Differences between mirrored ports and observing ports on S series switches

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For S series switches:
- A mirrored port is a monitored port. All the packets that pass through a mirrored port are copied to a port connected to a monitoring device.
- An observing port is connected to a monitoring device and used to send packets from a mirrored port to the monitoring device.

Other related questions:
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 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).

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.

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

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

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