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Queuing on 10-Gigabit Ethernet LAN/WAN PICs Properties

The 10-Gigabit Ethernet LAN/WAN PICs have the following features to support queuing:

  • Committed and peak information rate shaping on a per-queue basis

  • Excess information rate configuration for allocation of excess bandwidth

  • Ingress queuing based on behavior aggregate (BA) classification

  • Egress queuing at the Packet Forwarding Engine and at the PIC level

    The Packet Forwarding Engine egress queues are shared by two physical interfaces in a port group.

  • Weighted round-robin (WRR) scheduling with two queue priorities (low and strict-high)

  • Two special queues available in ingress, one per physical interface, called control queues

    Layer 2 and Layer 3 control protocol packets (OSPF, OSPF3, VRRP, IGMP, RSVP, PIM, BGP, BFD, LDP, ISIS, RIP, RIPV6, LACP, ARP, IPv6 NDP, CFM, and LFM) are mapped to the control queue. In the control queue, these packets are not dropped even if there is oversubscription or congestion on a port group.


    The control queue is rate-limited to 2 Mbps per physical interface. The packets in excess of 2 Mbps are dropped and accounted for.