07-02-2013 01:48 AM - edited 03-07-2019 02:11 PM
We would like to implement Qos based on CBWFQ.
Does a 3750 with a ip base license (c3750x-24t-s) this?
Thanks in advance for your answers.
07-02-2013 02:11 AM
According to this its not supported yet.
CBWFQ on this which is unfortunately _not_ supported on this platform irrespective of the IOS being used. So in essence, there is no way to configure a policy-map with the priority nor bandwidth commands. You can configure one ingress queue as the priority queue by using the mls qos srr-queue input priority-queuebandwidth global configuration command. The priority queue should be used for traffic (such as voice) that requires guaranteed delivery because this queue is guaranteed part of the bandwidth regardless of the load. SRR services the priority queue for its configured weight as specified by the bandwidth keyword in the mls qos srr-queue input priority-queue bandwidth global configuration command. Then, SRR shares the remaining bandwidth with both ingress queues and services them as specified by the weights configured with the mls qos srr-queue input bandwidth global configuration command. Each port supports four egress queues, one of which (queue 1) can be the egress expedite queue. These queues are assigned to a queue-set. All traffic exiting the switch flows through one of these four queues and is subjected to a threshold based on the QoS label assigned to the packet. Only queuing and scheduling can be done on the egress which will not give you the same results as policing. Please do go through the configuration guide outlining the QoS capabilities of this platform: http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/1 2.2_44_se/configuration/guide/swqos.html Please feel free to contact me in case you have any further queries.
HTH
Regards
Inayath
07-02-2013 02:22 AM
When you have a look to this site:
You should think it is available. But only the needed license is not described.
07-02-2013 02:27 AM
Danny,
I do not believe CBWFQ will ever be supported on the Catalyst 3750 platform. The CBWFQ is such a fancy queueing algorithm with so many degrees of freedom that it is outspokenly difficult to implement it in hardware (as every significant packet operation has to be implemented in hardware on multilayer switches). The 3750 platform does not currently have such hardware built in so CBWFQ can not come just with an IOS upgrade, and I doubt such hardware will ever be built into the Cat3750. To my best knowledge, CBWFQ was only available on high-end switch, such as Cat6500, on selected line cards.
Your link points to a documentation that explains the use of Modular QoS CLI, or MQC, to configure selected QoS features. However, that does not mean that CBWFQ is the mechanism behind the queueing. The Cat3750 supports SRR (Shaped/Shared Round Robin) only and you currently can not get any better.
Best regards,
Peter
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