Network QoS policies on access-uplink ports

Network QoS policies define egress QoS marking and ingress QoS interpretation for traffic received on access-uplink ports. The router automatically creates egress queues for each of the FCs on the access-uplink port.

A network QoS policy defines both the ingress and egress handling of QoS on the access-uplink ports. The following functions are defined:

• ingress

  • defines dot1p value mapping to FCs and profile

  • defines FC to meter mapping

• egress

  • defines the FC and profile state to dot1p value markings

  • option to define the FC and profile state to IP DSCP value marking

  • remarking of QoS bits can be enabled or disabled

The required network QoS policy definitions are the following:

• a unique network QoS policy ID

• egress - FC and profile state to priority bits (for example, 802.1p, and so on) used for marking, for each FC

• a default ingress FC and an optional in-profile or out-of-profile state

• at least one default unicast FC meter. See Committed information rate (meters) for information about meter configuration parameters.

• optional multipoint FC meter

The optional network QoS policy elements definitions are the following:

• additional unicast meters or queues

• additional multipoint meters or queues

• dot1p value to FC and profile state mappings for all values received

• option to use DEI bit along with dot1p classification for profile state mapping

• option to define the FC and profile state to IP DSCP value marking

Network policy ID 1 is reserved for the default network QoS policy. The default policy cannot be deleted or changed. The default network QoS policy is applied to all access-uplink ports that do not have another network QoS policy explicitly assigned.

The network QoS policy applied at network egress (that is, on an access-uplink port egress) determines how or whether the profile state is marked in packets transmitted into the service core network. If the profile state is marked in the service packets, out-of-profile packets are preferentially dropped over in-profile packets at congestion points in the network. For network egress, traffic remarking in the network QoS policy can be enabled or disabled for 7210 SAS-D and 7210 SAS-Dxp. The following table lists the default mapping of FC to dot1p values for egress marking on the 7210 SAS-D.