topic Re: QoS on Nexus 9K qos-group in Switching

QoS on Nexus 9K qos-group

russjstewart — Fri, 22 Apr 2022 06:12:12 GMT

Apologies for sounding like a complete idiot, but I suspect I am one. Is anyone able to provide any insight on how qos-groups are defined on the N9K.

I am trying to follow how queuing works, and I can get as far as the following ( not all output shown)

SDC-CORE-RB-01# sh policy-map int eth1/1

Global statistics status : enabled

Ethernet1/1

Service-policy (queuing) output: default-8q-out-policy
SNMP Policy Index: 301991314

Class-map (queuing): c-out-8q-q7 (match-any)
priority level 1
queue dropped pkts : 0
queue depth in bytes : 0

SDC-CORE-RB-01# show class-map type queuing c-out-8q-q7

Type queuing class-maps
========================

class-map type queuing match-any c-out-8q-q7
Description: Classifier for Egress queue 7
match qos-group 7

My problem is I cannot find any reference to "qos-group 7" In an IOS-XE world the match command would relate to a ACL or dscp setting or similar.

If anyone could point me in the right direction it would be greatly appreciated

Thanks for time in advance

Re: QoS on Nexus 9K qos-group

Georg Pauwen — Fri, 22 Apr 2022 06:59:40 GMT

Hello,

not sure if this helps a lot (and you might have seen this document before), but it looks like qos group 7 is system-defined in 8q mode.

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/6-x/qos/configuration/guide/b_Cisco_Nexus_9000_Series_NX-OS_Quality_of_Service_Configuration_Guide/b_Cisco_Nexus_9000_Series_NX-OS_Quality_of_Service_Configuration_Guide_chapter_010.html#concept_E572527C49DE4CA6BF1BC1711FA97895

Re: QoS on Nexus 9K qos-group

pman — Fri, 22 Apr 2022 09:39:44 GMT

Hi,
Following what has already been written, try to read the following pages in the attached article, you may find it interesting,

page 18 - 8 Class Queuing Model
page 56 - Life of a Packet in Cloud Scale ASIC
page 58 - Nexus 9000 QoS Configuration Model
page 59 - Ingress QOS / Egress Queuing Policies
page 60 - Putting it all together
page 115 - Classification & Marking: Nexus 9000
page 129 - CoS to Queue Mapping - Nexus 9000
page 130 - Egress Queuing Configuration: Nexus9000

https://www.ciscolive.com/c/dam/r/ciscolive/emea/docs/2019/pdf/BRKDCN-3346.pdf

Re: QoS on Nexus 9K qos-group

russjstewart — Mon, 25 Apr 2022 22:45:48 GMT

Thanks for the replay PMAN, I will review the document today.

Re: QoS on Nexus 9K qos-group

russjstewart — Mon, 25 Apr 2022 22:46:41 GMT

Thanks Georg, i will review today and get back.