Can packets on multiple interfaces be mirrored to one observing port on AR routers and how many interfaces can be mirrored

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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.

Other related questions:
How many ports can mirror traffic to one observing port
AR series routers allow multiple ports to mirror traffic to one observing port. There is no limit to the number of ports. The traffic mirrored to the observing port, however, cannot exceed the maximum forwarding traffic of the observing port, namely, maximum bandwidth of the observing port.

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

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.

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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