Manual Chapter :
Overview: Traffic prioritization using quality of service (QoS)
Applies To:
Show Versions
F5OS-C
- 1.6.0, 1.5.1, 1.5.0, 1.3.2, 1.3.1, 1.3.0, 1.2.2, 1.2.1, 1.2.0
Traffic prioritization using QoS overview
To minimize the chance that higher priority traffic is dropped when traffic congestion occurs, you can enable and configure the VELOS system to prioritize higher priority traffic over other types of traffic. The quality of service (QoS) feature enables you to configure the weight of packet types, according to the 802.1p or DSCP field, to guarantee that a percentage of a given type of traffic is processed and not dropped when there is a high volume of traffic.
This feature enables QoS queues, also called traffic priorities. There are eight QoS queues per port in VELOS systems. You can map either 802.1p or DSCP values to each queue, so that when a packet comes in, it is categorized into one of the queues according to its 802.1p or DSCP value. You can then assign a weight percentage to each queue, and on egress, the system ensures that the outgoing traffic is composed of traffic according to the percentage given from each queue. This metering occurs only when the system is congested, and traffic will not be dropped when the system is not congested.
The mapping of 802.1p or DSCP values occurs on a per-chassis partition basis at the chassis partition level on a VELOS system and apply only if a tenant is configured on the chassis partition.
The corresponding QoS settings for a tenant are not applicable to VELOS systems. For information about configuring QoS at the tenant level, see the documentation for your specific tenant.
You can configure traffic prioritization from either the chassis partition CLI or chassis partition webUI.
Quality of service (QoS) terminology
These are some of the terms and that you will
encounter when configuring quality of service (QoS) on the VELOS
system.
Term |
Definition |
|---|---|
traffic priority |
A quality of service (QoS) queue. |
meter |
A mapping of traffic priority to weight. |
meter group |
A set of eight mappings of each traffic priority to
its weight. |
Differentiated Services Code Point (DSCP) |
A means of classifying and managing network traffic
and of providing QoS in Layer 3 IP networks. |
802.1p |
A means of marking ports at Layer 2 with a class of
service (CoS) value to help implement QoS at Layer 2. |
