QoS Problems

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Mar 3rd, 2009
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I try using MQC and CAR into cisco 3725 following


rate-limit output access-group 100 160000 1500 2000 conform-action continue exceed-action drop


but this rule does not work, and i try the follow rule


access-list 100 permit ip any any


class-map match-all classmap1

match access-group 100


policy-map policymap1

class classmap1

shape average 8000


interface FastEthernet0/0

ip address 10.0.0.121 255.255.255.0

service-policy output policymap1


and does not work either, the result is the same with or without QoS


regards

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mikegrous Tue, 03/03/2009 - 15:49
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Your configs look correct. How are you basing that this isnt working? Are your show commands (show policy-map int fa0/0) not showing matched data? What are you trying to accomplish. Shaping and police will do to differnt things. Shaping has buffers policing (rate-limit command) does not.


Also in your rate limit command your burst values are quite low. I think they should be 30000 and 60000

(160000/8)*1.5= 30000

30000x2= 60000


http://www.cisco.com/en/US/docs/ios/qos/command/reference/qos_q1.html#wp1015612


lejoe.thomas Tue, 03/03/2009 - 16:53
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hi Ricardo,


As Michael pointed out, your burst size in CAR (rate-limit) is very low. If the burst size is too low, the achieved rate will be smaller than the configured rate.


Another point is, the equivalent of CAR is MQC police and not shape.


http://www.cisco.com/en/US/tech/tk543/tk545/technologies_q_and_a_item09186a00800cdfab.shtml#policing


HTH


Lejoe

r-barbosa Wed, 03/04/2009 - 08:30
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hi


yes its showing matched data, I using the dynamips emulator, tested with an Cisco ASA rule MQC and i have worked, then i think the problem is the dynamips. thanks


regards.

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