The network QoS policy consists of an ingress and egress component. For 7210 SAS-T devices operating in access-uplink mode, network policy is available for use. The ingress component of the policy defines how dot1p bits are mapped to internal forwarding class and profile state (DSCP is not available for use). The forwarding class and profile state define the Per Hop Behavior (PHB) or the QoS treatment through the system.
The mapping on each access uplink port defaults to the mappings defined in the default network QoS policy until an explicit policy is defined for the access uplink ports. It also defines the rate-limiting parameters for the traffic mapped to each forwarding classes. Traffic mapped to each forwarding class can be rate limited using separate meters for each unicast and multipoint traffic.
The egress component of the network QoS policy provides an option to define either dot1p bits and IP DSCP marking values or both associated with each forwarding class. By default, network QoS policy remarking is always disabled. If the egressing packet originated on an ingress SAP, the egress QoS policy also defines the dot1p bit marking based on the forwarding class and the profile state. The default map of FC-dot1p marking is as shown in default network QoS policy of type 'port', where in the policy-id is equal to 1. All non-default network QoS policies inherits the FC-dot1p map.
Network policy-id 1 exists as the default policy and is applied to access uplink ports.The network policy-id 1 cannot be modified or deleted. It defines the default dot1p-to-FC mapping and default meters for unicast and multipoint meters for the ingress. For the egress, it defines eight forwarding classes and the packet marking criteria.
New (non-default) network policy parameters can be modified. The no form of this command reverts the object to the default values.
Changes made to a policy are applied immediately to all ports 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 devices, see the "CLI Usage" chapter in the 7210 SAS-Mxp, R6, R12, S, Sx, T Basic System Configuration Guide.