Access-uplink ports are typically used to connect to the core network using QinQ or dot1q links and forward customer traffic toward the core network. A network QoS policy defines both ingress and egress behavior on a access-uplink port. On access-uplink port ingress, traffic that enters through the port is classified to map it to an FC and the user has an option to assign a profile.
FC is associated with ingress queues on access-uplink port ingress and the profile determines the enqueing priority for the packet, with in-profile packets have a higher chance of getting the buffer, than out-of-profile packets. The mapping of traffic to FC ingress queues is based on QoS marking (for example, IEEE 802.1p bits, IP DSCP bits).
The characteristics of the FC ingress queues are defined within the policy with regard to the number of FC queues for unicast traffic type and BUM traffic type, along with the queue rate and buffer parameters (like CIR, PIR, CBS, MBS, and so on). Each of the FCs can be associated with different ingress queue parameters for unicast traffic type and for multipoint (that is BUM) traffic type. A network QoS policy defines up to eight ingress queues per policy, with up to 2 ingress queues per FC. Unicast and multipoint traffic can be defined to use the same ingress queue or different ingress queues per FC.
For VPLS, the following types of forwarding are supported:
unicast
multicast
broadcast
unknown.
Multicast, broadcast, and unknown types are sent to multiple destinations within the service, while the unicast forwarding type is handled in a point-to-point manner within the service. All these traffic types use the same queue (a separate queue for multicast, broadcast, and unknown unicast traffic types cannot be defined).
On access-uplink port egress, the policy maps FC and profile state to any combination of dot1p and IP DSCP values for traffic to be transmitted out of the access-uplink port. All the access-uplink SAPs configured on the same access-uplink port use the same policy and the same set of FC queues. That is, traffic received and transmitted through all the access-uplink SAPs configured on a specific access-uplink port receive similar QoS treatment.