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Understanding SPAN and RSPAN
These sections contain this conceptual information:
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Local SPAN
Local SPAN supports a SPAN session entirely within one switch; all source ports or source VLANs and
destination ports are in the same switch. Local SPAN copies traffic from one or more source ports in any
VLAN or from one or more VLANs to a destination port for analysis. For example, in
traffic on port 5 (the source port) is mirrored to port 19 (the destination port). A network analyzer on
port 19 receives all network traffic from port 5 without being physically attached to port 5.
Figure 27-1
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Remote SPAN
RSPAN supports source ports, source VLANs, and destination ports on different switches, enabling
remote monitoring of multiple switches across your network.
A and Switch B. The traffic for each RSPAN session is carried over a user-specified RSPAN VLAN that
is dedicated for that RSPAN session in all participating switches. The RSPAN traffic from the source
ports or VLANs is copied into the RSPAN VLAN and forwarded over trunk ports carrying the RSPAN
VLAN to a destination session monitoring the RSPAN VLAN. Each RSPAN source switch must have
either ports or VLANs as RSPAN sources. The destination is always a physical port, as shown on Switch
C in the figure.
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
27-2
Local SPAN, page 27-2
Remote SPAN, page 27-2
SPAN and RSPAN Concepts and Terminology, page 27-3
SPAN and RSPAN Interaction with Other Features, page 27-8
Example of Local SPAN Configuration on a Single Switch
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Network analyzer
Chapter 27
Configuring SPAN and RSPAN
Port 5 traffic
mirrored
18 19
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on Port 19
18 19
20 21 22 23 24
Figure 27-2
shows source ports on Switch
Figure
27-1, all
OL-8915-03
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