Dell EMC SmartFabric OS10 User Guide Release 10.5.0

• Configure classes of dot1p and DSCP traffic, and assign them to lossless queues.
• Allocate guaranteed bandwidth to each lossless queue. If another queue does not use its share, an ETS queue can exceed the amount of allocated bandwidth.

ETS is disabled by default on all interfaces.

1. Configure trust maps of dot1p and DSCP values in CONFIGURATION mode. A trust map does not modify ingress values in output flows. Assign a qos-group, traffic class from 0 to 7, to trusted dot1p/DSCP values in TRUST mode. A qos-group number is used only internally to schedule classes of ingress traffic. Enter multiple dot1p and dscp values in a hyphenated range or separated by commas.

   trust dot1p-map dot1p-map-name 
      qos-group {0-7} dot1p {0-7}
      exit
   trust dscp-map dscp-map-name 
      qos-group {0-7} dscp {0-63}
      exit

2. Configure a QoS map with trusted traffic-class (qos-group) to lossless-queue mapping in CONFIGURATION mode. Assign one or more qos-groups, from 0 to 7, to a specified queue in QOS-MAP mode. Enter multiple qos-group values in a hyphenated range or separated by commas. Enter multiple queue qos-group entries, if necessary.

   qos-map traffic-class queue-map-name 
      queue {0-7} qos-group {0-7}
      exit

3. Apply the default trust map specifying that dot1p and dscp values are trusted in SYSTEM-QOS or INTERFACE mode.

   trust-map {dot1p | dscp} default
   

4. Create a queuing class map for each ETS queue in CONFIGURATION mode. Enter match queue criteria in CLASS-MAP mode.

   class—map type queuing class—map-name
      match queue {0-7}
      exit 

5. Create a queuing policy map in CONFIGURATION mode. Enter POLICY-CLASS-MAP mode and configure the percentage of bandwidth that is allocated to each traffic class-queue mapping. The sum of all DWRR-allocated bandwidth across ETS queues must be 100%, not including the strict-priority queue. Otherwise, QoS automatically adjusts bandwidth percentages so that ETS queues always receive 100% bandwidth. The remaining non-ETS queues receive 1% bandwidth each.

   policy—map type queuing policy—map-name
      class class—map-name
         bandwidth percent {1-100} 

   (Optional) To configure a queue as strict-priority, use the priority command. Packets scheduled to a strict priority queue are transmitted before packets in nonpriority queues.

   policy—map type queuing policy—map-name
      class class—map-name
         priority 

6. Apply the trust maps for dot1p and DSCP values, and the traffic class-queue mapping globally on the switch in SYSTEM-QOS mode or on an interface or interface range in INTERFACE mode.

   system qos
      trust-map dot1p dot1p-map-name
      trust-map dscp dscp-map-name
      qos-map traffic-class queue-map-name

   Or

   interface {ethernet node/slot/port[:subport] | range ethernet node/slot/port[:subport]-node/slot/port[:subport]}
      trust-map dot1p dot1p-map-name
      trust-map dscp dscp-map-name
      qos-map traffic-class queue-map-name

7. Apply the qos trust policy to ingress traffic in SYSTEM-QOS or INTERFACE mode.

   service-policy input type qos trust-policy—map-name

8. Apply the queuing policy to egress traffic in SYSTEM-QOS or INTERFACE mode.

   service-policy output type queuing policy—map-name

9. Enable ETS globally in SYSTEM-QOS mode or on an interface/interface range in INTERFACE mode.
   NOTE If you have not enabled PFC on all the interfaces, this configuration at the global level is not required. Enable ETS on the specific interfaces.

   ets mode on

Configure ETS

OS10(config)# trust dot1p-map dot1p_map1
OS10(config-trust-dot1pmap)# qos-group 0 dot1p 0-3
OS10(config-trust-dot1pmap)# qos-group 1 dot1p 4-7
OS10(config-trust-dot1pmap)# exit

OS10(config)# trust dscp-map dscp_map1
OS10(config-trust-dscpmap)# qos-group 0 dscp 0-31
OS10(config-trust-dscpmap)# qos-group 1 dscp 32-63
OS10(config-trust-dscpmap)# exit

OS10(config)# qos-map traffic-class tc-q-map1
OS10(config-qos-tcmap)# queue 0 qos-group 0
OS10(config-qos-tcmap)# queue 1 qos-group 1
OS10(config-qos-tcmap)# exit

OS10(config)# system qos
OS10(config-sys-qos)# trust-map dot1p default


OS10(config)# class-map type queuing c1
OS10(config-cmap-queuing)# match queue 0
OS10(config-cmap-queuing)# exit
OS10(config)# class-map type queuing c2
OS10(config-cmap-queuing)# match queue 1
OS10(config-cmap-queuing)# exit

OS10(config)# policy-map type queuing p1
OS10(config-pmap-queuing)# class c1
OS10(config-pmap-queuing)# bandwidth percent 30
OS10(config-pmap-queuing)# exit
OS10(config)# policy-map type queuing p2
OS10(config-pmap-queuing)# class c2
OS10(config-pmap-queuing)# bandwidth percent 70
OS10(config-pmap-queuing)# exit

OS10(config)# system qos
OS10(config-sys-qos)# trust-map dot1p dot1p_map1
OS10(config-sys-qos)# trust-map dscp dscp_map1
OS10(config-sys-qos)# qos-map traffic-class tc-q-map1
OS10(config-sys-qos)# ets mode on
OS10(config-sys-qos)# service-policy output type queuing p1

View ETS configuration

OS10# show qos interface ethernet 1/1/1
Interface
unknown-unicast-storm-control : Disabled
multicast-storm-control : Disabled
broadcast-storm-control : Disabled
flow-control-rx : Disabled
flow-control-tx : Disabled
ets mode : Disabled
Dot1p-tc-mapping : dot1p_map1
Dscp-tc-mapping : dscp_map1
tc-queue-mapping : tc-q-map1

View QoS maps: traffic-class to queue mapping

OS10# show qos maps
Traffic-Class to Queue Map: tc-q-map1
      queue 0 qos-group 0
      queue 1 qos-group 1
Traffic-Class to Queue Map: dot1p_map1
      qos-group 0 dot1p 0-3
      qos-group 1 dot1p 4-7
DSCP Priority to Traffic-Class Map  : dscp_map1
      qos-group 0 dscp 0-31
      qos-group 1 dscp 32-63