Cisco Catalyst 3750-E Software Configuration Manual page 729

Chapter 30 Configuring SPAN and RSPAN
Source Ports
A source port (also called a monitored port) is a switched or routed port that you monitor for network
traffic analysis. In a local SPAN session or RSPAN source session, you can monitor source ports or
VLANs for traffic in one or both directions. The switch supports any number of source ports (up to the
maximum number of available ports on the switch) and any number of source VLANs (up to the
maximum number of VLANs supported). However, the switch supports a maximum of two sessions
(local or RSPAN) with source ports or VLANs, and the Catalyst 3560E-12D switch supports only one
session (local or RSPAN) with source ports or VLANs. You cannot mix ports and VLANs in a single
session.
A source port has these characteristics:
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Source VLANs
VLAN-based SPAN (VSPAN) is the monitoring of the network traffic in one or more VLANs. The SPAN
or RSPAN source interface in VSPAN is a VLAN ID, and traffic is monitored on all the ports for that
VLAN.
VSPAN has these characteristics:
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It can be monitored in multiple SPAN sessions on a switch. The source port can only be monitored
in one SPAN session on the Catalyst 3560E-12D switch.
Each source port can be configured with a direction (ingress, egress, or both) to monitor.
It can be any port type (for example, EtherChannel, Gigabit Ethernet, and so forth).
For EtherChannel sources, you can monitor traffic for the entire EtherChannel or individually on a
physical port as it participates in the port channel.
It can be an access port, trunk port, routed port, or voice VLAN port.
It cannot be a destination port.
Source ports can be in the same or different VLANs.
You can monitor multiple source ports in a single session.
All active ports in the source VLAN are included as source ports and can be monitored in either or
both directions.
On a given port, only traffic on the monitored VLAN is sent to the destination port.
If a destination port belongs to a source VLAN, it is excluded from the source list and is not
monitored.
If ports are added to or removed from the source VLANs, the traffic on the source VLAN received
by those ports is added to or removed from the sources being monitored.
You cannot use filter VLANs in the same session with VLAN sources.
You can monitor only Ethernet VLANs.
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
Understanding SPAN and RSPAN
30-7