QoS minimum requirements
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01-12-2023 07:57 AM
Hello,
I would like if having a 50 mb bandwidth will be a best practices to apply QoS.
Thanks.
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01-12-2023 08:18 AM
First you have to analyse and classify the applications that are running in your network. If you don't have that or you can't do that, one of the golden rules of QoS is that no QoS is often better than wrong QoS.
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01-12-2023 09:24 AM
I already know all the apps that are running, what I would like to know if having a 50mb bandwidth will be worth it to do a QoS.
thanks.
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01-12-2023 09:41 AM
Are any of the applications passing over this link sensitive to delay/loss like VoIP or video? Are any of the ones you consider less important consuming enough bandwidth to slow down applications you consider more important? There is no "one size fits all".
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01-12-2023 09:52 AM
The most important think i have is voice and I was not sure if with 50 mb apply a QoS would be a best practices.
thanks
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01-12-2023 10:04 AM
On a 50 MBit link a bursty application can easily saturate the link and impact the voice quality. I would go for a LLQ implementation.
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01-12-2023 11:15 AM
I never applied LLQ but I will check it .
thanks.
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01-12-2023 02:35 PM
BTW, LLQ is a QoS feature found on many Cisco routers. On Cisco switches, PQ would be something similar.
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01-13-2023 09:50 AM
I was reading about the LLQ, and for the Cisco version I have 12.x thanks.
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01-13-2023 02:10 PM
If you have a router, with something like a FE hand-off, to a circuit providing 50 Mbps, you would want something like this:
class-map match-all real-time
match dscp EF !you must somehow match your real-time (e.g. VoIP) traffic
policy-map CBWFQ-example-shaper
class class-default
shape average 42500000 !about 15% less, to allow for average L2 overhead
service-policy CBWFQ-example
policy-map CBWFQ-example
class real-time
priority percent 33 !this is LLQ
class class-default
fair-queue
remaining percent 100
interface ?
service-policy output CBWFQ-example
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01-12-2023 11:10 AM
Actual bandwidth is irrelevant.
What's relevant is whether there's sufficient congestion that's adverse to your traffic's service needs and whether QoS can help.
