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Dell SmartFabric OS10 User Guide Release 10.5.3

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Example 2: Traffic classification and bandwidth allocation in VXLAN topology using CoS value on access ports and DSCP value on network ports

This example describes how to configure QoS in a VXLAN topology using Class of Service (CoS) value on access ports and DSCP value on network ports.

In this example:

  • The interfaces between the leaf switches and the hosts are VLAN-tagged interfaces.
  • The interfaces between the leaf and the spine switches are L3 interfaces.
  • Traffic from the hosts comes with its respective CoS value. This configuration maps dot1p priority (CoS) value of 3 to queue 3. OS10 by default maps all other traffic to queue 0. At the ingress VTEP, the CoS value is matched and the packet with a CoS value of 3 is marked with a DSCP value of 24 and is assigned to queue 3. The packet from ingress VTEP reaches the spine switch with the modified DSCP value in both the inner and outer IP header.
  • On the spine nodes, the DSCP value is matched and the packet with a DSCP value of 24 is assigned to queue 3.
  • At the egress VTEP, the DSCP value is matched and the packet with a DSCP value of 24 is marked with a CoS value of 3 and assigned to queue 3.
  • The packet reaches the destination with a CoS value of 3.
  • Queue 3 is assigned 65% bandwidth on all nodes. Traffic with a CoS value of 3 or a DSCP value of 24 is given 65% bandwidth. If there is congestion at the egress port, this traffic (queue 3) gets more bandwidth and avoids traffic loss. All other traffic gets the remaining bandwidth per the default settings.
  • Bandwidth allocation is done globally in system-qos mode.
  • Classification and marking are done at the interface level with different settings for access and network ports.
NOTE: On ingress VTEP, the match criteria used in the class map could be based on access-list, VLAN, CoS, or DSCP. On the destination VTEP, the lookup is done based on the inner header fields of the IP header.
qos-configuration-in-vxlan-dscp
NOTE: For Underlay, Overlay VXLAN configuration, see the VXLAN chapter.

L1 Switch

  1. Configure class map and policy map for access port. Traffic with a CoS value of 3 is matched, assigned to qos-group 3, and marked with a DSCP value of 24. 
    OS10(config)# class-map type qos CM_QOS_MATCH_CS3
OS10(config-cmap-qos)# match cos 3
OS10(config-cmap-qos)# exit
OS10(config)# policy-map type qos PM_QOS_ACCESS_PORT
OS10(config-pmap-qos)# !
OS10(config-pmap-qos)# class CM_QOS_MATCH_CS3
OS10(config-pmap-c-qos)# set qos-group 3
OS10(config-pmap-c-qos)# set dscp 24
OS10(config-pmap-c-qos)# exit
OS10(config-pmap-qos)# exit
  2. Configure class map and policy map for the network port. Traffic with a DSCP value of 24 is matched, assigned to qos-group 3, and marked with a CoS value of 3. 
    OS10(config)# class-map type qos CM_QOS_MATCH_DSCP24
OS10(config-cmap-qos)# match ip dscp 24
OS10(config-cmap-qos)# exit
OS10(config)# policy-map type qos PM_QOS_NETWORK_PORT
OS10(config-pmap-qos)# !
OS10(config-pmap-qos)# class CM_QOS_MATCH_DSCP24
OS10(config-pmap-c-qos)# set qos-group 3
OS10(config-pmap-c-qos)# set cos 3
OS10(config-pmap-c-qos)# exit
OS10(config-pmap-qos)# exit
  3. Configure queuing at egress with a bandwidth allocation of 65% for queue 3. 
    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)# !
OS10(config-pmap-queuing)# class CM_QUEUING_Q3
OS10(config-pmap-c-que)# bandwidth percent 65
OS10(config-pmap-c-que)# exit
OS10(config-pmap-queuing)# exit
  4. Configure policy map for the VLTi port. 
    OS10(config)# policy-map type qos PM_QOS_VLTI
OS10(config-pmap-qos)# !
OS10(config-pmap-qos)# class CM_QOS_MATCH_DSCP24
OS10(config-pmap-c-qos)# set qos-group 3
OS10(config-pmap-c-qos)# !
OS10(config-pmap-c-qos)# class CM_QOS_MATCH_CS3
OS10(config-pmap-c-qos)# set qos-group 3
OS10(config-pmap-c-qos)# exit
OS10(config-pmap-qos)# exit
  5. Apply the QoS configuration on the access, network, and VLTi ports. 
    OS10# configure terminal
OS10(config)# interface ethernet 1/1/1
OS10(conf-if-eth1/1/1)# service-policy input type qos PM_QOS_ACCESS_PORT
OS10(config)# interface ethernet 1/1/2
OS10(conf-if-eth1/1/2)# service-policy input type qos PM_QOS_ACCESS_PORT
OS10(config)# interface ethernet 1/1/11
OS10(conf-if-eth1/1/11)# service-policy input type qos PM_QOS_VLTI
OS10(config)# interface ethernet 1/1/21
OS10(conf-if-eth1/1/21)# service-policy input type qos PM_QOS_NETWORK_PORT
OS10(config)# interface ethernet 1/1/22
OS10(conf-if-eth1/1/22)# service-policy input type qos PM_QOS_NETWORK_PORT
  6. Apply the queuing policy map globally in the system-qos mode. 
    OS10(config)# system qos
OS10(config-sys-qos)# service-policy output type queuing PM_QUEUING
OS10(config-sys-qos)# end

L2 Switch

  1. Configure class map and policy map for access port. Traffic with a CoS value of 3 is matched, assigned to qos-group 3, and marked with a DSCP value of 24. 
    OS10(config)# class-map type qos CM_QOS_MATCH_CS3
OS10(config-cmap-qos)# match cos 3
OS10(config-cmap-qos)# exit
OS10(config)# policy-map type qos PM_QOS_ACCESS_PORT
OS10(config-pmap-qos)# !
OS10(config-pmap-qos)# class CM_QOS_MATCH_CS3
OS10(config-pmap-c-qos)# set qos-group 3
OS10(config-pmap-c-qos)# set dscp 24
OS10(config-pmap-c-qos)# exit
OS10(config-pmap-qos)# exit
  2. Configure class map and policy map for the network port. Traffic with a DSCP value of 24 is matched, assigned to qos-group 3, and marked with a CoS value of 3. 
    OS10(config)# class-map type qos CM_QOS_MATCH_DSCP24
OS10(config-cmap-qos)# match ip dscp 24
OS10(config-cmap-qos)# exit
OS10(config)# policy-map type qos PM_QOS_NETWORK_PORT
OS10(config-pmap-qos)# !
OS10(config-pmap-qos)# class CM_QOS_MATCH_DSCP24
OS10(config-pmap-c-qos)# set qos-group 3
OS10(config-pmap-c-qos)# set cos 3
OS10(config-pmap-c-qos)# exit
OS10(config-pmap-qos)# exit
  3. Configure queuing at egress with a bandwidth allocation of 65% for queue 3. 
    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)# !
OS10(config-pmap-queuing)# class CM_QUEUING_Q3
OS10(config-pmap-c-que)# bandwidth percent 65
OS10(config-pmap-c-que)# exit
OS10(config-pmap-queuing)# exit
  4. Configure policy map for the VLTi port. 
    OS10(config)# policy-map type qos PM_QOS_VLTI
OS10(config-pmap-qos)# !
OS10(config-pmap-qos)# class CM_QOS_MATCH_DSCP24
OS10(config-pmap-c-qos)# set qos-group 3
OS10(config-pmap-c-qos)# !
OS10(config-pmap-c-qos)# class CM_QOS_MATCH_CS3
OS10(config-pmap-c-qos)# set qos-group 3
OS10(config-pmap-c-qos)# exit
OS10(config-pmap-qos)# exit
  5. Apply the QoS configuration on the access, network, and VLTi ports. 
    OS10# configure terminal
OS10(config)# interface ethernet 1/1/1
OS10(conf-if-eth1/1/1)# service-policy input type qos PM_QOS_ACCESS_PORT
OS10(config)# interface ethernet 1/1/2
OS10(conf-if-eth1/1/2)# service-policy input type qos PM_QOS_ACCESS_PORT
OS10(config)# interface ethernet 1/1/11
OS10(conf-if-eth1/1/11)# service-policy input type qos PM_QOS_VLTI
OS10(config)# interface ethernet 1/1/21
OS10(conf-if-eth1/1/21)# service-policy input type qos PM_QOS_NETWORK_PORT
OS10(config)# interface ethernet 1/1/22
OS10(conf-if-eth1/1/22)# service-policy input type qos PM_QOS_NETWORK_PORT
  6. Apply the queuing policy map globally in the system-qos mode. 
    OS10(config)# system qos
OS10(config-sys-qos)# service-policy output type queuing PM_QUEUING
OS10(config-sys-qos)# end

L3 Switch

  1. Configure class map and policy map for access port. Traffic with a CoS value of 3 is matched, assigned to qos-group 3, and marked with a DSCP value of 24. 
    OS10(config)# class-map type qos CM_QOS_MATCH_CS3
OS10(config-cmap-qos)# match cos 3
OS10(config-cmap-qos)# exit
OS10(config)# policy-map type qos PM_QOS_ACCESS_PORT
OS10(config-pmap-qos)# !
OS10(config-pmap-qos)# class CM_QOS_MATCH_CS3
OS10(config-pmap-c-qos)# set qos-group 3
OS10(config-pmap-c-qos)# set dscp 24
OS10(config-pmap-c-qos)# exit
OS10(config-pmap-qos)# exit
  2. Configure class map and policy map for the network port. Traffic with a DSCP value of 24 is matched, assigned to qos-group 3, and marked with a CoS value of 3. 
    OS10(config)# class-map type qos CM_QOS_MATCH_DSCP24
OS10(config-cmap-qos)# match ip dscp 24
OS10(config-cmap-qos)# exit
OS10(config)# policy-map type qos PM_QOS_NETWORK_PORT
OS10(config-pmap-qos)# !
OS10(config-pmap-qos)# class CM_QOS_MATCH_DSCP24
OS10(config-pmap-c-qos)# set qos-group 3
OS10(config-pmap-c-qos)# set cos 3
OS10(config-pmap-c-qos)# exit
OS10(config-pmap-qos)# exit
  3. Configure queuing at egress with a bandwidth allocation of 65% for queue 3. 
    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)# !
OS10(config-pmap-queuing)# class CM_QUEUING_Q3
OS10(config-pmap-c-que)# bandwidth percent 65
OS10(config-pmap-c-que)# exit
OS10(config-pmap-queuing)# exit
  4. Configure policy map for the VLTi port. 
    OS10(config)# policy-map type qos PM_QOS_VLTI
OS10(config-pmap-qos)# !
OS10(config-pmap-qos)# class CM_QOS_MATCH_DSCP24
OS10(config-pmap-c-qos)# set qos-group 3
OS10(config-pmap-c-qos)# !
OS10(config-pmap-c-qos)# class CM_QOS_MATCH_CS3
OS10(config-pmap-c-qos)# set qos-group 3
OS10(config-pmap-c-qos)# exit
OS10(config-pmap-qos)# exit
  5. Apply the QoS configuration on the access, network, and VLTi ports. 
    OS10# configure terminal
OS10(config)# interface ethernet 1/1/1
OS10(conf-if-eth1/1/1)# service-policy input type qos PM_QOS_ACCESS_PORT
OS10(config)# interface ethernet 1/1/2
OS10(conf-if-eth1/1/2)# service-policy input type qos PM_QOS_ACCESS_PORT
OS10(config)# interface ethernet 1/1/11
OS10(conf-if-eth1/1/11)# service-policy input type qos PM_QOS_VLTI
OS10(config)# interface ethernet 1/1/21
OS10(conf-if-eth1/1/21)# service-policy input type qos PM_QOS_NETWORK_PORT
OS10(config)# interface ethernet 1/1/22
OS10(conf-if-eth1/1/22)# service-policy input type qos PM_QOS_NETWORK_PORT
  6. Apply the queuing policy map globally in the system-qos mode. 
    OS10(config)# system qos
OS10(config-sys-qos)# service-policy output type queuing PM_QUEUING
OS10(config-sys-qos)# end

L4 Switch

  1. Configure class map and policy map for access port. Traffic with a CoS value of 3 is matched, assigned to qos-group 3, and marked with a DSCP value of 24. 
    OS10(config)# class-map type qos CM_QOS_MATCH_CS3
OS10(config-cmap-qos)# match cos 3
OS10(config-cmap-qos)# exit
OS10(config)# policy-map type qos PM_QOS_ACCESS_PORT
OS10(config-pmap-qos)# !
OS10(config-pmap-qos)# class CM_QOS_MATCH_CS3
OS10(config-pmap-c-qos)# set qos-group 3
OS10(config-pmap-c-qos)# set dscp 24
OS10(config-pmap-c-qos)# exit
OS10(config-pmap-qos)# exit
  2. Configure class map and policy map for the network port. Traffic with a DSCP value of 24 is matched, assigned to qos-group 3, and marked with a CoS value of 3. 
    OS10(config)# class-map type qos CM_QOS_MATCH_DSCP24
OS10(config-cmap-qos)# match ip dscp 24
OS10(config-cmap-qos)# exit
OS10(config)# policy-map type qos PM_QOS_NETWORK_PORT
OS10(config-pmap-qos)# !
OS10(config-pmap-qos)# class CM_QOS_MATCH_DSCP24
OS10(config-pmap-c-qos)# set qos-group 3
OS10(config-pmap-c-qos)# set cos 3
OS10(config-pmap-c-qos)# exit
OS10(config-pmap-qos)# exit
  3. Configure queuing at egress with a bandwidth allocation of 65% for queue 3. 
    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)# !
OS10(config-pmap-queuing)# class CM_QUEUING_Q3
OS10(config-pmap-c-que)# bandwidth percent 65
OS10(config-pmap-c-que)# exit
OS10(config-pmap-queuing)# exit
  4. Configure policy map for the VLTi port. 
    OS10(config)# policy-map type qos PM_QOS_VLTI
OS10(config-pmap-qos)# !
OS10(config-pmap-qos)# class CM_QOS_MATCH_DSCP24
OS10(config-pmap-c-qos)# set qos-group 3
OS10(config-pmap-c-qos)# !
OS10(config-pmap-c-qos)# class CM_QOS_MATCH_CS3
OS10(config-pmap-c-qos)# set qos-group 3
OS10(config-pmap-c-qos)# exit
OS10(config-pmap-qos)# exit
  5. Apply the QoS configuration on the access, network, and VLTi ports. 
    OS10# configure terminal
OS10(config)# interface ethernet 1/1/1
OS10(conf-if-eth1/1/1)# service-policy input type qos PM_QOS_ACCESS_PORT
OS10(config)# interface ethernet 1/1/2
OS10(conf-if-eth1/1/2)# service-policy input type qos PM_QOS_ACCESS_PORT
OS10(config)# interface ethernet 1/1/11
OS10(conf-if-eth1/1/11)# service-policy input type qos PM_QOS_VLTI
OS10(config)# interface ethernet 1/1/21
OS10(conf-if-eth1/1/21)# service-policy input type qos PM_QOS_NETWORK_PORT
OS10(config)# interface ethernet 1/1/22
OS10(conf-if-eth1/1/22)# service-policy input type qos PM_QOS_NETWORK_PORT
  6. Apply the queuing policy globally in the system-qos mode. 
    OS10(config)# system qos
OS10(config-sys-qos)# service-policy output type queuing PM_QUEUING
OS10(config-sys-qos)# end

S1 Switch

  1. Configure class map and policy map for the access port. Traffic with a DSCP value of 24 is matched and assigned to qos-group 3. 
    OS10(config)# class-map type qos CM_QOS_MATCH_DSCP24
OS10(config-cmap-qos)# match ip dscp 24
OS10(config-cmap-qos)# exit
OS10(config)# policy-map type qos PM_QOS_LEAF_PORT
OS10(config-pmap-qos)# class CM_QOS_MATCH_DSCP24
OS10(config-pmap-c-qos)# set qos-group 3
OS10(config-pmap-c-qos)# exit
OS10(config-pmap-qos)# exit
  2. Configure queuing at egress with a bandwidth allocation of 65% for queue 3. 
    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)# exit
OS10(config-pmap-queuing)# exit
  3. Apply the queuing policy globally in the system-qos mode. 
    OS10(config)# system qos 
OS10(config-sys-qos)# show configuration 
OS10(config-sys-qos)# service-policy output type queuing PM_QUEUING
OS10(config-sys-qos)# exit
  4. Apply QoS configuration on the leaf node-facing ports. 
    OS10(config)# interface ethernet 1/1/21
OS10(conf-if-eth1/1/21)# service-policy input type qos PM_QOS_LEAF_PORT
OS10(config)# interface ethernet 1/1/22
OS10(conf-if-eth1/1/22)# service-policy input type qos PM_QOS_LEAF_PORT
OS10(config)# interface ethernet 1/1/23
OS10(conf-if-eth1/1/23)# service-policy input type qos PM_QOS_LEAF_PORT
OS10(config)# interface ethernet 1/1/24
OS10(conf-if-eth1/1/24)# service-policy input type qos PM_QOS_LEAF_PORT

S2 Switch

  1. Configure class map and policy map for the access port. Traffic with a DSCP value of 24 is matched and assigned to qos-group 3. 
    OS10(config)# class-map type qos CM_QOS_MATCH_DSCP24
OS10(config-cmap-qos)# match ip dscp 24
OS10(config-cmap-qos)# exit
OS10(config)# policy-map type qos PM_QOS_LEAF_PORT
OS10(config-pmap-qos)# class CM_QOS_MATCH_DSCP24
OS10(config-pmap-c-qos)# set qos-group 3
OS10(config-pmap-c-qos)# exit
OS10(config-pmap-qos)# exit
  2. Configure queuing at egress with a bandwidth allocation of 65% for queue 3. 
    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)# exit
OS10(config-pmap-queuing)# exit
  3. Apply the queuing policy globally in the system-qos mode. 
    OS10(config)# system qos 
OS10(config-sys-qos)# show configuration 
OS10(config-sys-qos)# service-policy output type queuing PM_QUEUING
OS10(config-sys-qos)# exit
  4. Apply QoS configuration on the leaf node-facing ports. 
    OS10(config)# interface ethernet 1/1/21
OS10(conf-if-eth1/1/21)# service-policy input type qos PM_QOS_LEAF_PORT
OS10(config)# interface ethernet 1/1/22
OS10(conf-if-eth1/1/22)# service-policy input type qos PM_QOS_LEAF_PORT
OS10(config)# interface ethernet 1/1/23
OS10(conf-if-eth1/1/23)# service-policy input type qos PM_QOS_LEAF_PORT
OS10(config)# interface ethernet 1/1/24
OS10(conf-if-eth1/1/24)# service-policy input type qos PM_QOS_LEAF_PORT

Verify the configuration

  • Verify the bandwidth settings. 
    OS10# show queuing weights interface ethernet 1/1/99:3
Interface ethernet1/1/99:3
Queue    Weight(In percentage)
--------------------------------
0         5         
1         5         
2         5         
3         65        
4         5         
5         5         
6         5         
7         5
  • Verify if the packets are assigned to the respective queues. Packets with a dot1p priority of 3 or DSCP value of 24 is assigned queue 3 and packets with other dot1p priority or DSCP value is assigned to queue 0. Given that we have allocated a bandwidth of 65% to queue 3, queue 3 traffic gets more bandwidth and other traffic gets less bandwidth. During congestion, the drop counter indicates packet drops for queue 0 and no drops for queue 3. Notice that in the following show outputs, traffic from queue 0 is dropped when there is congestion; however, queue 3 still gets a guaranteed bandwidth of 65%.

    Network port of L1 switch (ingress VTEP): 

    OS10# show queuing statistics interface ethernet 1/1/21
Interface ethernet1/1/21
Queue Packets   Bytes       Dropped-Packets  Dropped-Bytes            
0     6278443   1896079620  8363856          2559327800               
1     0         0           0                0                        
2     0         0           0                0                        
3     14648249  4423771198  0                0                        
4     0         0           0                0                        
5     0         0           0                0                        
6     0         0           0                0                        
7     0         0           0                0

    Access ports of L3 switch (destination VTEP): 

    OS10# show queuing statistics interface ethernet 1/1/1
Interface ethernet1/1/1
Queue Packets   Bytes       Dropped-Packets  Dropped-Bytes            
0     18415845  4788112915  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    
    OS10# show queuing statistics interface ethernet 1/1/2
Interface ethernet1/1/2
Queue Packets   Bytes        Dropped-Packets  Dropped-Bytes            
0     55        4857         0                0                        
1     0         0            0                0                        
2     0         0            0                0                        
3     57904965  14823671040  0                0                        
4     0         0            0                0                        
5     0         0            0                0                        
6     0         0            0                0                        
7     0         0            0                0
  • Leaf node-facing port of S1 switch: 
    OS10# show queuing statistics interface ethernet 1/1/21
Interface ethernet1/1/21
Queue Packets     Bytes         Dropped-Packets  Dropped-Bytes            
0     1711761863  519748332392  0                0                        
1     0           0             0                0                        
2     0           0             0                0                        
3     1143474565  345329318630  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 1/1/22
Interface ethernet1/1/22
Queue Packets      Bytes          Dropped-Packets  Dropped-Bytes            
0     1028979481   310751481156   0                0                        
1     0            0              0                0                        
2     0            0              0                0                        
3     1351068390   408022653780   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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