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Copp Speed limit

show copp

Section titled “show copp”

[Command] show copp

[Purpose] View the mapping of packets types and queues

[View] System

[Usage Scenario] In a network, there are various types of packets sent to the CPU, both normal and potentially malicious. If too many packets are sent to the CPU, it can lead to high CPU utilization, performance degradation, and even system interruption. COPP (Control Plane Policing) rate-limits packets that need to be sent to the CPU based on specified queue rates. This ensures that the rate of packets sent to the CPU remains within the CPU’s normal operational capacity, preventing system disruptions.

[Use Cases]

sonic# show copp
TrapId       Queue  MeterType  CIR   ACTION
------------- ------- ----------- ------- --------
ttl_error      0    packets   150pps  trap
mtu_error      0    packets   150pps  drop
default        0    packets   2500pps trap
acl            0    packets   1250pps trap
ip2me          1    packets   2500pps trap
snmp           1    packets   2500pps trap
iccp           1    packets   3750pps trap
telnet         1    packets   2500pps trap
ssh            1    packets   3750pps trap
pim            2    packets   1250pps trap
ptp            2    packets   1250pps trap
igmp           2    packets   1250pps trap
mld            2    packets   1250pps trap
sample_packet  2    packets   1250pps trap
dhcp           3    packets   4500pps copy
dhcpv6         3    packets   4500pps copy
lldp           4    packets   400pps  trap
isis           4    packets   1250pps trap
bgp            4    packets   4500pps trap
arp            5    packets   4500pps copy
icmp           5    packets   1250pps trap
ndp            5    packets   4500pps copy
eapol          6    packets   1000pps trap
lacp           6    packets   800pps  trap
snp            6    packets   4500pps trap
stp            6    packets   800pps  trap
bfd            7    packets   2000pps trap
vrrp           7    packets   1250pps copy
vrrpv6         7    packets   1250pps copy
ospfv6         7    packets   4500pps trap
ospf           7    packets   4500pps trap
bfdv6          7    packets   2000pps trap

show queue cpu-port

Section titled “show queue cpu-port”

[Command] show queue cpu-port

[Purpose] View CPU queue statistics

[View] System view

[Use Cases]

sonic# show queue cpu-port
 Port  RxQ  Counter/pkts  Drop/pkts  Rate/pkts
------ ----- -------------- ----------- -----------
  CPU  ALL0        0      0          0.00/s
  CPU  ALL1        0      0          0.00/s
  CPU  ALL2        0      0          0.00/s
  CPU  ALL3        0      0          0.00/s
  CPU  ALL4      2085     0          0.10/s
  CPU  ALL5        0      0          0.00/s
  CPU  ALL6      31298    0          0.50/s
  CPU  ALL7        0      0          0.00/s

copp packet-type cir trap-action [{trap|copy}]

Section titled “copp packet-type cir trap-action [{trap|copy}]”

[Command] copp packet-type packet_type cir value trap-action [{trap|copy}]

[Purpose] Configure the rate limit for protocol packets sent to the CPU

[Parameter]

ParameterDescription
packet_typeProtocol packet types
valueValue range: 125-10000, unit: pps
trapSend only to the CPU
copySend to the CPU and forward

[View] System configuration view

[Notes] All protocol messages requiring transmission to the CPU have default rate limits. Unless there are specific requirements, it is not recommended to modify them. Excessive rate limits may fill the CPU processing channel with the current protocol messages, preventing protocol messages mapped to other queues from being transmitted to the CPU.

[Use Cases]

sonic(config)# copp packet-type dhcp cir 5000 trap-action copy