D-Link DGS-1510-20 User Manual - Page 526
Command Default Level, Usage Guideline, Example, 4 cpu-protect type, Parameters, Default, Command
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DGS-1510 Series Gigabit Ethernet SmartPro Switch CLI Reference Guide Global Configuration Mode. Command Default Level Level: 12. Usage Guideline The reasons of packets that are destined to the CPU can be classified into three groups: manage, protocol and route. The sub-interface is a logical interface, which handles the CPU received packets by different groups. Generally speaking, the protocol packets should have higher priority to make sure the functions work normally. The CPU usually is not involved in the routing of packets. In few cases, such as learning new IP address or if the default route is not specified, some packets will be sent to the CPU for software routing. Use this command to limit the rate of routed packets to avoid the CPU spending too much time for routing packets. Example This example shows how to configure the rate limit of packets for the management sub-interface and the threshold is 1000 packets per seconds. Switch# configure terminal Switch(config)# cpu-protect sub-interface manage pps 1000 Switch(config)# 57-4 cpu-protect type This command is used to configure the rate limit of traffic destined to the CPU by the protocol type. cpu-protect type PROTOCOL-NAME pps RATE no cpu-protect type PROTOCOL-NAME Parameters PROTOCOL-NAME RATE Specifies the protocol name to be configured. Specifies the threshold value. The unit is packets per second. When set to 0, all packets of the specified protocol are dropped. Default None. Command Mode Global Configuration Mode. Command Default Level Level: 12. Usage Guideline The CPU must handle certain packets, such as routing protocols, Layer 2 protocols, and packets for management. If the traffic destined to the CPU overloads it, the CPU will spend much time processing unnecessary traffic and the routing processes are impacted. To mitigate the impact on the CPU, use this command to control the threshold of individual protocol packets. The following lists the reference for the supported protocols for the CPU protect type command. According to the purpose of packets destined to CPU, the router creates three virtual sub-interfaces to process the packets: 523
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