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The first packet logged via the log or log-input options will generate a syslog message. The log-input option enables logging of the ingress interface and source MAC address in addition to the packet's source and destination IP addresses and ports.

The log and log-input options apply to an individual ACE and cause packets that match the ACE to be logged.

Using the configuration commands detailed in this document, administrators can strike a balance between traffic visibility and the corresponding impact on device CPU load. There are two primary factors that contribute to the CPU load increase from ACL logging: process switching of packets that match log-enabled access control entries (ACEs) and the generation and transmission of log messages. Unfortunately, ACL logging can be CPU intensive and can negatively affect other functions of the network device.

Logging-enabled access control lists (ACLs) provide insight into traffic as it traverses the network or is dropped by network devices. Limiting ACL Logging–Induced Process Switching The log and log-input Access Control Entry Options

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