After traffic is switched through the fabric from one or several access ingress adapter cards to a network egress adapter card, queuing-level aggregation on a per-forwarding-class basis is performed on all of the received packets.
An adapter card that is used for network egress can receive—and will likely receive—packets from multiple adapter cards that are configured for access ingress operations, and from the CSM. Adapter cards that are configured for network access permit user configuration of queues and the association of forwarding classes to the queues. These are the same configuration principles that are used for adapter cards that are configured for access ingress connectivity. Like access ingress, more than one forwarding class can share the same queue.
Aggregation of different forwarding classes under queues takes place for each bundle or port. If a port is a member of a bundle, such as a Multilink Point-to-Point Protocol (MLPPP) bundle, then the aggregation and queuing is implemented for the entire bundle. If a port is a standalone port, that is, not a member of bundle, then the queuing takes place for the port.