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Dell SmartFabric OS10 User Guide Release 10.5.3

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Example 1: Traffic classification and bandwidth allocation in VXLAN topology using CoS value

This example describes how to configure QoS in a VXLAN topology using the Class of Service (CoS) values.

In this example:

  • The interfaces between the leaf switches and the hosts are VLAN-tagged interfaces.
  • The interfaces between the leaf switches and the spine nodes are VLAN-tagged interfaces.
  • VLAN-tagged interfaces use the CoS value to classify the traffic, allocate appropriate egress queue, and bandwidth. In this example, traffic with a CoS value of 3 is assigned to queue 3.
  • Trust dot1p configuration is used on leaf and spine switches. This configuration maps dot1p priority (CoS) value of 3 to queue 3. OS10 by default maps all other traffic to queue 0.
  • Queue 3 is allocated 65% bandwidth. Traffic with CoS value of 3 gets 65% bandwidth. If there is congestion at the egress port, this traffic gets additional bandwidth thus avoiding traffic loss. Traffic with other CoS values gets the remaining bandwidth per the default settings.
  • The trust dot1p and queuing configurations are applied at the system-qos level to simplify the configuration and also to apply the QoS configurations globally.
qos-configuration-in-vxlan-dot1p
NOTE: For Underlay, Overlay VXLAN configuration, see the VXLAN chapter. The network ports and access ports must be VLAN-tagged interfaces for QoS settings to be applied based on dot1p priority.

S1 Switch

  1. Configure trust map with different dot1p priority values mapped to different traffic classes (queues). 
    OS10# configure terminal
OS10(config)# trust dot1p-map TRUST_DOT1P_MAP
OS10(config-tmap-dot1p-map)# qos-group 0 dot1p 0
OS10(config-tmap-dot1p-map)# qos-group 3 dot1p 3
OS10(config-tmap-dot1p-map)# end
  2. Configure queuing at egress with bandwidth allocation of 65% for queue 3. 
    OS10# configure terminal
OS10(config)# class-map type queuing CM_QUEUING_Q3
OS10(config-cmap-queuing)# match queue 3 
OS10(config-cmap-queuing)# exit
OS10(config)# policy-map type queuing PM_QUEUING
OS10(config-pmap-queuing)# class CM_QUEUING_Q3
OS10(config-pmap-c-que)# bandwidth percent 65
OS10(config-pmap-c-que)# end
  3. Apply the dot1p trust map and queuing configuration at the system-qos level (global configuration). 
    OS10# configure terminal
OS10(config)# system qos
OS10(config-sys-qos)# trust-map dot1p TRUST_DOT1P_MAP
OS10(config-sys-qos)# service-policy output type queuing PM_QUEUING
OS10(config-sys-qos)# end

S2 Switch

  1. Configure trust map with different dot1p priority values mapped to different traffic classes (queues). 
    OS10# configure terminal
OS10(config)# trust dot1p-map TRUST_DOT1P_MAP
OS10(config-tmap-dot1p-map)# qos-group 0 dot1p 0
OS10(config-tmap-dot1p-map)# qos-group 3 dot1p 3
OS10(config-tmap-dot1p-map)# end
  2. Configure queuing at egress with bandwidth allocation of 65% for queue 3. 
    OS10# configure terminal
OS10(config)# class-map type queuing CM_QUEUING_Q3
OS10(config-cmap-queuing)# match queue 3 
OS10(config-cmap-queuing)# exit
OS10(config)# policy-map type queuing PM_QUEUING
OS10(config-pmap-queuing)# class CM_QUEUING_Q3
OS10(config-pmap-c-que)# bandwidth percent 65
OS10(config-pmap-c-que)# end
  3. Apply the dot1p trust map and queuing configuration at the system-qos level (global configuration). 
    OS10# configure terminal
OS10(config)# system qos
OS10(config-sys-qos)# trust-map dot1p TRUST_DOT1P_MAP
OS10(config-sys-qos)# service-policy output type queuing PM_QUEUING
OS10(config-sys-qos)# end

L1 Switch

  1. Configure trust map with different dot1p priority values mapped to different traffic classes (queues). 
    OS10# configure terminal
OS10(config)# trust dot1p-map TRUST_DOT1P_MAP
OS10(config-tmap-dot1p-map)# qos-group 0 dot1p 0
OS10(config-tmap-dot1p-map)# qos-group 3 dot1p 3
OS10(config-tmap-dot1p-map)# end
  2. Configure queuing at egress with bandwidth allocation of 65% for queue 3. 
    OS10# configure terminal
OS10(config)# class-map type queuing CM_QUEUING_Q3
OS10(config-cmap-queuing)# match queue 3 
OS10(config-cmap-queuing)# exit
OS10(config)# policy-map type queuing PM_QUEUING
OS10(config-pmap-queuing)# class CM_QUEUING_Q3
OS10(config-pmap-c-que)# bandwidth percent 65
OS10(config-pmap-c-que)# end
  3. Apply the dot1p trust map and queuing configuration at the system-qos level (global configuration). 
    OS10# configure terminal
OS10(config)# system qos
OS10(config-sys-qos)# trust-map dot1p TRUST_DOT1P_MAP
OS10(config-sys-qos)# service-policy output type queuing PM_QUEUING
OS10(config-sys-qos)# end

L2 Switch

  1. Configure trust map with different dot1p priority values mapped to different traffic classes (queues). 
    OS10# configure terminal
OS10(config)# trust dot1p-map TRUST_DOT1P_MAP
OS10(config-tmap-dot1p-map)# qos-group 0 dot1p 0
OS10(config-tmap-dot1p-map)# qos-group 3 dot1p 3
OS10(config-tmap-dot1p-map)# end
  2. Configure queuing at egress with bandwidth allocation of 65% for queue 3. 
    OS10# configure terminal
OS10(config)# class-map type queuing CM_QUEUING_Q3
OS10(config-cmap-queuing)# match queue 3 
OS10(config-cmap-queuing)# exit
OS10(config)# policy-map type queuing PM_QUEUING
OS10(config-pmap-queuing)# class CM_QUEUING_Q3
OS10(config-pmap-c-que)# bandwidth percent 65
OS10(config-pmap-c-que)# end
  3. Apply the dot1p trust map and queuing configuration at the system-qos level (global configuration). 
    OS10# configure terminal
OS10(config)# system qos
OS10(config-sys-qos)# trust-map dot1p TRUST_DOT1P_MAP
OS10(config-sys-qos)# service-policy output type queuing PM_QUEUING
OS10(config-sys-qos)# end

L3 Switch

  1. Configure trust map with different dot1p priority values mapped to different traffic classes (queues). 
    OS10# configure terminal
OS10(config)# trust dot1p-map TRUST_DOT1P_MAP
OS10(config-tmap-dot1p-map)# qos-group 0 dot1p 0
OS10(config-tmap-dot1p-map)# qos-group 3 dot1p 3
OS10(config-tmap-dot1p-map)# end
  2. Configure queuing at egress with bandwidth allocation of 65% for queue 3. 
    OS10# configure terminal
OS10(config)# class-map type queuing CM_QUEUING_Q3
OS10(config-cmap-queuing)# match queue 3 
OS10(config-cmap-queuing)# exit
OS10(config)# policy-map type queuing PM_QUEUING
OS10(config-pmap-queuing)# class CM_QUEUING_Q3
OS10(config-pmap-c-que)# bandwidth percent 65
OS10(config-pmap-c-que)# end
  3. Apply the dot1p trust map and queuing configuration at the system-qos level (global configuration). 
    OS10# configure terminal
OS10(config)# system qos
OS10(config-sys-qos)# trust-map dot1p TRUST_DOT1P_MAP
OS10(config-sys-qos)# service-policy output type queuing PM_QUEUING
OS10(config-sys-qos)# end

L4 Switch

  1. Configure trust map with different dot1p priority values mapped to different traffic classes (queues). 
    OS10# configure terminal
OS10(config)# trust dot1p-map TRUST_DOT1P_MAP
OS10(config-tmap-dot1p-map)# qos-group 0 dot1p 0
OS10(config-tmap-dot1p-map)# qos-group 3 dot1p 3
OS10(config-tmap-dot1p-map)# end
  2. Configure queuing at egress with bandwidth allocation of 65% for queue 3. 
    OS10# configure terminal
OS10(config)# class-map type queuing CM_QUEUING_Q3
OS10(config-cmap-queuing)# match queue 3 
OS10(config-cmap-queuing)# exit
OS10(config)# policy-map type queuing PM_QUEUING
OS10(config-pmap-queuing)# class CM_QUEUING_Q3
OS10(config-pmap-c-que)# bandwidth percent 65
OS10(config-pmap-c-que)# end
  3. Apply the dot1p trust map and queuing configuration at the system-qos level (global configuration). 
    OS10# configure terminal
OS10(config)# system qos
OS10(config-sys-qos)# trust-map dot1p TRUST_DOT1P_MAP
OS10(config-sys-qos)# service-policy output type queuing PM_QUEUING
OS10(config-sys-qos)# end

Verify the configuration

  • Verify trust map configuration. 
    OS10# show qos maps TRUST_DOT1P_MAP
DOT1P Priority to Traffic-Class Map : TRUST_DOT1P_MAP
Traffic-Class    DOT1P Priority
-------------------------------
0                   0                        
1                   1                        
2                   2                        
3                   3                        
4                   4                        
5                   5                        
6                   6                        
7                   7
  • Verify the bandwidth settings. 
    OS10# show queuing weights interface ethernet 1/1/21
Interface ethernet1/1/21
Queue    Weight(In percentage)
--------------------------------
0         5         
1         5         
2         5         
3         65        
4         5         
5         5         
6         5         
7         5
  • Verify that the packets are assigned to the respective queues. Packets with dot1p priority 3 must be assigned to queue 3 and packets with dot1p priority 0 must be assigned to queue 0. Bandwidth allocation of 65% to queue 3 ensures that traffic in queue 3 gets more bandwidth and traffic in other queues get less bandwidth. The drop counter indicates packet drops for queue 0 whereas there are no drops for queue 3 during traffic congestion.

    L1 switch network port (ingress VTEP)

    OS10# show queuing statistics interface ethernet 1/1/21
Interface ethernet1/1/21
Queue Packets   Bytes        Dropped-Packets  Dropped-Bytes            
0     6095735   1865280018   8725959          2233833888               
1     0         0            0                0                        
2     0         0            0                0                        
3     14828189  4537425834   0                0                        
4     0         0            0                0                        
5     0         0            0                0                        
6     0         0            0                0                        
7     0         0            0                0

    L3 switch access port (destination VTEP)

    OS10# show queuing statistics interface ethernet 1/1/1
Interface ethernet1/1/1
Queue Packets    Bytes         Dropped-Packets  Dropped-Bytes            
0     0          0             0                0                        
1     0          0             0                0                        
2     0          0             0                0                        
3     101810039  26063369984   0                0                        
4     0          0             0                0                        
5     0          0             0                0                        
6     0          0             0                0                        
7     0          0             0                0 
    OS10# show queuing statistics interface ethernet 1/1/2
Interface ethernet1/1/2
Queue Packets    Bytes         Dropped-Packets   Dropped-Bytes            
0     46890036   12191361537   0                 0                        
1     0          0             0                 0                        
2     0          0             0                 0                        
3     0          0             0                 0                        
4     0          0             0                 0                        
5     0          0             0                 0                        
6     0          0             0                 0                        
7     0          0             0                 0

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