About CPU Limit
The CPU limit feature controls the rate at which packets are routed to the CPU to improve CPU performance. You can limit the rate of packets routed to the CPU by configuring a limit based on the type of packet.
Configuring CPU Limit
How to Configure CPU Limit
Configuring CPU Limit
To configure CPU limit, perform this procedure.
SUMMARY STEPS
- enable
- configure terminal
- [no] cpu-limit {arp | bpdu | broadcast | dhcp | icmp | igmp | mld | ospf | other | rip | snmp | ssh | switch-dst-mac | telnet } rate
DETAILED STEPS
| Command or Action | Purpose | |
|---|---|---|
|
Step 1 |
enable Example: |
Enables privileged EXEC mode. Enter your password if prompted. |
|
Step 2 |
configure terminal Example: |
Enters global configuration mode. |
|
Step 3 |
[no] cpu-limit {arp | bpdu | broadcast | dhcp | icmp | igmp | mld | ospf | other | rip | snmp | ssh | switch-dst-mac | telnet } rate Example: |
(Optional) Allows packets within the specified CPU-limit rate for the specified packet type. rate : The range is 1 to 10000 packets per second. Use the no cpu-limit command to restore the default value. |
Monitoring CPU Limit
The commands in the following table can be used to monitor CPU performance.
|
Command |
Purpose |
|---|---|
|
show cpu-limit |
Displays the packet types and the speed for each packet type. |
|
show cpu-utilization |
Displays CPU utilization. |
Example: Configuring CPU Limit
The following example shows how to configure the CPU limit of ARP packets to 100pps.
Device> enable
Device# configure terminal
Device(config)# cpu-limit arp 100The following example shows the sample ouput of the show cpu-limit command.
Device> enable
Device# show cpu-limit
packet-type speed(pps)
other 200
broadcast 200
switch-dst-mac 1000
icmp 200
mld 200
igmp 200
ssh 200
dhcp 200
snmp 100
arp 100
ospf 200
rip 200
telnet 100
bpdu 200
The following example shows the sample ouput of the show cpu-utilization command.
Device> enable
Device# show cpu-utilization
CPU Information:
CPU Idle : 82 %
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