Scheduling and Shaping on 10-Gigabit Ethernet LAN/WAN PICs Overview

The 10-Gigabit Ethernet LAN/WAN PIC has ten 10-Gigabit Ethernet ports providing 100 Gbps of WAN bandwidth and 50 Gbps of Packet Forwarding Engine bandwidth. On the ingress side of the 10-Gigabit Ethernet LAN/WAN PIC, two consecutive physical interfaces on the PICs are grouped together into a port group and are serviced by a single scheduler. The port groups are as shown in Table 1:

The two physical interfaces in a port group share 10 Gbps bandwidth towards the Packet Forwarding Engine. A scheduler has eight class-of-service (CoS) queues and two control queues. On the ingress side of the 10-Gigabit Ethernet LAN/WAN PIC, the eight CoS queues are split four plus four for the two physical interfaces. Thus, the 10-Gigabit Ethernet LAN/WAN PIC supports four ingress queues and eight egress queues per physical interface.

At the ingress side of the 10-Gigabit Ethernet LAN/WAN PIC, multiple forwarding classes can be mapped to one queue using the restricted-queue configuration. When creating a scheduler-map for the ingress queues, only one forwarding class should be chosen from the multiple forwarding classes that map to the same queue. Then, the scheduler-map can be specified using the set class-of-service scheduler-maps map-name forwarding-class class-name scheduler scheduler command.

The 10-Gigabit Ethernet LAN/WAN PICs manage packet buffering internally and no configuration is required.