how to limit the bandwidth on cisco 3550 switch

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May 11th, 2010
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i want to limit the bandwidth for 2mbps (incoming traffic) on cisco 3550 switch for a particular interface. i try configuring Mqos as below but its not working. also srr-queue bandwidth limit  command option is not available in this switch. let me know if there is any other method to limit the bandwidth.

mls qos

ip access-list extended ASHKOM-input
permit ip any any

class-map match-all ASHKOM
  match access-group name ASHKOM-input

policy-map INPUT
  class ASHKOM
    police 2048000 384000 exceed-action drop

interface Fa0/18
service-policy input INPUT

HMG-2ndL3#sh policy-map interface fa0/18


  service-policy input: INPUT

    class-map: ASHKOM (match-all)
      0 packets, 0 bytes
      30 second offered rate 0 bps, drop rate 0 bps
      match: access-group name ASHKOM-inputqm_police_inform_feature: CLASS_SHOW

    class-map: class-default (match-any)
      0 packets, 0 bytes
      30 second offered rate 0 bps, drop rate 0 bps
      match: any
        0 packets, 0 bytes
        30 second rate 0 bps


Hariharan k

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Giuseppe Larosa Tue, 05/11/2010 - 06:54
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Hello Hariharan,

how is it configured the interface fas0/18?

is it a routed port or a switch port?

this kinf of QoS features are available on routers but C3550 looks like missing these features

Hope to help


k.hariharan1 Tue, 05/11/2010 - 22:01
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Hi Giuseppe,

Interface configuration as follows,

HMG-2ndL3#sh run int fa0/18
Building configuration...

Current configuration : 174 bytes
interface FastEthernet0/18
no switchport
ip address 61.x.x.x
load-interval 30
no cdp enable


Hariharan k

epeng Tue, 05/11/2010 - 10:45
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You may try these interface commands:

storm-control unicast level


storm-control broadcast level

k.hariharan1 Wed, 05/12/2010 - 00:27
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i have that option in my switch and i did it. can u please explain me in brief that how that command will work. what will happen for the packets exeeding the limit.

storm-control unicast level 10 10

HMG-2ndL3#sh storm-control unicast
Interface  Filter State   Upper        Lower        Current
---------  -------------  -----------  -----------  -----------
Fa0/1      inactive        100.00%      100.00%       N/A
Fa0/2      inactive        100.00%      100.00%       N/A
Fa0/3      inactive        100.00%      100.00%       N/A

Fa0/17     inactive        100.00%      100.00%       N/A
Fa0/18     Forwarding       10.00%       10.00%        0.06%
Fa0/19     inactive        100.00%      100.00%       N/A


Hariharan k


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