Port Mirroring Considerations and Restrictions

Although you can configure the switch to monitor both ingress and egress traffic, some restrictions apply:

Port Mirroring Resources

Port mirroring resources are limited to four ports simultaneously (where each mirroring direction counts as one). For example, if two mirroring ports are designated to mirror both ingress and egress traffic then all four mirroring ports are consumed.

Port mirroring shares these four resources with other applications such as port mirroring RSPAN, Fabric Extend, Application Telemetry, IPFIX, and ACL with mirror action. Each one of these applications consumes at least one port mirroring resource. (port mirroring RSPAN consumes two if you configure both Ingress and Egress modes.)
Important

Important

To enable any one of the preceding applications, you must have at least one free mirroring resource. If all four port mirroring resources are already in use, the switch displays a Resource not available error message when you try to enable the application.

If you receive a Resource not available error message, you can use the show mirror-resources command to view information about mirror resource usage. For more information, see Display Mirror Resource Usage.