If mirroring is configured on the main interface, will the traffic of the sub-interface be mirrored to the observing port

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Yes, the traffic of the sub-interface will be mirrored to the observing port

Other related questions:
If mirroring is configured on the main interface, will traffic of its sub-interface be mirrored
If mirroring is configured on the main interface, traffic of its sub-interface will be mirrored.

Can an interface be configured as a mirrored port and an observing port at the same time
An interface cannot be configured as a mirroring port and an observing port at the same time. This is because the mirroring port and the observing port are exclusive.

Can packets on multiple interfaces be mirrored to one observing port on AR routers and how many interfaces can be mirrored
Multiple interfaces can be mirrored to one observing port on AR routers. There is no limit for the number of interfaces that can be mirrored to one observing port. You need to consider whether actual traffic of the observing port is larger than its forwarding capacity, that is, whether the actual traffic is larger than the maximum bandwidth of the observing port.

Can a physical port on an S series switch be configured as a mirrored port and an observing port simultaneously
For S series switches (except S1700 switches), a port on the following switch models or cards cannot be configured as an observing port and a mirrored port simultaneously: - Modular switches: X series cards - Fixed switches: S5720HI Note: A port on the following switches cannot be configured as an observing port and a mirrored port simultaneously: S1720GFR, S1720GW-E, S1720GWR-E, S2720EI, S2750EI, S5700LI, S5700S-LI, S5710-C-LI, S5710-X-LI, S5700SI, S5720LI, S5720S-LI, S5720SI, S5720S-SI, and S600-E.

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