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Table Of Contents
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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
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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.
1540 Quality of service