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need more granular than 10/100 for 3550 switchport

Want to traffic-shape at the edge (using a 3550 EMI) on the switchport (not layer 3). For example 1 meg, 3meg... circuits. Looking for config examples, tried class-map/policy-map but to no avail.


Re: need more granular than 10/100 for 3550 switchport

Each port on the 3550 has four different output queues. Gigabit ports on 3550 support a queue management mechanism within each queue. Each queue can be configured to use either Weighted Random Early Discard (WRED) or tail drop with two thresholds. The size of each queue can also be tuned (buffer assigned to each queue). With such tuning of the queue you can restrict it to required bandwidth size. The command you can use is:

wrr-queue bandwidth weight1 weight2 weight3 weight4

Also using the police command you can to some extent have a hold on the bandwidth of the queues in the switch ports.

police 1000000 8000 exceed-action policed-dscp-transmit

Check out the following documents for more information:

QoS Scheduling and Queueing on the Catalyst 3550 Switches

Understanding QoS Policing and Marking on the Catalyst 3550

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