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Community Member

QOS for Policing Ethernet Traffic on Catalyst 3750

Hello!

I am running a Cisco Catalyst 3750 with IOS c3750-ipbase-mz.122-25.SEB4.bin

Since we've deployed these switched on our Metro Ethernet network, we are now needing the capability to police/rate-limit the client's ports.

I've done examples on Cisco's docs about QoS in 3750 but can't seem to get it right.

I have mls qos enabled

QoS is enabled

QoS ip packet dscp rewrite is enabled

I have placed this configurations to try to limit client traffic

class-map match-all ANY

match access-group 1

!

access-list 1 permit any

!

policy-map POLICE-TO-2MB

class ANY

police 2000000 375000 exceed-action drop

I then apply this to the client interface

interface GigabitEthernet1/0/5

description Link to Customer

switchport access vlan 12

service-policy input POLICE-TO-2MB

end

apparently, the client's input traffic, meaning his upload to me is still exceeding 2Mbits, actually it is still at 95Mbits/sec so I am really confused.

Hope you guys could give me some pointers on how to police all type of traffic on this interface.

Thanks!

4 REPLIES
Community Member

Re: QOS for Policing Ethernet Traffic on Catalyst 3750

You can't use input police in normal ports in the 3750.

You need to use de ES ports.

So you can do an VLAN police rate.

Community Member

Re: QOS for Policing Ethernet Traffic on Catalyst 3750

Hi,

Pardon me, but what do you mean by ES ports? I hope you could point me to a documentation about this or probably a simple example. Thank you.

Community Member

Re: QOS for Policing Ethernet Traffic on Catalyst 3750

apply the service policy to interface vlan 12, not the layer 2 switchport interface GigabitEthernet1/0/5.

This should work.

also to ratelimit egress traffic use the srr-queue bandwidth shape command. You can't do a service policy output on the 3550/3750. THere is a hardware limitation.

Community Member

Re: QOS for Policing Ethernet Traffic on Catalyst 3750

An ES port is found on 3750 Metro switches.

If you have the 3750 standard, you will need to aply in the vlan.

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