Reference Guide

CoPP applies policy actions on all control-plane trac. The control-plane class map does not use any match criteria. To enforce rate-limiting

or rate policing on control-plane trac, 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 xed. The only way you can limit the trac towards the CPU is choose a low priority queue, and apply rate-

limits on that queue to nd a high rate of control trac owing through that queue.

By default CoPP trac towards the CPU is classied into dierent queues as shown in the following table.

Table 11. CoPP queues

Queue Protocol

0 IPv6

2 IGMP

3 VLT, NDS

4 ICMPv6, ICMPv4

5 ARP Requet, ICMPV6-RS-NS, ISCSI snooping, ISCSI-COS

6 ICMPv6-RA-NA, SSH, TELNET,TACACS, NTP,FTP

7 RSTP,PVST, MSTP,LACP

8 Dot1X,LLDP, FCOE-FPORT

9 BGPv4, OSPFv6

10 DHCPv6, DHCPv4, VRRP

11 OSPF Hello, OpenFlow

See show control-plane info for information on the current protocol to queue mapping and the rate-limit congured per queue.

Congure control-plane policing

Rate-limiting the protocol CPU queues requires conguring control-plane type QoS policies.

• Create QoS policies (class maps and policy maps) for the desired CPU-bound queue.

• Associate the QoS policy with a particular rate-limit.

• Assign the QoS service policy to control plane queues.

By default, the peak information rate (pir) and committed information rate (cir) values are in packets per second (pps) for control plane.

CoPP for CPU queues converts the input rate from kilobits per second (kbps) to packets per second (pps), assuming 64 bytes is the

average packet size, and applies that rate to the corresponding queue – 1 kbps is roughly equivalent to 2 pps.

1 Create a class-map of type control-plane and congure a name for the class-map in CONFIGURATION mode.

class-map type control-plane class-map-name

2 Return to CONFIGURATION mode.

exit

Quality of service

565