QoS Policies
42 Quality of Service Guide
Default QoS policies maps all traffic with equal priority and allow an equal chance of
transmission (Best Effort (be) forwarding class) and an equal chance of being dropped during
periods of congestion. QoS prioritizes traffic according to the forwarding class and uses
congestion management to control access ingress, access egress, and network traffic with
queuing according to priority
Network QoS Policies
Network QoS policies define egress QoS marking and ingress QoS interpretation for traffic
on core network IP interfaces. The router automatically creates egress queues for each of the
forwarding classes on network IP interfaces.
A network QoS policy defines both the ingress and egress handling of QoS on the IP
interface. The following functions are defined.
• Ingress
→ Defines DSCP, Dot1p, and IP criteria mappings to forwarding classes
→ Defines LSP EXP value mappings to forwarding classes
•Egress
→ Defines DSCP and prec mappings to forwarding classes
→ Defines the forwarding class to DSCP value markings
→ Defines the forwarding class to Dot1p/DE value markings
→ Defines forwarding class to LSP EXP value markings
→ Enables/disables remarking of QoS
→ Defines FC to policer/queue-group queue mapping
The required elements to be defined in a network QoS policy are:
• A unique network QoS policy ID
• Egress forwarding class to DSCP value mappings for each forwarding class
• Egress forwarding class to Dot1p value mappings for each forwarding class
• Egress forwarding class to LSP EXP value mappings for each forwarding class
• Enabling/disabling of egress QoS remarking
• A default ingress forwarding class and in-profile/out-of-profile state
Optional network QoS policy elements include:
• DSCP name to forwarding class and profile state mappings for all DSCP values
received
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