cisco.com/en/US/docs/routers/7600/install_config/12.2SR_OSM_config/qos.html

Regards

Mahesh

[Marlon Malinao]

Hi Mahesh,

Thanks!!.

regards,

marlon