Span Concepts And Terms; Span Session; Frame Type - D-Link xStack DGS-3610 Series Configuration Manual

Chapter 18 SPAN Configuration
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18.2 SPAN Concepts and Terms

This section describes the concepts and terms related to SPAN configuration.
18.2.1

SPAN Session

One SPAN session is the combination of one destination port and source port. You can
monitor the input, output, and bi-directional frames of single or multiple interfaces.
You can only configure one SPAN sessions. Switched port, routed 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 shows the operation status of the SPAN session. One SPAN
session does not take effect immediately after power-on, but until the destination port
becomes operable.
18.2.2

Frame Type

The SPAN session includes the following frame types:
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Received frames
Each received frame is copied to the destination port. In one SPAN session, you can monitor
the input frames of one or multiple source ports. The inputted frames from the source port
may be discarded due to some reasons, for example, port security, but this does not affect
the function of the SPAN, and the frames are still sent to the destination port.
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Transmitted frames
All transmitted frames from the source port will be copied to the destination port. In one
SPAN session, you can monitor the input frames of one or multiple source ports. The
inputted frames to the source port from other ports may be discarded due to some reasons,
This frame couldn't be sent to the destination port..The format of frames sent to the source
port may be changed. For example, the frame pass through routing output from the source
port, the source MAC of the frame, destination MAC, VLAN ID and TTL will be changed.
Similarly, the format of the frame copied to the destination port may be changed.
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Bi-directional frames
It includes the two types of frames mentioned above. In one SPAN session, you can monitor
the input and output frames of one or multiple source ports.
18-2
couldn't be mirrored to the mirroring destination port (that is to say that the tx
direction is not effective configured on the mirroring source port).
For DGS-3610 series, SPAN supports the enabled mirroring destination port and
allows the switching function.
DGS-3610 Series Configuration Guide