A maximum of 8 traffic queues can be used on SD-WAN interfaces. For each traffic queue, you must specify the minimum and maximum bandwidth as a percentage of the total bandwidth set for the SD-WAN interface. The sum total of all minimum bandwidth values specified for traffic queues may not exceed 100%.
The traffic queues are strict priority and unreserved bandwidth is first offered to traffic from the higher-priority queue. Each traffic queue is guaranteed certain minimum bandwidth in accordance with its specified minimum bandwidth value. An upper limit on the maximum bandwidth for higher-priority queues is necessary to allow traffic from lower-priority traffic queues to still be transmitted.
You can configure traffic queues when creating SD-WAN interfaces of the WAN type or editing SD-WAN interfaces of the WAN or LAN type.
Service providers can use different quality of service policies to mark traffic queues in their networks and meet SLA requirements for the passage of client traffic. Therefore, when simultaneously connecting to the networks of different service providers, CPE devices can relabel traffic of different queues for each SD-WAN interface of the WAN type. To configure relabeling, you must change the type of service (ToS) when configuring queues on an SD-WAN interface.
You can only change the ToS values of external headers of traffic packets originating from SD-WAN interfaces of the WAN type. ToS values of internal traffic packet headers cannot be edited.
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