Cisco Systems 3750E manual Local Span, 30-2

Chapter 30 Configuring SPAN and RSPAN

Understanding SPAN and RSPAN

These sections contain this conceptual information:

•Local SPAN, page 30-2

•Remote SPAN, page 30-3

•SPAN and RSPAN Concepts and Terminology, page 30-4

•SPAN and RSPAN Interaction with Other Features, page 30-9

•SPAN and RSPAN and Switch Stacks, page 30-10

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 or switch stack. 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 Figure 30-1, all traffic on port 5 (the source port) is mirrored to port 10 (the destination port). A network analyzer on port 10 receives all network traffic from port 5 without being physically attached to port 5.

Figure 30-1 Example of Local SPAN Configuration on a Single Switch

Port 5 traffic mirrored

1 2 3 4 5 6 7 8 9 10 11 12 on Port 10

6	7	11
5	8
4	9	12
3		10

2

1

Network analyzer 43580

Figure 30-2is an example of a local SPAN in a switch stack, where the source and destination ports reside on different stack members.

Catalyst 3750-E and 3560-E Switch Software Configuration Guide

30-2 OL-9775-02