Ruijie RG-S2900G-E Series, Configuration Manual

Page: 879 / 943

Configuration Guide SPAN Configuration
SPAN Configuration
Overview
With SPAN, you can analyze the communications between ports by copying a
frame from one port to another port connected with a network analysis device or
RMON analyzer. The SPAN mirrors all the packets sent/received at a port to a
physical port for analysis.
For example, all the frames on the GigabitEhternet port 5 are mirrored to the
GigabitEhternet port 10, as shown in Figure 18-1. Although the network
analyzer connected to port 10 is not directly connected to port 5, it can receive
all the frames from port 5.
Figure 1-1 SPAN Configuration Example
The SPAN allows you to monitor all the frames incoming/outgoing the source
port, including the route input frames.
The SPAN does not affect the normal packet switching of the switch. Instead, it
copies the frames incoming/outgoing the source port to the destination port.
However, the frames may be discarded on an overflowed destination port, for
example, when an 100Mbps port monitors an 1000Mbps port.
SPAN Concepts and Terms
This section describes the concepts and terms related to SPAN configuration.
SPAN Session
One SPAN session is the combination of one destination port and source port.
You can monitor the inbounding, outbounding, and bi-directional frames of one
or multiple interfaces.
You can set up one or multiple SPAN sessions. Switched port and routed port
can be configured with only one SPAN session. However, switched port, routed