The network QoS policy consists of an ingress and egress component for interfaces in the IP domain, and a ring component for interfaces in the bridging domain.
The ingress component of the QoS policy defines how DSCP bits (for GRE and IP) and multiprotocol label switching (MPLS) Experimental (EXP) bits are mapped to internal forwarding class and profile state. The forwarding class and profile state define the per-hop behavior (PHB) or the QoS treatment through the 7705 SAR.
The egress component of the QoS policy defines the DSCP bit, MPLS EXP bit, and the dot1p marking based on the forwarding class and the profile state.
The ring component of the QoS policy defines how dot1p bits are mapped to network queue and profile state.
The mapping on each network interface defaults to the mappings defined in the default network QoS policy until an explicit policy is defined for the network interface. Network policy-id 1 exists as the default policy that is applied to all network interfaces by default. The network policy-id 1 cannot be modified or deleted. For the ingress, it defines the default DSCP-to-FC and profile state, and MPLS EXP-to-FC and profile state mappings. For the egress, it defines eight forwarding classes and profile states that represent the packet marking criteria. For the ring, it defines eight dot1p-to-queue and profile state mappings.
New (non-default) network policy parameters can be modified. The no form of the command reverts to the default values.
Changes made to a policy are applied immediately to all network interfaces where the policy is applied. For this reason, when a policy requires several changes, it is recommended that you copy the policy to a work area policy-id. The work-in-progress copy can be modified until all the changes are made, and then the original policy-id can be overwritten with the config qos copy command.
For information about the tasks and commands necessary to access the command line interface and to configure and maintain your 7705 SAR devices, refer to the 7705 SAR Basic System Configuration Guide, ‟CLI Usage”.