Whether the observing port and the mirroring port of the S-series switch need to be added to the same VLAN

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For S-series switches, mirroring ports and observing ports do not need to be added to the same VLAN when configuring port mirroring. You can run command observe-port to forward mirrored traffic to the local or remote, do not need to add observe the port the VLAN.

Other related questions:
Do observing ports and mirrored ports on S series switches need to have the same bandwidth
For S series switches, if a mirrored port and an observing port provide different bandwidth, for example, 1000 Mbit/s on the mirrored port and 100 Mbit/s on the observing port, the observing port may fail to forward all mirrored packets in a timely manner because of insufficient bandwidth, leading to packet loss. Therefore, ensure that the bandwidth of an observing port is larger than that of a mirrored port. The bandwidth of an observing port can also be the total bandwidth of multiple observing ports in 1: N mirroring. For details, see Mirroring �?an Effective Network Monitoring Tool (Specifications).

Do I need to add observing ports and mirrored ports on S series switches to the same VLAN when configuring mirroring
For S series switches, you do not need to add observing ports and mirrored ports to the same VLAN when configuring port mirroring. In addition, the observe-port command has been executed to enable forwarding of mirrored packets to local or remote observing ports. Therefore, you do not need to add the observing ports to a VLAN.

Whether observing-port of S-series switch can distinguish the mirrored traffic of different VLANs
For S-series switches, because the mirrored traffic is copied directly from the original traffic, the traffic mirroring to the observing port is related to whether the port carry the VLAN tag and the direction of mirrored port. - Inbound of mirroring traffic: For the Access port type, because the original traffic do not carry VLAN tag, the mirrored traffic to the observing port do not have VLAN tag; For Trunk type port, because the original traffic carry VLAN tag, the mirrored traffic to the observing port has a VLAN tag too; The hybrid port has both of the above two cases. - Outbound of mirroring traffic: For some switches, the mirroring action occurs before adding / stripping VLAN tags, because the original traffic from the device before the general release with a VLAN tag, the mirror to the observation port has a VLAN tag too; For another Part of the switch, the mirror action occurs after adding / stripping VLAN tags, so whether mirroring to the observing port carry VLAN tag is same as inbound of mirroring traffic style.

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.

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