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Webcast-Catalyst9k
New Member

Default Configuration Lines on Nexus 5000

What is the purpose of these default configuration lines? What do they mean? I can't find an explanation of them anywhere. I believe some are written to the config when FCoE is enabled....

I would like to know exactly what they are doing.

class-map type qos class-fcoe

class-map type queuing class-fcoe

  match qos-group 1

class-map type queuing class-all-flood

  match qos-group 2

class-map type queuing class-ip-multicast

  match qos-group 2

class-map type network-qos class-fcoe

  match qos-group 1

class-map type network-qos class-all-flood

  match qos-group 2

class-map type network-qos class-ip-multicast

  match qos-group 2

system qos

  service-policy type qos input fcoe-default-in-policy

  service-policy type queuing input fcoe-default-in-policy

  service-policy type queuing output fcoe-default-out-policy

  service-policy type network-qos fcoe-default-nq-policy

5 REPLIES
VIP Super Bronze

Default Configuration Lines on Nexus 5000

If you move this to the server sub-forum, Lucien Avramov can probably provided you good feedback.  He is the expert and the TME for the 5K series. 

Reza

New Member

Default Configuration Lines on Nexus 5000

Hi, Reza. I'll take your advice.

Cisco Employee

Re: Default Configuration Lines on Nexus 5000

This is default QoS config on n5k devices.

It maps certain qous-groups to different types of traffic and allows you quickly change QoS  configuration for these qos-groups to reflect your network needs.

These lines can be easily replaced with your own config.

Here is a qos config guide for n5k

http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/configuration/guide/cli/QoS.html

HTH,

Alex

New Member

Default Configuration Lines on Nexus 5000

HI, this link does not explain everything....it does not address the class-map type qos...type queing...type network commands....I wish someone can authoritatively tell me what each one of those lines is doing - line by line.

Thanks

Cisco Employee

Default Configuration Lines on Nexus 5000

Here is more detailed link

http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/qos/Cisco_Nexus_5000_Series_NX-OS_Quality_of_Service_Configuration_Guide_chapter3.html#task_1135199

Please read carefuly docimentation on QoS before doing any confguration on the device.

The following predefined policy maps are used as default service policies:

Type network qos policies can only be configured on the system qos attachment point. They are applied to the entire switch for a particular class

Type queuing policies are used for scheduling and buffering the traffic of a specific system class. A type queuing policy is identified by its qos-group and can be attached to the system or to individual interfaces (except for Fabric Extender host interfaces) for input or output traffic.

Type qos policies are used for classifying the traffic of a specific system class identified by a unique qos-group value. A type qos policy can be attached to the system or to individual interfaces (including Fabric Extender host interfaces) for input traffic only.

So following lines matches traffic marked with certain qos-group to system defined class-maps:

!maps traffic with qos group 1 to default class "class-fcoe"

class-map type queuing class-fcoe

  match qos-group 1

!maps traffic with qos group 2 to default class "class-all-flood"

class-map type queuing class-all-flood

  match qos-group 2

class-map type queuing class-ip-multicast

  match qos-group 2

class-map type network-qos class-fcoe

  match qos-group 1

class-map type network-qos class-all-flood

  match qos-group 2

class-map type network-qos class-ip-multicast

  match qos-group 2

  system qos   - section where system qos policies are configured - they are applied to all interfaces by default

!lower you can see system policies

!applies qos (marking) policy-map for input - this will affect all interfaces by default

    service-policy type qos input fcoe-default-in-policy

!applies queuing policy on icomming traffic

    service-policy type queuing input fcoe-default-in-policy

!applies queuing policy on outgoint traffic      

    service-policy type queuing output fcoe-default-out-policy

!network qos policy applied to entire switch

    service-policy type network-qos fcoe-default-nq-policy

Basically standart policy structure is

!creating class to which we will map traffic which falls in certain criteria

class map type X CLASS_NAME

!some criteria (ip address, protocol, cos)

match CRITERIA

!creating policy map which will MODIFY some traffic flow characteristics

policy-map type Y POLICY_NAME

!configuring class-map under policy maps meaning that this policy map will apply to all traffic matched by thic class-map

class CLASS_NAME

!applying changes

bandwidth ...

etc..

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