The following example shows creating the control plane service policy.Dell#confDell(conf)#control-planeDell(conf-control-plane)#service-policy rate-limit-cpu-queues cpuq_rate_policyProtocol to CPU Queue MappingCoPP enables you to rate-limit control-plane packets that are destined to the CPU there by, preventing undesired or malicious traffic fromentering the CPU queues. You can rate-limit CPU bound traffic both on a per protocol as well as per queue basis.When packets ingress through any of the front-end ports, the system identifies the packets that are CPU bound based on the protocolconfigurations. Packets bound to the CPU are also identified based on the packet-type such as ttl0, ttl1, and so on. These packets are thenre-directed to the CPU on predefined CPU queues. This type of Control traffic re-direction is achieved using ACLs or through the protocol-to-queue table that is maintained in BCM.The following table shows the default protocol to CPU queue mapping:Table 13. Protocol to CPU Queue MappingCPUQueueWeight CPU QueueRate Shape(PPS Rate)Protocol0 1 600 TTL0, TTL1, IP-OPTS,L2-SRC-MISS,L2-ACL-LOG,ICMP-REDIRECT1 2 1000 SFLOW, L3-MTU-FAIL2 4 300 MCAST, BCAST-CTRL3 64 1300 BFD4 127 2000 VLT5 8 400 ARP-REQ,ICMP-RA, ICMP-NA,ISCSI6 64 400 ARP-RSP, NTP, ICMP, ICMP-RS, ICMP-NS, FTP, TELNET, SSH, L3-LOCAL-TERM, DAI7 64 400 xSTP, LACP, 802DOT1X, TRILL, L2PT, ECFM8 64 600 LLDP, PVST, GVRP, FEFD, TRACEFLOW, FCoE9 64 600 BGP, OSPF, IPV6-TUNNEL, IPV6-VRRP, RIP, ISIS10 64 600 IPV4-VRRP, DHCP11 64 300 MLD, PIM, MSDPConfiguring Protocol to CPU Queue MappingYou can configure the mapping between CPU queues and the protocols that can be assigned to each CPU queue. This feature enables youto optimize buffer usage and control the security related aspects corresponding to the control traffic.To configure CPU bound control-plane traffic to map to specific CPU queues:1 Create a CPU protocol group.CONFIGURATIONcpu-protocol-group group-nameA CPU protocol group is created and the command mode changes to CPU-PROTOCOL-GROUP mode.2 Create a protocol list.Control Plane Policing (CoPP) 243
