Ruijie RG-S2900G-E Series, Configuration Manual

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Configuration Guide SPAN Configuration
port, and AP can be configured as source port and destination port. The SPAN
session does not affect the normal operation of the switch.
You can configure the SPAN session on one disabled port, but the SPAN does
not take effect until you enable the destination and source ports. The show
monitor session session number command allows you to show the operation
status of the SPAN session. One SPAN session does not take effect
immediately after the swtich is powered on until the destination port is active.
Frame Type
The SPAN session includes the following frame types:

Received frames
Received frames include all known unicast frames and routing frames, and
each received frame is copied to the destination port. In one SPAN session, you
can monitor the the frames inputted from one or multiple source ports. Although
a frame inputted from the source port is dropped due to some reasons, for
example, port security, it is still sent to the destination port. This does not affect
the function of the SPAN.

Transmitted frames
All the frames sent from the source port are copied to the destination port. In
one SPAN session, you can monitor the frames input from one or multiple
source ports. If a frame from a port to the source port is dropped due to some
reasons, the frame will not be sent to the destination port as well. Moreover, the
format of the frames destined to the source port may change, for example,
routed frames, source MAC address, destination MAC address, VLAN ID and
TTL. Similarly, the format of the frames copied to the destination port will
change.

Bi-directional frames
Bi-directional frames include the above mentioned two frames. In one SPAN
session, you can monitor the frames received and transmitted from/to one or
multiple source ports.
Source Port
A source port (also known as monitored interface) is a switched port or routed
port monitored for network analysis. In one SPAN session, you can monitor
received, transmitted and bi-directional frames. There is no limit on the
maximum number of the source ports.
A source port has the following features:

It can be a switched port, routed port or AP.

It cannot be a destination port at the same time.