SLX-OS VXLAN Layer 2 gateways can support QoS.
A VXLAN L2 gateway can interconnect tenants in the same subnet through the VXLAN configuration. The following figure illustrates a simple use case where a packet is sent from VM1. If it is a BUM packet, Leaf-A floods through the packet to all the VTEPs in the same VXLAN segment, until the MAC table at Leaf-A is populated with corresponding entries through mechanisms such as EVPN. Meanwhile, the known unicast packet is forwarded in unicast mode to the corresponding VTEP only. At Leaf-A, the Traffic Class/802.1p marking of the tenant frame determines the DSCP of the added IP header, and the IP header is followed by the VXLAN header. At terminating leaf nodes, the DSCP of the IP header is ignored and the Traffic Class/802.1p marking of the tenant frame is thereby exposed, and the original tenant frame is used to determine the QoS policy for switching the frame to the destination VM.
Enter the qos-ttl-mode uniform command to set the QoS type mode to uniform, which is the default, when configuring the VXLAN L2 gateway. For example, enter the following commands when configuring the gateway for the ingress (tunneling) side of packet forwarding:
device# configure terminal device(config)# overlay-gateway gateway_L2 device(config-overlay-gw-gateway_L2)# type layer2-extension device(config-overlay-gw-gateway_L2)# ip interface loopback 1 device(config-overlay-gw-gateway_L2)# qos-ttl-mode uniform device(config-overlay-gw-gateway_L2)# map vni auto device(config-overlay-gw-gateway_L2)# activate
Note
For information about QoS configuration on VXLAN L3 gateways and on VLAN L2 and L3 gateway interconnections, refer to "QoS for VXLAN Layer 3 gateways" and "QoS for VXLAN Layer 2 and Layer 3 gateway interconnections".