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Internet Traffic differentiation

On my Internet Router, i wanted a configuration where the IMAP & SMTP should have 50% as Top Priority,HTTP 25%,FTP & others 25% should hav at the last priority, i think class-map will do this, since i dunnu much about that configuration, tell me how to do this on my router Csco 1750.


Re: Internet Traffic differentiation


To have a simple config

1.Create Access-list to match the required traffic ( one access-list for one group )

2.Configure class-maps

eg .class-map match-any Mail

match access-group mail

mail is the access-list configured to match the imap and smtp traffic

3.Configure a policy-map and call the class-map to it

eg .policy-map QOS

class Mail

priority percent 50 (or )

priority bandwidth

class ftp

bandwidth percent 25

class default

4.Apply the service policy in the outbound direction of your wan link

int s0

service-policy QOS out

Use it as ref:

Hope this helps


vanesh k

Re: Internet Traffic differentiation

thanks for the reply. but once after doing this configuration, by downloading the ftp file,with this configuration i shud get 1ly 25% of the download for ftp, isn't? will deply this on monday & will let you, since tomorrow i won't be available in office, i will reply on monday.

Re: Internet Traffic differentiation


If your first queue uses 50% and second uses 25% , then your third class ie ftp would get the 25% bandwidth , but if other queues are free , then ftp can use 100% of the bw also.

Try out and let us know the results


vanesh k

Re: Internet Traffic differentiation

thanks vanesh,

i was assumed that even though there is no http flow, i thought ftp will be having only 25%, but is nice that it will utilize the 100% bandwidth if non of the traffic flow is happening & also i hope it will resume back to 25% once the http & smtp/imap traffic started flowing. sure will try this on monday & will let you know. thanks for the information.

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