07-20-2015 12:05 PM - edited 03-03-2019 07:55 AM
Does Switch cisco Catalyst 3750 support CBWFQ QoS?
I would like to understand if the IOS of the catalyst support the Bandwidth command to a class and offer a minimum bandwidth in congestion situation. I have some applications that need to increase its flow when the other classes is not using their bandwidth. On my 3750 I dont see the bandwidth command.
Thanks a lot.
Solved! Go to Solution.
07-22-2015 01:30 AM
Hi you should not have to set mls qos, just use the service policy to apply it but from what i remember there's restrictions on 3750s i dont think you can apply the policy outbound only inbound but it may have changed in newer IOS, i have not tested it recently
This is a good doc on 3750s qos
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/12-2_52_se/configuration/guide/3750scg/swqos.html#wp1766985
07-21-2015 08:22 AM
Yes 3750s support CBWFQ , its not about the hardware more the software thats running on it as its layer 3 software based qos unlike layer 2 which is hardware based qos
07-21-2015 01:02 PM
Hi Mark,
Thank you for response.
So I need to enable the (mls qos) to use the cbwfq or I can to make the follow config without mls qos:
policy-map xxxx
class critical_data
set ip dscp af41
bandwidth percent 50
random-detect dscp-based
random-detect dscp 34 50 105
queue-limit 148 packets
class oam_map
set ip dscp cs2
bandwidth percent 5
class voip_map
priority percent 6
set ip dscp ef
class svoip_map
set ip dscp af31
bandwidth percent 3
class pacs_map
set ip dscp af13
bandwidth percent 20
class class-default
fair-queue
random-detect dscp-based
Thanks
07-21-2015 03:02 PM
Hi Mark,
Thank you for response.
In this case, when I use bandwidth command it´s possible a class use the bandwidth that is not in use for other class. In 3750x I only able to use police that limit my class and if it necessary more bandwidth and other class is not using all its band this class dont increase its band to be using police. Does it make sense Mark? Is it correct?
Thanks.
07-22-2015 01:30 AM
Hi you should not have to set mls qos, just use the service policy to apply it but from what i remember there's restrictions on 3750s i dont think you can apply the policy outbound only inbound but it may have changed in newer IOS, i have not tested it recently
This is a good doc on 3750s qos
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/12-2_52_se/configuration/guide/3750scg/swqos.html#wp1766985
07-24-2015 07:31 AM
Hi thank you, this doc will help me!!
08-08-2016 06:49 AM
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Posting
(A very belated response - but just stumbled across this thread - I believe some response information might not be 100% accurate.)
Yes 3750s support CBWFQ . . .
At least for egress, it is not like software based routers. Feature wise, it's a subset, and its configuration can be quite different.
. . . its not about the hardware more the software thats running on it as its layer 3 software based qos unlike layer 2 which is hardware based qos
3750 QoS is tied to its hardware, especially for egress.
08-09-2016 09:55 AM
Thank you for your response.
Cheers.
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