Class of Service Overview for Services PICs (Next Gen Services)
You can configure CoS Differentiated Services (DiffServ) code point (DSCP) marking and forwarding-class assignment for packets transiting a services PIC while being processed by a service set.
Configure services CoS rules, which identify the matching conditions for packet source and destination addresses and for packet applications, and the actions to take on those packets. You must apply CoS rules to a service set before the rules can be applied to traffic. Only stateful firewall and NAT rules can be used with CoS rules in a service set.
You can also configure specific CoS actions for FTP and for SIP traffic by creating an application profile. The application profile can then be referenced in the CoS rule actions.
The services CoS rules do not support scheduling. You must configure scheduling at the [edit class-of-service] hierarchy level on the output interface or fabric.
When configuring Next Gen Services with the MX-SPC3 services card, the service set must include at least one stateful firewall (SFW) rule or NAT rule, or services CoS does not work. Only stateful firewall and NAT rules can be used with CoS rules in a service set. CoS works without NAT and SFW rules also.
CoS for traffic on a services PIC lets you classify traffic flows based on stateful firewall and NAT configurations.