Configuring Flow Mirroring
By configuring flow mirroring, you can copy the traffic of a specified type on the mirrored interface to the observing port for analysis. In this manner, you can know the status of the traffic of the specified type on the mirrored interface.
Usage Scenario
When refined control is required for the packets sent to the analyzer, you can use both port mirroring and traffic classification. In this manner, only the packets that meet the specific conditions are copied and the other packets are filtered out. Thus, the efficiency of the packet analyzer is improved.
The tasks of configuring the observing port, configuring the observing port for mirroring of the entire interface board, and applying a traffic policy on the mirroring port are not listed in sequence. They can be configured in a random order but must be all configured; otherwise, port mirroring cannot take effect. Disabling the mirroring function is recommended if this function is no longer used; otherwise, user services are affected.
- 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.
- Defining a Traffic Policy for Mirrored Traffic
- Configure a traffic classifier to define flows to be mirrored, configure a traffic behavior as enabling flow mirroring, and associate the traffic classifier with traffic behavior in a traffic policy.
- Applying the Traffic Policy to the Mirroring Port
- After being created, the traffic policy must be applied on an interface. The configured traffic behaviors take effect only after the traffic passing through the interface matches the traffic classification rule.
- Specifying an Observing Port
- This section describes how to specify an observing port to associate the observing and mirrored ports.
- (Optional) Configuring the Mirroring Statistics Function
- You can configure the mirroring statistics function to monitor mirrored packet information.
- Verifying the Flow Mirroring Configuration
- After configuring local flow mirroring, you can view the configurations of traffic classification, traffic behavior, traffic policy, and port mirroring.
- Disabling Flow Mirroring
- Flow mirroring needs to be disabled if it is no longer used; otherwise, user services are affected.