Can an interface be configured as a mirrored port and an observing port at the same time

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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.

Other related questions:
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 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.

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.

Do S series switches support N:1 or 1:N mirroring
S series switches all support N:1 mirroring, in which packets are copied from N mirrored ports to one observing port, and there is no limit on the number specified by N. 1:N mirroring copies packets on one mirrored port to N observing ports. M:N mirroring copies packets on M mirrored ports to N observing ports. In M:N mirroring, the number of mirrored ports is not limited, and the number of observing ports is the same as that in 1:N mirroring. The observing ports supported by S series switches are different. For details, see: - S1720&S2700&S5700&S6720 series switches 1:N Mirroring Specifications - S7700&S9700 series switches 1:N Mirroring Specifications - S12700 series switches 1:N Mirroring Specifications - S9300&S9300E&S9300X series switches 1:N Mirroring Specifications

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

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