AppQoS is a feature that enables you to identify and control access to specific applications and provides the granularity of the stateful firewall rule base to match and enforce quality of service (QoS) at the application layer. AppQoS expands the capability of Junos OS class of service (CoS) to include the following capabilities12:
Re-write DSCP values based on Layer-7 application types. DSCP values are used to convey the packet’s quality of service through both the forwarding class and a loss priority.
Assign a forwarding class based on the application type. Forwarding classes are used to group packets with similar QoS requirements and map them to output queues on the egress interface.
Rate-limit traffic based on the application type. Rate limiters are used to control the transmission speed and volume for the associated queues. You can configure rate limiters and profiles to specify the bandwidth, burst size, and action for each application type.
AppQoS does not have the capability to re-write the TTL or reserve bandwidth. Re-writing the TTL is not related to QoS and could cause routing loops or packet drops. Reserving bandwidth is a function of traffic engineering, not AppQoS. References:
1: Application QoS | Junos OS | Juniper Networks
2: AppQoS for Tenant Systems | Junos OS | Juniper Networks
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