Span And Rspan Concepts And Terminology; Span Sessions - Cisco Catalyst 3750-E Software Configuration Manual

Understanding SPAN and RSPAN
Figure 30-3
must support RSPAN VLAN
Switch A

SPAN and RSPAN Concepts and Terminology

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SPAN Sessions

SPAN sessions (local or remote) allow you to monitor traffic on one or more ports, or one or more
VLANs, and send the monitored traffic to one or more destination ports.
A local SPAN session is an association of a destination port with source ports or source VLANs, all on
a single network device. Local SPAN does not have separate source and destination sessions. Local
SPAN sessions gather a set of ingress and egress packets specified by the user and form them into a
stream of SPAN data, which is directed to the destination port.
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
30-4
Example of RSPAN Configuration
destination ports
Switch C
Intermediate switches
RSPAN
source
session A
RSPAN
source ports
SPAN Sessions, page 30-4
Monitored Traffic, page 30-6
Source Ports, page 30-7
Source VLANs, page 30-7
VLAN Filtering, page 30-8
Destination Port, page 30-8
RSPAN VLAN, page 30-9
RSPAN
RSPAN
destination
session
RSPAN
VLAN
Switch B
RSPAN
source ports
Chapter 30 Configuring SPAN and RSPAN
RSPAN
source
session B
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