Traffic Prioritization on a Cisco 2621XM Router

Unanswered Question
Jun 4th, 2003

We would like to give greater priority to telnet traffic to our mainframe over a 2MB leased line connection.

All other traffic is to be treated as low priority.

What would be the best way of achieveing this on a Cisco 2621XM router?

Could you kindly provide a sample config.

Thanks in advance for your help.

I have this problem too.
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thisisshanky Wed, 06/04/2003 - 07:27

Upto 2MB connections, the default queueing is WFQ, which is weighted fair queueing, which gives higher weights to interactive traffic such as telnet. compared to bandwidth hogging apps such as a file transfer, ftp session.

Give a show queue serial 0 and you should get the queueing strategy thats currently enabled on the interface. It should be written weighted fair for WFQ.

If you additionally want, high priority for telnet and low for everything else, you can use priority queueing.

Key in the following commands.

priority-list 1 protocol ip high tcp telnet

int s0

priority-group 1

The above commands create a priority list of protocols, with telnet traffic in the high queue, while the rest by default goes to normal queue.

and priority-group 1 command attaches this priority list to the physical interface.

If you want to make it more granular by specifying ip addresses of end points, you can use the "list " parameter for the priority-list, and create an access list matching the telnet traffic specific to either host.

HTH

svelayud Thu, 06/05/2003 - 11:55

Are these circuits frame-relay , ATM etc...

either way you could do LLQ or CBWFQ .

CBWFQ over Frame http://www.cisco.com/warp/customer/125/cbwfq_17920.html

LLQ over Frame

http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121newft/121t/121t2/dtfrpqfq.htm

CBWFQ over ATM

http://www.cisco.com/warp/customer/121/atm_cbwfq.html

Thanks

suresh

ayaz.akhtar@t-s... Thu, 06/05/2003 - 15:38

These are 2MB Leased Lines.

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Posted June 4, 2003 at 7:09 AM
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