Configuring Port Mirroring
By configuring port mirroring, you can copy the traffic on a specified mirroring port to an observing port for analysis. In this manner, you can know the status of the traffic passing through the mirroring port.
Usage Scenario
When a network router and the router are connected directly, and traffic on interfaces of the network router need to be observed and analyzed, port mirroring can be enabled on the router to mirror traffic on interfaces of the network device to a specific packet analyzer. In this manner, you do not have to analyze packets on the interfaces of the network router.
To enable port mirroring, configure observing ports, mirrored ports, and specify an observing port for a line processing unit or an interface. If you no longer use port mirroring, disable it to avoid affecting user services.
- Configuring an Observing Port
- An observing port copies the traffic on the mirroring port to a packet analyzer. To prevent adverse impacts on running services, do not use the observing port as a service port.
- Configuring a Mirrored Port
- To analyze traffic sent or received on an interface, configure this interface as a mirrored port.
- Specifying an Observing Port
- This section describes how to specify an observing port to associate the observing and mirrored ports.
- (Optional) Configuring the CAR Function for Mirrored Traffic
- This section describes how to configure the committed access rate (CAR) function for mirrored traffic to prevent a large amount of mirrored traffic from affecting packet processing.
- (Optional) Configuring the Function of Mirroring Packet Content of a Specified Length
- Specify the length of packet content to be mirrored to reduce the bandwidth to be consumed by the observing port and improve service performance.
- (Optional) Configuring the Mirroring Statistics Function
- You can configure the mirroring statistics function to monitor mirrored packet information.
- Verifying the Port Mirroring Configuration
- After local port mirroring is configured, you can view the configurations of the mirrored port, observing port, index of the observing port, and observing port applied on the interface board.
- Disabling Port Mirroring
- Port mirroring needs to be disabled if it is no longer used; otherwise, user services are affected.