Remote Span - Cisco Catalyst 3750-E Software Configuration Manual

Chapter 30 Configuring SPAN and RSPAN
Figure 30-2
reside on different stack members.
Figure 30-2
Stackwise Plus

Remote SPAN

RSPAN supports source ports, source VLANs, and destination ports on different switches (or different
switch stacks), enabling remote monitoring of multiple switches across your network.
source ports on Switch 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.
OL-9775-08
is an example of a local SPAN in a switch stack, where the source and destination ports
Example of Local SPAN Configuration on a Switch Stack
Switch stack
port
connections
Switch 1
1/0/4
Port 4 on switch 1 in the stack Port 4 on switch 1 in the stack Port 4 on switch 1 in the stack
mirrored on port 15 on switch 2 mirrored on port 15 on switch 2 mirrored on port 15 on switch 2
2/0/15
Switch 2
Switch 3
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
Understanding SPAN and RSPAN
Network
analyzer
Figure 30-3 shows
30-3