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New Member

Qos : bandwidth limitation on Ethernet port

I have a router connected via an Ethernet port to 100 duplex Mbps/Full towards an operator limiting the band-width to 4Mbps. How can I make so that my policy-map associated with the Voip treatment is put in function as of the use of the 4Mbps?


Re: Qos : bandwidth limitation on Ethernet port

You should be able to use a policing or shaping policy to limit the BW on an Ethernet port. Policing if the 4Mbps limit is absolute, shaping if some bursting is allowed.


Re: Qos : bandwidth limitation on Ethernet port

Dear Sir,

We can use Policing, or apply rate-limit that matching on DSCP-EF or even ACL

CAR Matches on DSCP EF (Voice)

rate-limit input dscp 46 4000000 750000 1500000 conform-action transmit exceed-

action drop

CAR matches on ACL 101 which matches on the RTP payload port range.

rate-limit input access-group 101 4000000 750000 1500000 conform-action transmi

t exceed-action drop

The above values for 4M traffic.

Best Regards,

Mounir Mohamed

New Member

Re: Qos : bandwidth limitation on Ethernet port


You can you this sample config to limit bandwidth about 4 Mbps and have priority queueing for voip traffic with bandwidth 50% from 4 Mbps.

Example config


class-map match-all voice

match ip dscp ef

policy-map qos-policy

class voice

priority percent 50

class class-default



policy-map fasteth-4mb

class class-default

shape average 4000000

service-policy qos-policy

interface FastEthernet0

service-policy output fasteth-4mb

Of course you can use this policy only in output direction.


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