Dell PowerSwitch S4128F-ON OS10 Enterprise Edition User Guide Release 10.4.1.0 - Page 669

Control-plane policing Control-plane policing (CoPP) increases security on the system by protecting the route processor from unnecessary traffic and giving priority to important control plane and management traffic. CoPP uses a dedicated control plane configuration through the QoS CLIs to set rate-limiting capabilities for control plane packets. If the rate of control packets towards the CPU is higher than the packet rate that the CPU can handle, CoPP provides a method to selectively drop some of the control traffic so that the CPU can process high-priority control traffic. You can use CoPP to rate-limit traffic through each CPU port queue of the network processor (NPU). CoPP applies policy actions on all control-plane traffic. The control-plane class map does not use any match criteria. To enforce rate-limiting or rate policing on control-plane traffic, create policy maps. You can use the control-plane command to attach the CoPP service policies directly to the control-plane. The default rate limits apply to 12 CPU queues and the protocols mapped to each CPU queue. The control packet type to CPU ports control queue assignment is fixed. The only way you can limit the traffic towards the CPU is choose a low priority queue, and apply ratelimits on that queue to find a high rate of control traffic flowing through that queue. By default CoPP traffic towards the CPU is classified into different queues as shown in the following table. Table 36. CoPP queues Queue 0 1 2 3 4 5 6 7 8 9 10 11 Protocol IPv6 IGMP VLT, NDS ICMPv6, ICMPv4 ARP Requet, ICMPV6-RS-NS, ISCSI snooping, ISCSI-COS ICMPv6-RA-NA, SSH, TELNET,TACACS, NTP,FTP RSTP,PVST, MSTP,LACP Dot1X,LLDP, FCOE-FPORT BGPv4, OSPFv6 DHCPv6, DHCPv4, VRRP OSPF Hello, OpenFlow See show control-plane info for information on the current protocol to queue mapping and the rate-limit configured per queue. Quality of service 669